Papers - OTA Hiroki
about 91-
Clinical evaluation of the installation conditions and accuracy of wearable neonatal jaundice meter
Uozumi, A; Ohara, I; Shimamura, M; Iwama, K; Fukuyama, A; Horiguchi, H; Isoda, Y; Kimura, F; Ota, H … Show more authors
Uozumi, A; Ohara, I; Shimamura, M; Iwama, K; Fukuyama, A; Horiguchi, H; Isoda, Y; Kimura, F; Ota, H; Ito, S Hide authors
SCIENTIFIC REPORTS 15 ( 1 ) 2025.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Direct Physical Vapor Deposition of Liquid Metal on Treated Metal Surface
Matsuda, R; Isano, Y; Onishi, K; Ota, H; Inoue, F
ACS APPLIED ELECTRONIC MATERIALS 2025.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Stretchable composites with electrical conductivity
Matsuda, R; Isano, Y; Ota, H
FLEXIBLE AND PRINTED ELECTRONICS 10 ( 1 ) 2025.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Soft intelligent systems based on stretchable hybrid devices integrated with machine learning
1. Y. Isano, M. Takaya, Y. Kurotaki, R. Matsuda, Y. Miyake, T. Takano, Y. Isoda, T. Hamagami, K. Ku … Show more authors
1. Y. Isano, M. Takaya, Y. Kurotaki, R. Matsuda, Y. Miyake, T. Takano, Y. Isoda, T. Hamagami, K. Kuribayashi, H. Ota Hide authors
Device 2 ( 9 ) 100496 2024.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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H. Kawakami, K. Nagatake, S. Ni, F. Nakamura, T. Takano, K. Murakami, I. Ohara, Y. Isano, R. Matsud … Show more authors
H. Kawakami, K. Nagatake, S. Ni, F. Nakamura, T. Takano, K. Murakami, I. Ohara, Y. Isano, R. Matsuda, H. Suwa, R. Higashi, M. Kanto, M. Saito, H. Fujita, T. Araki, S. Ozaki, K. Ueno, T. Horii, T. Fujie, H. Ota Hide authors
Advanced Materials Technologies 9 ( 17 ) 2400487 2024.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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Liquid Metal Electrode Ink for Printable Lithium-Ion Batteries
3. Y. Ozawa, Y. Nishitai, N. Ochirkhuyag, N. Usami, M. Kanto, K. Ueno, and Hiroki Ota
Advanced Engineering Materials 26 ( 11 ) 2400529 2024.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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Inoue, K; Miwa, K; Shimizu, S; Ueno, K; Ohe, J; Ono, S; Ota, H
2024 IEEE 37TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS, MEMS 604 - 605 2024
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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ALL-PRINTING FABRICATION FOR STRETCHABLE DEVICES BASED ON R2R PROCESSES
Nagatake, K; Kawakami, H; Ni, S; Nakamura, F; Takano, T; Ohara, I; Matsuda, R; Horii, T; Fujie, T; … Show more authors
Nagatake, K; Kawakami, H; Ni, S; Nakamura, F; Takano, T; Ohara, I; Matsuda, R; Horii, T; Fujie, T; Ota, H Hide authors
2024 IEEE 37TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS, MEMS 681 - 682 2024
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Motion Recognition System Based on Hard-Soft Hybrid Stretchable Devices and Machine Learning
Isano Yuji, Takaya Maika, Kurotaki Yuta, Matsuda Ryosuke, Miyake Yusuke, Takano Tamami, Isoda Yutak … Show more authors
Isano Yuji, Takaya Maika, Kurotaki Yuta, Matsuda Ryosuke, Miyake Yusuke, Takano Tamami, Isoda Yutaka, Hamagami Tomoki, Kuribayashi Kentaro, Ota Hiroki Hide authors
The Proceedings of Mechanical Engineering Congress, Japan 2024 ( 0 ) J224-03 2024
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
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Challenges in developing a wearable device for rats to contribute to toxicology research
TOCHINAI Ryota, OKUBO Yusuke, MA Min, TAKANO Tamami, KOJIMA Shunpei, OHARA Ibuki, NISHIMURA Takuya, … Show more authors
TOCHINAI Ryota, OKUBO Yusuke, MA Min, TAKANO Tamami, KOJIMA Shunpei, OHARA Ibuki, NISHIMURA Takuya, TAQUAHASHI Yuhji, KITAJIMA Satoshi, HIRABAYASHI Yoko, SEKIZAWA Shin-ichi, KUWAHARA Masayoshi, OTA Hiroki Hide authors
Annual Meeting of the Japanese Society of Toxicology 51.1 ( 0 ) P-172 2024
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Toxicology Joint Work
<p>Vital signs (VS) analysis provides important information for toxicological research. However, VS analysis in rodents has faced challenges in terms of invasiveness, throughput, and the need for anesthesia. Against this background, we have developed a wearable device (WD) that can minimally invasively acquire multiple VS from rats. In this meeting, we report on the progress made in body movement analysis and the noise processing method of pulse oximeter function caused by body movement.</p><p></p><p>We installed an acceleration sensor in our WD (pulse oximeter + thermometer). A threshold value of synthetic acceleration was set to distinguish between resting and active states. We also added an acceleration analysis program that recognizes body movement noise and completes data when noise is detected. The WD was attached to rats implanted with a telemetry transmitter, and dosing experiments were conducted to compare the analysis results of heart rate and activity level obtained from the WD and telemetry system.</p><p></p><p>The noise processing method improved the correlation between the results of heart rate analysis by WD and the telemetry. The correlation of activity analysis was slightly lower, but this is because the telemetry uses the signal strength of the radio wave used for data transmission as an indicator of body movement, whereas the WD uses acceleration, i.e., the movement itself. It was confirmed that the WD can detect increases or decreases in heart rate and activity induced by dosing, and it was thought that the WD can realize more accurate VS analysis of rats for toxicological research.</p>
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Self-assembling bilayer wiring with highly conductive liquid metal and insulative ion gel layers
Murakami Koki, Isano Yuji, Asada Juri, Usami Natsuka, Isoda Yutaka, Takano Tamami, Matsuda Ryosuke, … Show more authors
Murakami Koki, Isano Yuji, Asada Juri, Usami Natsuka, Isoda Yutaka, Takano Tamami, Matsuda Ryosuke, Ueno Kazuhide, Fuchiwaki Ohmi, Ota Hiroki Hide authors
SCIENTIFIC REPORTS 13 ( 1 ) 2023.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Matsuda R., Isano Y., Ueno K., Ota H.
APL BIOENGINEERING 7 ( 1 ) 2023.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Biphasic liquid metal mixtures in stretchable and flexible applications
Nyamjargal Ochirkhuyag, Yuji Isano, Kota Inoue and Hiroki Ota
Sensors & Diagnostics 2 ( 2 ) 290 - 306 2023.2 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Single Work
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Development of a wearable device for monitoring multiple vital signs and activity in conscious and unrestrained rats
KOJIMA Shunpei, OHARA Ibuki, TAKANO Tamami, ISODA Yutaka, MA Min, TOCHINAI Ryota, OKUBO Yusuke, TAK … Show more authors
KOJIMA Shunpei, OHARA Ibuki, TAKANO Tamami, ISODA Yutaka, MA Min, TOCHINAI Ryota, OKUBO Yusuke, TAKAHASHI Yuji, OTA Hiroki Hide authors
Annual Meeting of the Japanese Society of Toxicology 50.1 ( 0 ) P1-109S 2023
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Toxicology Joint Work
<p>In toxicity studies, one of the core endpoints is observation of clinical symptoms including vital signs (VSs). Measurement of VSs has already been realized in safety pharmacology in drug development, but not in toxicity studies on chemical substances. We believe that VSs monitoring in easy-to-use approach can achieve both refinement and reduction in toxicity studies. In the past, we have developed a wearable device for rats (WDr) and achieved measurement of VSs (pulse rate, SpO2, respiratory rate, and body temperature) from a conscious and unrestrained rat over time at low cost (JSOT 2022). For further improvement of the accuracy of toxicity assessment, we attempted to reduce the weight of the WDr, build a program to cope with body motion noise, and evaluate the activity. By redesigning the sensor arrangement and circuitry from the conventional WDr, the weight was reduced by 47% while mounting an additional 6-axis sensor. In addition, we developed an analysis program that recognized abnormal changes in pulse waveforms due to body motion and artifacts and excluded them from the analysis. We orally administered chemicals to rats wearing the WDr and confirmed their pharmacological effects and the recovery process. The results showed that changes in VSs induced by these chemicals could be detected more accurately. Furthermore, we succeeded in obtaining the amount of activity of the animals from the acceleration data. In the future, we aim to achieve both further refinement of toxicity evaluation and reduction in the number of test animals and costs.</p>
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Electro-Powerless Balloon Soft Actuator with Manually Driven Fluidic Circuit
Matsuda Ryosuke, Song Zihao, Ota Hiroki
ADVANCED ELECTRONIC MATERIALS 9 ( 3 ) 2022.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Stretchable Gas Barrier Films Using Liquid Metal toward a Highly Deformable Battery
Nyamjargal Ochirkhuyag, Yuuki Nishitai, Satoru Mizuguchi, Yuji Isano, Sijie Ni, Koki Murakami, Masa … Show more authors
Nyamjargal Ochirkhuyag, Yuuki Nishitai, Satoru Mizuguchi, Yuji Isano, Sijie Ni, Koki Murakami, Masaki Shimamura, Hiroki Iida, Kazuhide Ueno, Hiroki Ota Hide authors
ACS Applied Materials & Interfaces 14 ( 42 ) 48123 - 48132 2022.9 [Reviewed]
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Single Work
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特集 周産期と最先端サイエンス 新生児領域 経皮ビリルビン測定が可能なウェアラブル型マルチバイタルデバイスの開発
魚住 梓, 嶋村 雅貴, 太田 裕貴, 伊藤 秀一
周産期医学 52 ( 7 ) 1013 - 1017 2022.7
Language：The in addition, foreign language Publishing type：Research paper (scientific journal) Publisher：東京医学社 Joint Work
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Transparent and Breathable Temperature/Humidity Sensor using Ion Gel and Elastomer Nanosheet
Isano Yuji, Fujita Hajime, Ueno Kazuhide, Fujie Toshinori, Ota Hiroki
IEEJ Transactions on Sensors and Micromachines 142 ( 7 ) 168 - 169 2022.7 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan Joint Work
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Transparent and Breathable Ion Gel-Based Sensors toward Multimodal Sensing Ability
Isano Yuji, Fujita Hajime, Murakami Koki, Ni Sijie, Kurotaki Yuta, Takano Tamami, Isoda Yutaka, Mat … Show more authors
Isano Yuji, Fujita Hajime, Murakami Koki, Ni Sijie, Kurotaki Yuta, Takano Tamami, Isoda Yutaka, Matsuda Ryosuke, Nakamura Fumika, Nishitai Yuuki, Ochirkhuyag Nyamjargal, Inoue Kota, Kawakami Hiroki, Okubo Yusuke, Ueno Kazuhide, Fujie Toshinori, Ota Hiroki Hide authors
ADVANCED MATERIALS TECHNOLOGIES 7 ( 11 ) 2022.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Direct Wiring of Liquid Metal on an Ultrasoft Substrate Using a Polyvinyl Alcohol Lift-off Method
Murakami Koki, Tochinai Ryota, Tachibana Daiki, Isano Yuji, Matsuda Ryosuke, Nakamura Fumika, Kurot … Show more authors
Murakami Koki, Tochinai Ryota, Tachibana Daiki, Isano Yuji, Matsuda Ryosuke, Nakamura Fumika, Kurotaki Yuta, Isoda Yutaka, Yamane Monami, Sugita Yuya, Fukuda Junji, Ueno Kazuhide, Miki Norihisa, Fuchiwaki Ohmi, Ota Hiroki Hide authors
ACS APPLIED MATERIALS & INTERFACES 14 ( 5 ) 7241 - 7251 2022.1 [Reviewed]
DOI Web of Science Scopus PubMed
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Tachibana Daiki, Murakami Koki, Kozaki Takashi, Matsuda Ryosuke, Isoda Yutaka, Nakamura Fumika, Isa … Show more authors
Tachibana Daiki, Murakami Koki, Kozaki Takashi, Matsuda Ryosuke, Isoda Yutaka, Nakamura Fumika, Isano Yuji, Ueno Kazuhide, Fuchiwaki Ohmi, Ota Hiroki Hide authors
ADVANCED INTELLIGENT SYSTEMS 4 ( 5 ) 2100212 2022.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley Joint Work
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Stretchable Micro-devices towards Digital Transformation
OTA Hiroki
The Proceedings of Mechanical Engineering Congress, Japan 2022 ( 0 ) F221-03 2022
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Single Work
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Transparent, Breathable Temperature and Humidity Sensor using Ion Gel and Polymer Thin Films
Isano Yuji, Fujita Hajime, Murakami Koki, Ni Sijie, Kurotaki Yuta, Takano Tamami, Isoda Yutaka, Mat … Show more authors
Isano Yuji, Fujita Hajime, Murakami Koki, Ni Sijie, Kurotaki Yuta, Takano Tamami, Isoda Yutaka, Matsuda Ryosuke, Nakamura Fumika, Nishitai Yuuki, Nyamjargal Ochirkhuyag, Inoue Kota, Kawakami Hiroki, Okubo Yusuke, Ueno Kazuhide, Fujie Toshinori, Ota Hiroki Hide authors
The Proceedings of Mechanical Engineering Congress, Japan 2022 ( 0 ) J221-03 2022
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
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Development of Roll-to-Roll Manufacture Process for Stretchable Device Substrate
KAWAKAMI Hiroki, NI Sijue, NAKAMURA Fumika, HORII Tatsuhiro, FUJIE Toshinori, OTA Hiroki
The Proceedings of Mechanical Engineering Congress, Japan 2022 ( 0 ) J131p-04 2022
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
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マルチバイタル計測に向けた新生児用ウェアラブルデバイスの開発
嶋村 雅貴, 稲森 剛, 嘉本 海大, 磯田 豊, 魚住 梓, 伊藤 秀一, 大久保 佑亮, 太田 裕貴
生体医工学 Annual60 ( Abstract ) 196_1 - 196_1 2022
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人 日本生体医工学会 Joint Work
<p>新生児黄疸は生後1週間以内に新生児の80％以上で発症する。その原因は生理的な高ビリルビン血症であり、重度の場合は脳障害を引き起こす可能性がある。これは核黄疸として知られており、これを防ぐためには光線治療法が必要である。光線治療法では治療実施基準が生後日数と出生体重によって定められており、日々の定期的なビリルビン濃度計測が不可欠である。実際の医療現場ではビリルビン計測に血液検査と経皮黄疸計の二つが用いられている。血液検査は測定精度が高いが、侵襲的であるため日々の計測に適さない。経皮黄疸計は非侵襲的であるため、新生児への負担は小さい。しかし、医師・看護師が計測を行う必要があり、ビリルビン濃度を継続的に測ることができない。さらに新生児医療現場ではビリルビン計測と同様に、脈拍数と動脈酸素飽和度(SpO2の計測においても課題がある。これらは有線のケーブルを用いて、手もしくは足にデバイスを装着して計測される。そのため、新生児の動きによって大きな誤差が生じる。以上の背景から、新生児の額からビリルビン濃度・脈拍数・SpO2の3つを計測できるウェアラブルデバイスを開発した。計測には四種類のLEDを用いており、額に照射し戻ってきた光を検知することで測定ができる。ビリルビン濃度・脈拍数・SpO2の計測を連動させたマルチバイタルデバイスの開発は，新生児医療現場における治療を最適化できると考えられる。</p>
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Development of a wearable device for monitoring multiple vital signs in conscious and unrestrained rats
KOJIMA Shunpei, TOCHINAI Ryota, OKUBO Yusuke, TAKANO Tamami, KUROTAKI Yuta, ISODA Yutaka, TAQUAHASH … Show more authors
KOJIMA Shunpei, TOCHINAI Ryota, OKUBO Yusuke, TAKANO Tamami, KUROTAKI Yuta, ISODA Yutaka, TAQUAHASHI Yuhji, OTA Hiroki Hide authors
Annual Meeting of the Japanese Society of Toxicology 49.1 ( 0 ) P-98S 2022
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Toxicology Joint Work
<p>In toxicological studies, one of the core endpoint is clinical observation including vital signs (VSs). Measurement of VSs has already been realized in safety pharmacology in drug development, but not in toxicity tests on chemical substances. We believe that VSs monitoring in easy-to-use approach can achieve both refinement and reduction in toxicity studies. In present, we have now developed some WDs for rats to monitor quantitative VS from conscious and unrestrained rats over time. In the development of the WDs for rats, it has been an issue that rats are very small compared with human and their body movements cannot be controlled. We attempted to solve these problems by applying flexible device materials and information processing technology, and developed a pulse oximeter (pulse rate, SpO2, and respiration rate), a thermometer (body temperature), and an accelerometer (body movement) for rats. By incorporating wireless communication using a Bluetooth Low Energy module into the devices, we succeeded in performing wireless and real-time measurements at low cost and low electrical power. In addition, we developed a program to remove data noise by body movement using the accelerometer. We orally administered chemicals to rats wearing the WD, and confirmed their pharmacological effects and the recovery process. The results showed that it is possible to measure multi-VS in rats by a simple method using WD. </p>
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透明・高通気性イオンゲル超薄膜温湿度センサの開発
伊佐野 雄司, 藤田 創, 村上 航輝, 倪 思捷, 黒瀧 悠太, 高野 珠実, 磯田 豊, 松田 涼佑, 中村 史香, 西躰 優希, 井上 航太, 川上 寛樹, 大久保 佑亮, 上野 和英, 藤枝 … Show more authors
伊佐野 雄司, 藤田 創, 村上 航輝, 倪 思捷, 黒瀧 悠太, 高野 珠実, 磯田 豊, 松田 涼佑, 中村 史香, 西躰 優希, 井上 航太, 川上 寛樹, 大久保 佑亮, 上野 和英, 藤枝 俊宣, 太田 裕貴 Hide authors
生体医工学 Annual60 ( Abstract ) 210_1 - 210_1 2022
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人 日本生体医工学会 Joint Work
<p>次世代のウェアラブルデバイスとして，柔軟性，透明性，気体透過性といった，既存の硬質デバイスでは実現できない特性を持ったデバイスが注目されている．これらのデバイスに用いられるセンサとして，ポリマー薄膜とナノマテリアルを用いた薄膜センサが数多く開発されている．しかし，こうしたセンサに用いられるナノ材料は測定対象の選択性が低く，対象の拡張も難しいという欠点を抱えている．こうした課題を解決できる新たなセンシング材料として，イオン液体が注目されている．イオン液体は常温で液体の塩であり，アニオンとカチオンの組み合わせによって様々な特性を示す．そこで，本研究では親水性の異なる2種のイオン液体とポリマーを組み合わせたイオンゲルをセンシング材料として用いて，透明・高通気性で温湿度の選択的検出が可能な薄膜センサを開発した．センサは生体適合性の高いポリジメチルシロキサン薄膜上に，スプレーコーティングを用いてカーボンナノチューブ電極とイオンゲル感温・感湿部を塗布することで作製した．センサは可視光域で80 %以上の光透過率および人体の経皮水分損失の2.8倍の水蒸気透過量を示した．また，温度と湿度に反応する親水性イオンゲル湿度センサの出力値を温度のみに反応する疎水性イオンゲル温度センサによって校正することで温度と湿度の選択的検出を実現した．今後は，イオン液体とポリマーの変更による薄膜センサの多機能化が期待される．</p>
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Liquid Metal–Ionic Liquid Composite Gels for Soft, Mixed Electronic–Ionic Conductors.
J. Asada, N. Usami, H. Ota, M. Watanabe, and K. Ueno
Macromolecular Chemistry and Physics 223 ( 8 ) 2100319 2021.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley Joint Work
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Stretchable Liquid-State Electronics Using Liquid Metal
ECS Meeting Abstracts MA2021-02 974 2021.10 [Invited]
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings) Single Work
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Liquid-Based Digital Readable Tilt Sensor
Matsuda Ryosuke, Zihao Song, Kamoto Umihiro, Ota Hiroki
ADVANCED MATERIALS TECHNOLOGIES 6 ( 11 ) 2100490-1 - 2100490-9 2021.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley Joint Work
Other Link： https://doi.org/10.1002/admt.202100490
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Inamori Go, Kamoto Umihiro, Nakamura Fumika, Isoda Yutaka, Uozumi Azusa, Matsuda Ryosuke, Shimamura … Show more authors
Inamori Go, Kamoto Umihiro, Nakamura Fumika, Isoda Yutaka, Uozumi Azusa, Matsuda Ryosuke, Shimamura Masaki, Okubo Yusuke, Ito Shuichi, Ota Hiroki Hide authors
SCIENCE ADVANCES 7 ( 10 ) 3793-1 - 3793-11 2021.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：American Association for the Advancement of Science ({AAAS}) Joint Work
Other Link： https://doi.org/10.1126/sciadv.abe3793
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Liquid metal-based nanocomposite materials: fabrication technology and applications
Ochirkhuyag Nyamjargal, Matsuda Ryosuke, Song Zihao, Nakamura Fumika, Endo Takuma, Ota Hiroki
NANOSCALE 13 ( 4 ) 2113 - 2135 2021.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry ({RSC}) Joint Work
Other Link： https://doi.org/10.1039/D0NR07479A
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Transformable Electrocardiograph Using Robust Liquid-Solid Heteroconnector
Takaya Maika, Matsuda Ryosuke, Inamori Go, Kamoto Umihiro, Isoda Yutaka, Tachibana Daiki, Nakamura … Show more authors
Takaya Maika, Matsuda Ryosuke, Inamori Go, Kamoto Umihiro, Isoda Yutaka, Tachibana Daiki, Nakamura Fumika, Fuchiwaki Ohmi, Okubo Yusuke, Ota Hiroki Hide authors
ACS SENSORS 6 ( 1 ) 212 - 219 2021.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society ({ACS}) Joint Work
Other Link： https://doi.org/10.1021/acssensors.0c02135
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R. Matsuda, S. Mizuguchi, F. Nakamura, T. Endo, Y. Isoda, G. Inamori, H. Ota
Scientific Reports 10 ( 1 ) 12666 2020.7 [Reviewed]
DOI Web of Science PubMed CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：Nature Portfolio Joint Work
Stretchable physical sensors are crucial for the development of advanced electrical systems, particularly wearable devices and soft robotics. Currently available stretchable sensors that detect both pressure and strain are based on piezoelectric, piezoresistive, or piezocapacitive effects. The range of pressure sensing is 1-800 kPa with large deformations being within the range of deformations of parts of the human body, such as elbows and knees. However, these devices cannot easily allow simultaneous and independent detection of pressure and strain with sensor arrays at large tensions (>50%) because strain affects the pressure signal. In this study, we propose a monolithic silicone-based array of pressure and strain sensors that can simultaneously and independently detect the in-plane biaxial tensile deformation and pressure. To realize these functionalities, the deformation of the device structure was optimized using a hetero-silicone substrate made of two types of silicone with different hardness characteristics and porous silicone bodies. In addition, the resistances of the sensors were controlled by adjusting a mixture based on carbon nanoparticles to improve the sensitivity and independence between the pressure and strain sensors. These concepts demonstrate the potential of this approach and its compatibility with the current architectures of stretchable physical sensors.
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A CATERPILLAR-INSPIRED SOFT ROBOT BASED ON THERMAL EXPANSION
Song Zihao, Matsuda Ryosuke, Matsubara Ken, Nakamura Fumika, Ota Hiroki
2020 33RD IEEE INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS 2020) 489 - 492 2020.4 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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ELECTRICALLY CONTROLLED GEL ACTUATOR USING LIQUID METAL ELECTRODE
Matsubara Ken, Tanaka Yoshimi, Fuchiwaki Ohmi, Ota Hiroki
2020 33RD IEEE INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS 2020) 501 - 504 2020.4 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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HIGHLY DEFORMABLE OPTOELECTRONICS USING LIQUID METAL
Kozaki Takashi, Satoshi Saito, Otsuki Yota, Matsuda Ryosuke, Isoda Yutaka, Endo Takuma, Nakamura Fu … Show more authors
Kozaki Takashi, Satoshi Saito, Otsuki Yota, Matsuda Ryosuke, Isoda Yutaka, Endo Takuma, Nakamura Fumika, Araki Takuto, Furukawa Taichi, Maruo Shoji, Watanabe Masayoshi, Ueno Kazuhide, Ota Hiroki Hide authors
2020 33RD IEEE INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS 2020) 1230 - 1233 2020.4 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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STRETCHABLE ARRAY OF RESISTIVE PRESSURE SENSORS IGNORING THE EFFECT OF STRAIN-INDUCED DEFORMATION
Matsuda Ryosuke, Mizuguchi Satoru, Nakamura Fumika, Endo Takuma, Inamori Go, Isoda Yutaka, Ota Hiro … Show more authors
Matsuda Ryosuke, Mizuguchi Satoru, Nakamura Fumika, Endo Takuma, Inamori Go, Isoda Yutaka, Ota Hiroki Hide authors
2020 33RD IEEE INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS 2020) 803 - 805 2020.4 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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WEARABLE MULTI VITAL MONITOR FOR NEWBORNS
Inamori Go, Isoda Yutaka, Kamoto Umihiro, Uozumi Azusa, Ito Shuichi, Ota Hiroki
2020 33RD IEEE INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS 2020) 337 - 339 2020.4 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Hydrogel Actuator with a Built‐In Stimulator Using Liquid Metal for Local Control
Ken Matsubara, Daiki Tachibana, Ryosuke Matsuda, Hiroaki Onoe, Ohmi Fuchiwaki, Hiroki Ota
Advanced Intelligent Systems, 2020. 2 ( 5 ) 2020.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Liquid-State Optoelectronics Using Liquid Metal
Kozaki Takashi, Saito Satoshi, Otsuki Yota, Matsuda Ryosuke, Isoda Yutaka, Endo Takuma, Nakamura Fu … Show more authors
Kozaki Takashi, Saito Satoshi, Otsuki Yota, Matsuda Ryosuke, Isoda Yutaka, Endo Takuma, Nakamura Fumika, Araki Takuto, Furukawa Taichi, Maruo Shoji, Watanabe Masayoshi, Ueno Kazuhide, Ota Hiroki Hide authors
ADVANCED ELECTRONIC MATERIALS 6 ( 3 ) 2020.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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3D Helical Micromixer Fabricated by Micro Lost-Wax Casting
Tachibana Daiki, Matsubara Ken, Matsuda Ryosuke, Furukawa Taichi, Maruo Shoji, Tanaka Yoshimi, Fuch … Show more authors
Tachibana Daiki, Matsubara Ken, Matsuda Ryosuke, Furukawa Taichi, Maruo Shoji, Tanaka Yoshimi, Fuchiwaki Ohmi, Ota Hiroki Hide authors
ADVANCED MATERIALS TECHNOLOGIES 5 ( 1 ) 2020.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Customized Smart Medical Devices Based on 3D Printing-assisted Fabrication
Ota Hiroki
Transactions of Japanese Society for Medical and Biological Engineering 58 ( 0 ) 204 - 204 2020
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society for Medical and Biological Engineering Single Work
<p>Aligned with the vision of Internet of Things, it is expected that the number of interconnected devices, equipped with sensing and actuation functionalities, will grow beyond trillions of units by 2025 representing about 1000 devices per person in the world. The need for personalization that inevitably ensues necessitates devising novel manufacturing processes that seamlessly integrate such functionalities into our surrounding objects. To this end, 3D printing is an excellent process, as it is capable of rapid and on-demand production of mechanically sophisticated and personalized objects with efficient use of materials. In this study, we propose fabrication method of smart devices based on a 3D printing and demonstrate an earable device for real-time monitoring of body temperature, and a wearable device for multi-vital monitoring of newborn baby.</p>
Other Link： https://ci.nii.ac.jp/naid/130007884919
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OKUBO Yusuke, KAMOTO Umihiro, TAQUAHASHI Yuhji, KITAJIMA Satoshi, OTA Hiroki
Annual Meeting of the Japanese Society of Toxicology 47 ( 0 ) O - 4 2020
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Toxicology Joint Work
<p>In toxicity studies, one of the core endpoint is clinical observation including vital signs (VSs). Measurement of VSs over time has already been realized in safety pharmacology in drug development, but not in toxicity studies on general chemical substances. We believe that simple VSs measurement technique can achieve both refinement of toxicity evaluation and reduction of the number of animals. In this study, we developed a wearable pulse oximeter for rats to measure SpO2, heart rate and respiratory rate. We succeeded to measure these VSs from conscious and unrestrained rats.</p>
Other Link： https://ci.nii.ac.jp/naid/130007898247
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Stretchable system on electronic substrate composed of hard and soft polymers
Nakamura Fumika, Matsuda Ryousuke, Isoda Yutaka, Endo Takuma, Ota Hiroki
The Proceedings of the Symposium on Micro-Nano Science and Technology 2020.11 ( 0 ) 26A3-MN2-6 2020
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
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A Stretchable Lithium-ion Battery Using Liquid-metal Nano Particle
Mizuguchi Satoru, Endo Takuma, Matsuda Ryosuke, Ueno Kazuhide, Ota Hiroki
The Proceedings of the Symposium on Micro-Nano Science and Technology 2020.11 ( 0 ) 28A3-MN3-1 2020
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
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Highly stretchable vibrating device using liquid metal
Kozaki Takashi, Ota Hiroki
The Proceedings of the Symposium on Micro-Nano Science and Technology 2020.11 ( 0 ) 28P1-MN3-8 2020
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
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Electromagnetic Gel Actuator for in-liquid high-speed movements
Tachibana Daiki, Kozaki Takashi, Murakami Koki, Ota Hiroki, Fuchiwaki Ohmi
The Proceedings of the Symposium on Micro-Nano Science and Technology 2020.11 ( 0 ) 27A2-MN1-1 2020
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
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Wearable Pulse Oximeter for Experimental Animals towards Diagnostic Toxicology
Kamoto Umihiro, Inamori Go, Isoda Yutaka, Taquahashi Yuhji, Kitajima Satoshi, Okubo Yusuke, Ota Hir … Show more authors
Kamoto Umihiro, Inamori Go, Isoda Yutaka, Taquahashi Yuhji, Kitajima Satoshi, Okubo Yusuke, Ota Hiroki Hide authors
The Proceedings of the Symposium on Micro-Nano Science and Technology 2020.11 ( 0 ) 28P1-MN3-6 2020
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
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Development of a liquid-state multi axis tilt sensor
Matsuda Ryosuke, Zihao Song, Okisaki Humio, Ota Hiroki
The Proceedings of the Symposium on Micro-Nano Science and Technology 2020.11 ( 0 ) 28P1-MN3-4 2020
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
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Liquid Metal Electrodes towards Conducting Agent and Binder of printed Li-ion Batteries
Endo Takuma, Nishitai Yuki, Ueno Kazuhide, Ota Hiroki
The Proceedings of the Symposium on Micro-Nano Science and Technology 2020.11 ( 0 ) 26A3-MN2-5 2020
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
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Wearable Iontophoresis Device Using Stretchable Electrodes Towards Transdermal Delivery
U. Kamoto, Y. Isoda, H. Ota
Transducers 2019 2019.6
Language：English Publishing type：Research paper (international conference proceedings) Publisher：EUROSENSORS XXXIII Berlin, Germany Joint Work
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Flexible Electronics Toward Wearable Sensing.
W. Gao, H. Ota, D. Kiriya, K. Takei, A. Javey
Acc. Chem. Res. 52 ( 3 ) 523 - 533 2019.2
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Stretchable liquid metal wiring with three-dimensional helical structure
K. Matsubara, H. Ota
2019 Proceedings of IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS) 296 - 298 2019.1
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
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Wearable optical device for real-time monitoring of newborn jaundice
G. Inamori, Y. Isoda, Z. Song, A. Uozumi, S. Ito, H. Ota
2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS) 541 - 543 2019.1
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
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A Caterpillar-inspired soft robot that based on thermal expansion
Song Zihao, Matsubara Ken, Matsuda Ryosuke, Ota Hiroki
The Proceedings of the Symposium on Micro-Nano Science and Technology 2019 ( 0 ) 2019
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
<p>This paper reports caterpillar-inspired soft robot based on thermal expansion with stretchable bending and flexible temperature sensor. The movement of soft robot was based on thermal expansion with highly volatile liquid. On account of thermodynamic method, this soft robot must have a bending sensor for the movement and a temperature sensor to monitor the soft robot's state at that moment. The primary objective of this research is to resolve the integration between soft sensor and actuator. The actuator bends due to thermal expansion. The system could control the thermal expansion change from the resistance of the calculated bending sensor.</p>
Other Link： https://ci.nii.ac.jp/naid/130007846825
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Electrically Controlled Gel Actuator using Liquid Metal Spring
Matsubara Ken, Hiroki Ota
The Proceedings of the Symposium on Micro-Nano Science and Technology 2019 ( 0 ) 2019
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
<p>This report demonstrates an electrically controlled gel actuator by a three-dimensional(3D) helical microspring with liquid metal. Previously, 3D helical wiring with liquid metal was established based on core-shell hydrogel microspring fabricated using a double bevel-tip nozzle[1]. In this study, with combining this 3D liquid metal wiring and rod of a thermo responsive gel, an electrically controlled gel actuator was realized. In general, gel actuators require change of environmental parameter such as temperature in entire chamber and/or needs harsh environment such as strong acid solution. Therefore, it is difficult to control actuations of gel actuators electrically, and individually. In this study, we succeeded in shrinking and bending of the gel actuator by 36 % and 44 ° by electrical control. In addition, actuations of each gel actuator inside same chamber was controlled individually.</p>
Other Link： https://ci.nii.ac.jp/naid/130007846795
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Liquid-state electrical components using photoresponsive ionic liquid
Kozaki Takashi, Maruo Shoji, Watanabe Masayoshi, Ueno Kazuhide, Ota Hiroki, Saito Satoshi, Otsuki Y … Show more authors
Kozaki Takashi, Maruo Shoji, Watanabe Masayoshi, Ueno Kazuhide, Ota Hiroki, Saito Satoshi, Otsuki Yota, Matsuda Ryosuke, Isoda Yutaka, Endo Takuma, Nakamura Fumika, Araki Takuto, Furukawa Taichi Hide authors
The Proceedings of the Symposium on Micro-Nano Science and Technology 2019 ( 0 ) 2019
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
<p>Liquid-state electronics utilizing functional liquids confined in soft templates as the sensing and actuating component present the ideal platform for enabling conformal coverage of electronic systems on curved and soft surfaces. However, to date, optoelectronic devices based on functional liquid materials as represented by photodetectors and optical memories still have not been proposed; this advancement is crucial to scaling up current liquid-state devices to a system level. Here, this study proposes optoelectronic devices based on liquid metal and photo-switchable ionic liquid with liquid-liquid heterojunction technology. The sensing and memory schemes we present are generic for different liquid-state devices, enabling different functionality to be added to the liquid-state electronics. As a proof of concept, we demonstrate a light sensor composed of the ionic liquid, and an optical memory using a composite of the ionic liquid and polypropylene glycol. These devices are important advancements towards the realization of liquid-state electronic systems.</p>
Other Link： https://ci.nii.ac.jp/naid/130007846798
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Wearable multi vital monitor for Newborns
Inamori Go, Isoda Yutaka, Kamoto Umihiro, Uozumi Azusa, Ito Shuichi, Ota Hiroki
The Proceedings of the Symposium on Micro-Nano Science and Technology 2019 ( 0 ) 2019
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
<p>In this study, wearable device that can monitor the multi vital signs of Jaundice, SpO<sub>2</sub>, and heart rate from newborn foreheads was developed. In order to observe details of body conditions of newborns, it is crucial to detect the multi vital signs such as Jaundice, heart rate and oxygen saturation of peripheral artery (SpO<sub>2</sub>). In addition, considering the handling of the devices, it is should be convenient to detect them from one device on the forehead, which does not need to take off their clothes or move newborns. In this study, we implemented the functionalities of Jaundice, heart rate and SpO<sub>2</sub> measurements into the device. The device irradiated newborn's forehead with BLUE, GREEN, RED, and IR (infrared) LED lights, and measure the 3 vital signs by reflected lights. Using the device, clinical experiments were conducted on neonates 1-5 days after birth. The device succeeded in the detection of bilirubin concentration, heart rate, and SpO<sub>2</sub>.</p>
Other Link： https://ci.nii.ac.jp/naid/130007846837
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Fabrication of stretchable pressure mapping sensor using porous silicone elastomer
Matsuda Ryosuke, Mizuguchi Satoru, Nakamura Fumika, Endo Takuma, Isoda Yutaka, Ota Hiroki
The Proceedings of the Symposium on Micro-Nano Science and Technology 2019 ( 0 ) 2019
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers Joint Work
<p>In this study, a stretchable array of resistive pressure sensors which could ignore the effect of stretch deformation was demonstrated. In terms of stretchable pressure sensors composed of elastic materials, pressure sensors itself are deformed during strain of the devices, which becomes large error of the pressure measurement. Our resistive sensors in a array are based on patterned porous conductive silicone (Ecoflex). The substrate consists of hetero-silicone rubbers of two different elastic silicones. In addition, resistances of column and row electrodes in the matrix of mapping are much lower than the pressure sensors. This substrate and control of electrode resistances can prevent stretch deformation of the device from affecting the sensing of pressure. The error of the pressure sensor in our device during 150 % strain was one sixth less than the one by conventional elastic pressure sensor composed of organic materials. This result suggests possibility to apply stretchable pressure sensor on largely deformed area of body, and soft robots.</p>
Other Link： https://ci.nii.ac.jp/naid/130007846965
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Stretchable Helical Wire Made with Liquid Metal
Ota Hiroki, Matsubara Ken
2019 14TH ANNUAL IEEE INTERNATIONAL CONFERENCE ON NANO/MICRO ENGINEERED AND MOLECULAR SYSTEMS (IEEE-NEMS 2019) 48 - 51 2019 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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STRETCHABLE LIQUID METAL WIRING WITH THREE-DIMENTIONAL HELICAL STRUCTURE
Matsubara Ken, Ota Hiroki
2019 IEEE 32ND INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS) 296 - 298 2019
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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WEARABLE IONTOPHORESIS DEVICE USING STRETCHABLE ELECTRODES TOWARDS TRANSDERMAL DELIVERY
Kamoto Umihiro, Isoda Yutaka, Ota Hiroki
2019 20TH INTERNATIONAL CONFERENCE ON SOLID-STATE SENSORS, ACTUATORS AND MICROSYSTEMS & EUROSENSORS XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) 2255 - 2257 2019
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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WEARABLE OPTICAL DEVICE FOR REAL-TIME MONITORING OF NEWBORN JAUNDICE
Inamori Go, Isoda Yutaka, Song Zihao, Uozumi Azusa, Ito Shuichi, Ota Hiroki
2019 IEEE 32ND INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS) 541 - 543 2019
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Patch-type Wireless Forehead Vital Sensing Device
H. Ota, Y. Isoda, G. Inamori
2018 IEEE International Symposium on Micro-NanoMechatronics and Human Science (MHS2018) 36 2018.11
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
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Methylxanthine drug monitoring with wearable sweat sensors
L.-C. Tai, W. Gao, M. Chao, M. Bariya, Q. P. Ngo, Z. Shahpar, H. Y. Y. Nyein, H. Park, J. Sun, Y. J … Show more authors
L.-C. Tai, W. Gao, M. Chao, M. Bariya, Q. P. Ngo, Z. Shahpar, H. Y. Y. Nyein, H. Park, J. Sun, Y. Jung, E. Wu, H. M. Fahad, D.-H. Lien, H. Ota, G. Cho, A. Javey Hide authors
Advanced Materials ( 1707442 ) 2018 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：wily Single Work
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Microchannel contacting of crystalline silicon solar cells.
J. Bullock, H. Ota, H. Wang, Z. Xu, M. Hettick, D. Yan, C. Samundsett, Y. Wan, S. Essig, M.M. -Masi … Show more authors
J. Bullock, H. Ota, H. Wang, Z. Xu, M. Hettick, D. Yan, C. Samundsett, Y. Wan, S. Essig, M.M. -Masis, A. Cuevas, A. Javey Hide authors
Scientific reports 7 ( 1 ) 9085 2017.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Nature Publishing Group Single Work
There is tremendous interest in reducing losses caused by the metal contacts in silicon photovoltaics, particularly the optical and resistive losses of the front metal grid. One commonly sought-after goal is the creation of high aspect-ratio metal fingers which provide an optically narrow and low resistance pathway to the external circuit. Currently, the most widely used metal contact deposition techniques are limited to widths and aspect-ratios of similar to 40 mu m and similar to 0.5, respectively. In this study, we introduce the use of a micropatterned polydimethylsiloxane encapsulation layer to form narrow (similar to 20 mu m) microchannels, with aspect-ratios up to 8, on the surface of solar cells. We demonstrate that low temperature metal pastes, electroless plating and atomic layer deposition can all be used within the microchannels. Further, we fabricate proof-of-concept structures including simple planar silicon heterojunction and homojunction solar cells. While preliminary in both design and efficiency, these results demonstrate the potential of this approach and its compatibility with current solar cell architectures.
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Wearable Microfluidic Diaphragm Pressure Sensor for Health and Tactile Touch Monitoring.
Y. Gao, H. Ota, E. W. Schaler, K. Chen, A. Zhao, W. Gao, H. M. Fahad, Y. Leng, A. Zheng, F. Xiong, … Show more authors
Y. Gao, H. Ota, E. W. Schaler, K. Chen, A. Zhao, W. Gao, H. M. Fahad, Y. Leng, A. Zheng, F. Xiong, C. Zhang, L. -C. Tai, P. Zhao, R. S. Fearing, A. Javey Hide authors
Advanced Materials 29 ( 39 ) 1701985 2017.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY Single Work
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3D Printed Earable Smart Devices for Real-time Detection of Core Body Temperature.
H. Ota, M. Chao, Y. Gao, E. Wu, L. -C. Tai, K. Chen, Y. Matsuoka, K. Iwai, H. Fahad, W. Gao, H. Y. … Show more authors
H. Ota, M. Chao, Y. Gao, E. Wu, L. -C. Tai, K. Chen, Y. Matsuoka, K. Iwai, H. Fahad, W. Gao, H. Y. Y. Nyein, L. Lin, A. Javey Hide authors
ACS Sensors 2 ( 7 ) 990 - 997 2017.7
Language：English Publishing type：Research paper (scientific journal) Publisher：Amer Chemical Society Single Work
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Room temperature multiplexed gas sensing using chemical-sensitive 3.5-nm-thin silicon transistors.
H. Fahad,H. Shiraki,M. Amani,C. Zhang, V. Hebbar, W. Gao, H. Ota, M. Hettick, D. Kiriya,Y. -Z, Chen … Show more authors
H. Fahad,H. Shiraki,M. Amani,C. Zhang, V. Hebbar, W. Gao, H. Ota, M. Hettick, D. Kiriya,Y. -Z, Chen, Y. -L.Chueh, A.Javey Hide authors
Science Advances 3 ( 3 ) e1602557 2017.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：AMER ASSOC ADVANCEMENT SCIENCE Joint Work
Other Link： http://advances.sciencemag.org/content/3/3/e1602557
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A Wearable Electrochemical Platform for Non-Invasive Simultaneous Monitoring of Ca2+and pH
H. Y. Y. Nyein, W. Gao, Z. Shahpar, S. Emaminejad, S. Challa, K. Chen, H. M. Fahad, L.-C. Tai, H. O … Show more authors
H. Y. Y. Nyein, W. Gao, Z. Shahpar, S. Emaminejad, S. Challa, K. Chen, H. M. Fahad, L.-C. Tai, H. Ota, R. W. Davis, A. Javey Hide authors
ACS Nano 10 ( 7 ) 7216 - 7224 2016.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Printed Carbon Nanotube Electronics and Sensor Systems.
K. Chen, W. Gao, S. Emaminejad, D. Kiriya, H. Ota, H. Y. Y. Nyein, K. Takei, A. Javey
Advanced Materials 28 ( 22 ) 4397 - 4414 2016.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY Joint Work
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Wearable Microsensor Array for Multiplexed Heavy Metal Monitoring of Body Fluid
W. Gao, H. Y. Y. Nyein, Z. Shahpar, H. M. Fahad, K. Chen, S. Emaminejad, Y. Gao, L. -C. Tai, H. Ota … Show more authors
W. Gao, H. Y. Y. Nyein, Z. Shahpar, H. M. Fahad, K. Chen, S. Emaminejad, Y. Gao, L. -C. Tai, H. Ota, E. Wu, J. Bullock, Y. Zeng, D. H. Lien, A. Javey Hide authors
ACS Sensors 1 ( 7 ) 866 - 874 2016.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC Joint Work
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Application of 3D printing for smart objects with embedded electronic sensors and systems.
H. Ota, S. Emaminejad, Y. Gao, A. Zhao, E. Wu, S. Challa, K. Chen, H. M. Fahad, A. K. Jha, D. Kiriy … Show more authors
H. Ota, S. Emaminejad, Y. Gao, A. Zhao, E. Wu, S. Challa, K. Chen, H. M. Fahad, A. K. Jha, D. Kiriya, W. Gao, H. Shiraki, K. Morioka, A. R. Fergson, K. E. Healy, R. W. Davis, A. Javey Hide authors
Advanced Materials Technologies 1 ( 1 ) 1 - 8 2016.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY Joint Work
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Fully-integrated wearable sensor arrays for multiplexed in-situ perspiration analysis.
W.Gao,S.Emaminejad,H.Y.Y.Nyein,S.Challa,K.Chen,A.Peck,H.Fahad,H.Ota,S.Hiroshi,D.Kiriya,D.-H,Lien,G. … Show more authors
W.Gao,S.Emaminejad,H.Y.Y.Nyein,S.Challa,K.Chen,A.Peck,H.Fahad,H.Ota,S.Hiroshi,D.Kiriya,D.-H,Lien,G.A.Brooks,R.W.Davis,A.Javey Hide authors
Nature 529 ( 7587 ) 509 - 514 2016.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：NATURE PUBLISHING GROUP Joint Work
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Efficient silicon solar cells with dopant-free asymmetric heterocontacts.
J. Bullock, M. Hettick, J. Geissbühler, A. J. Ong, T. Allen, C. M. Sutter-Fella, T. Chen, H. Ota, E … Show more authors
J. Bullock, M. Hettick, J. Geissbühler, A. J. Ong, T. Allen, C. M. Sutter-Fella, T. Chen, H. Ota, E. W. Schaler, S. De Wolf, C. Ballif, A. Cuevas, A. Javey Hide authors
Nature Energy 1 15031 2016.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：NATURE PUBLISHING GROUP Joint Work
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Wearable Sweat Biosensors
W. Gao, H. Y. Y. Nyein, Z. Shahpar, L.-C. Tai, E. Wu, M. Bariya, H. Ota, H. M. Fahad, K. Chen, A. J … Show more authors
W. Gao, H. Y. Y. Nyein, Z. Shahpar, L.-C. Tai, E. Wu, M. Bariya, H. Ota, H. M. Fahad, K. Chen, A. Javey. Hide authors
IEEE IEDM Technical Digest 6 ( 6 ) 1 - 6 2016 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Electron Devices Soc Joint Work
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Integrated Manufacture of Exoskeletons and Sensing Structures for Folded Millirobots.
D. W. Haldane, C. Casarez, J. Karras, J. Lee, C. Li, A. O. Pullin, E. W. Schaler, D. Yun, H. Ota, A … Show more authors
D. W. Haldane, C. Casarez, J. Karras, J. Lee, C. Li, A. O. Pullin, E. W. Schaler, D. Yun, H. Ota, A. Javey, and R. S. Fearing Hide authors
Journal of Mechanisms and Robotics 7 ( 2 ) 021011 - 021036 2015.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ASME Joint Work
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Micro-patterned cell-sheets fabricated with stamping-force-controlled micro-contact printing.
N. Tanaka, H. Ota, K. Fukumori, J. Miyake, M. Yamato, and T. Okano
Biomaterials 35 ( 37 ) 9802 - 9810 2014.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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Highly-deformable liquid-state heterojunction sensors.
H. Ota, K. Chen, Y. Lin, H. Shiraki, D. Kiriya, Z. Yu, T.-J. Ha, and A. Javey
Nature Communications 5 ( 5032 ) 1 - 9 2014.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：NATURE PUBLISHING GROUP Joint Work
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Oxygen consumption of human heart cells in monolayer culture.
K. Sekine, Y. Kagawa, E. Maeyama, H. Ota, Y. Haraguchi, K. Matsuura, and T. Shimizu
Biochemical and Biophysical Research Communications (B. B. R. C.) 452 ( 3 ) 834 - 839 2014.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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Design of Surfactant-Substrate Interactions for Roll-to-Roll Assembly of Carbon Nanotubes for Thin-Film Transistors.
D.Kiriya,K.Chen,H.Ota,Y.Lin,P.Zhao,Z.Yu,T.-J.Ha,and A.Javey
Journal of the American Chemical Society (J. A. C. S.) 136 ( 31 ) 11188 - 11194 2014.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC Joint Work
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Highly-sensitive electronic-whiskers based on patterned carbon nanotube and silver nanoparticle composite films.
K. Takei, Z. Yu, M. Zheng, H. Ota, T. Takahashi, and A. Javey
Proceedings of the National Academy of Sciences (P. N. A. S.) 111 ( 5 ) 1703 - 1707 2014.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：NATL ACAD SCIENCES Joint Work
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Microtechnology-based three-dimensional spheroid formation.
H. Ota and N. Miki
Frontiers in Bioscience ( E5 ) 37 - 48 2013.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Microfluidic experimental platform for producing size-controlled three-dimensional spheroids.
H. Ota and N. Miki
Sensors and Actuators A 169 ( 2 ) 266 - 273 2011 [Reviewed]
Language：English Publishing type：Research paper (international conference proceedings) Publisher：ELSEVIER Joint Work
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Rapid formation of size-controlled three dimensional hetero-cell aggregates using micro-rotation flow for spheroid study.
H. Ota, K. Taiga, and N. Miki
Biomicrofluidics 5 ( 3 ) 34105 - 3410515 2011 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：AMER INST PHYSICS Joint Work
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Three-dimensional spheroid forming lab-on-a-chip using micro-rotational flow.
H. Ota, R. Yamamoto, K. Deguchi, Y. Tanaka, Y. Kazoe, Y. Sato, and N. Miki
Sensors and Actuators B 147 ( 1 ) 359 - 365 2010 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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Parallel formation of three-dimensional spheroid using micro-rotational flow.
H. Ota and N. Miki
Journal of Robotics and Mechatronics 22 ( 5 ) 587 - 593 2010 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Photochemically induced increase in endothelial permeablity regulated by RhoA activation.
H. Ota, M. Matsumura, N. Miki, and H. Minamitani
Photochemical & Photobiological Sciences 8 ( 10 ) 1401 - 1407 2009 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY Joint Work
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MINAMITANI Haruyuki,OTA Hiroki,NAKADATE Hiromichi,ODAWARA Mariko,SEKIDUKA Eiichi,OSHIO Chikara
The Journal of Japanese Society on Thrombosis and Hemostasis 19 ( 1 ) 129 - 139 2008 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society on Thrombosis and Hemostasis Joint Work
Other Link： https://www.jstage.jst.go.jp/article/jjsth/19/1/19_1_129/_article/-char/ja/
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A Fundamental Study on Increasing of Endothelial Permeability by Photochemical Reaction
OTA Hiroki,MATSUMURA Mimiko,MINAMITANI Haruyuki
The transactions of the Institute of Electrical Engineers of Japan 127 ( 10 ) 1522 - 1528 2007 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Institute of Electrical Engineers of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/ieejeiss/127/10/127_10_1522/_article/-char/ja/