研究者詳細 - 松永　正広

論文 - 松永　正広

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ウェアラブルデバイスへの実装を目指した柔軟な摩擦帯電型エネルギーハーベスタ

松永正広、大野雄高

月刊せんい 76 巻頁： 479 - 486 2023年9月

In-plane dual-electrode triboelectric nanogenerator based on differential surface functionalization 査読有り

Matsunaga Masahiro, Hirotani Jun, Ohno Yutaka

APPLIED PHYSICS EXPRESS 15 巻 ( 2 ) 2022年2月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Applied Physics Express

Stretchable triboelectric nanogenerators (s-TENGs) are promising power sources for self-powered wearable electronics. Conventional single-electrode s-TENGs require an external ground electrode to form a closed circuit. We propose an in-plane dual-electrode s-TENG based on differential surface functionalization to eliminate the external ground electrode. The s-TENG comprises fully stretchable materials such as carbon nanotube thin films and elastomers. The top surface of the elastomer was functionalized to produce a difference in electronegativity between the two electrode regions. A high output power density of 3.5 W m-2 was obtained by tapping the two electrode regions by hand.

DOI： 10.35848/1882-0786/ac4d07

Web of Science

Scopus

カーボンナノチューブを用いた柔軟性に富む摩擦帯電型エネルギーハーベスタ

松永正広, 川口敦司, 大野雄高

応用物理 90 巻 ( 11 ) 頁： 684 - 688 2021年11月

記述言語：日本語出版者・発行元：公益社団法人応用物理学会

<p>摩擦帯電型エネルギーハーベスタは人体の動作などの低周波の運動から発電することが可能であり，自己給電型ウェアラブルデバイスの電源として期待されている．ウェアラブルデバイスにおいては人体の動的な3次元表面に追従する必要があり，高い伸縮性が要求される．本研究では，カーボンナノチューブ薄膜電極を用いることにより，高出力（8W/m<sup>2</sup>）かつ高伸縮性（35%）をもつシート状の摩擦帯電型エネルギーハーベスタを実現している．誘電体層表面にフッ素プラズマ処理を施すことにより高出力を得た．作製したハーベスタの特徴を生かし，自己発電型信号送信デバイスやLEDを埋め込んだ手袋を実証する．さらに，微小な電力を蓄積して機能デバイスの駆動に有効な電力を実現するための高効率な間欠動作回路の提案と実証も行う．本研究はウェアラブルデバイスの課題である電源の問題に解決の糸口を与えると期待される．</p>

DOI： 10.11470/oubutsu.90.11_684

CiNii Research

Investigation of plant leaf-derived graphene quantum dot clusters via magnetic force microscopy 査読有り

Chuang Chiashain, Matsunaga Masahiro, Wang Tian-Hsin, Roy Prathik, Ravindranath Rini, Ananthula Meenakshi, Aoki Nobuyuki

NANOTECHNOLOGY 32 巻 ( 24 ) 頁： 245704 2021年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Nanotechnology

Magnetic force microscopy (MFM) is utilized to characterize the magnetic moment in nanostructured plant leaf-derived graphene quantum dot clusters (GQDCs). The MFM signal reveals that the magnetic response of the GQDCs depends on the height and width of the GQDCs. However, individual GQDs, and smaller clusters with widths of less than 20 nm, have not shown any observable magnetic signal. Importantly, experimental analyses suggest that the magnetic signal of GQDCs distributed in a plane can be effectively detected at room temperature. These results could pave the way for future graphene-based magnetic storage media and spin manipulation quantum devices.

DOI： 10.1088/1361-6528/abeadb

Web of Science

Scopus

PubMed

Simple and highly efficient intermittent operation circuit for triboelectric nanogenerator toward wearable electronic applications 査読有り

Kawaguchi Atsushi, Uchiyama Haruki, Matsunaga Masahiro, Ohno Yutaka

APPLIED PHYSICS EXPRESS 14 巻 ( 5 ) 2021年5月

記述言語：英語出版者・発行元：Applied Physics Express

Triboelectric nanogenerator (TENG) is a promising power source toward the realization of self-powered wearable electronics. However, because of its pulsed output, a power management circuit, such as an intermittent operation circuit and AC-DC converter, is required to drive electronic devices. In this study, we propose a simple and highly efficient intermittent operation circuit composed of a programmable unijunction transistor. The energy transfer efficiency from the storage capacitor to the load reached 89%. We demonstrated that the intermittent circuit can be used to drive electronic devices such as stopwatches and wristwatches using the electricity generated by a carbon-nanotube-based stretchable TENG. © 2021 The Japan Society of Applied Physics.

DOI： 10.35848/1882-0786/abf405

Web of Science

Scopus

High-output, transparent, stretchable triboelectric nanogenerator based on carbon nanotube thin film toward wearable energy harvesters

Matsunaga Masahiro, Hirotani Jun, Kishimoto Shigeru, Ohno Yutaka

NANO ENERGY 67 巻 2020年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Nano Energy

Self-powered electronics can improve wearable health monitoring systems. Triboelectric generation, a type of energy harvesting technology, is a promising candidate as power source for wearable devices by generating electricity from body motion. For wearable energy harvesters, stretching is required for adaptation to dynamic three-dimensional body motions, and sufficient output power should be delivered for driving electronic devices. However, the currently demonstrated output power remains insufficient for using stretchable triboelectric generation in practice. We propose high-output (8 W/m2), stretchable triboelectric generators based on transparent carbon nanotube thin films. We realize high output by the surface treatment with fluorine plasma as well as stretchability by scalable and cost-effective spray coated carbon nanotube thin films. The carbon nanotube films also provide excellent scalability, optical transparency (95% transmittance), and durability under large deformations of tensile strain up to 80%. We also demonstrate applications to self-powered optical wireless communication sheets and gloves, where blue light emitting diodes are embedded in the triboelectric nanogenerator sheet and wired using stretchable carbon nanotube films. Our stretchable energy harvesting sheets can contribute to solve major problems in wearable electronics (i.e., power source limitations) at low cost.

DOI： 10.1016/j.nanoen.2019.104297

Web of Science

Scopus

Conductance interference effects in an electron-beam-resist-free chemical vapor deposition graphene device sandwiched between two h-BN sheets

Chuang Chiashain, Mineharu Masaaki, Matsunaga Masahiro, Liu Chieh-Wen, Wu Bi-Yi, Kim Gil-Ho, Watanabe Kenji, Taniguchi Takashi, Liang Chi-Te, Aoki Nobuyuki

CARBON 154 巻頁： 238 - 243 2019年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Carbon

We report fabrication and measurements of hexagonal boron nitride (h-BN)/chemical vapor deposition (CVD) graphene/h-BN heterostructure devices without using expensive, time-consuming electron-beam lithography and toxic carbon tetrafluoride or sulfur tetrafluoride etching. We use efficient transfer of h-BN/CVD graphene by polypropylene carbonate onto a pre-prepared metal contacts/h-BN/SiO2 substrate. In this case, CVD-graphene is suspended from the h-BN substrate which allows efficient gas annealing process for improving the device mobility. Interestingly, we find that the top h-BN capping layer could enhance the carrier interference effect in CVD graphene, a great advantage for low-cost graphene-based interference-type electronic devices.

DOI： 10.1016/j.carbon.2019.07.057

Web of Science

Scopus

Hot carriers in CVD-grown graphene device with a top h-BN layer 査読有り

Chiashain Chuang, Masaaki Mineharu, Naoki Matsumoto, Masahiro Matsunaga, Chieh-Wen Liu, Bi-Yi Wu, Gil-Ho Kim, Li-Hung Lin, Yuichi Ochiai, Kenji Watanabe, Takashi Taniguchi, Chi-Te Liang, Nobuyuki Aoki

Journal of Nanomaterials 2018 巻頁： 5174104 2018年

Shubnikov-de Haas measurements on a high mobility monolayer graphene flake sandwiched between boron nitride sheets 査読有り

Naoki Matsumoto, Masaaki Mineharu, Masahiro Matsunaga, Chiashain Chuang, Yuichi Ochiai, Kenichi Oto, Gil-Ho Kim, Kenji Watanabe, Takashi Taniguchi, David K. Ferry, Carlo R. da Cunha, Nobuyuki Aoki

Journal of Physics: Condensed Mater 29 巻頁： 225301 2017年

Probing weak localization in chemical vapor deposition graphene wide constriction using scanning gate microscopy 査読有り

Chiashain Chuang, Masahiro Matsunaga, Fan-Hung Liu, Tak-Pong Woo, Nobuyuki Aoki, Li-Hung Lin, Bi-Yi Wu, Yuichi Ochiai, Chi-Te Liang

Nanotechnology 27 巻頁： 075601 2016年

Nanoscale-Barrier Formation Induced by Low-Dose Electron-Beam Exposure in Ultrathin MoS2 Transistors 査読有り

Masahiro Matsunaga, Ayaka Higuchi, Guanchen He, Tetsushi Yamada, Peter Krüger, Yuichi Ochiai, Yongji Gong, Robert Vajtai, Pulickel M. Ajayan, Jonathan P. Bird, Nobuyuki Aoki

ACS Nano 10 巻頁： 9730 2016年

Thermally Assisted Nonvolatile Memory in Monolayer MoS2 Transistors 査読有り

Guanchen He, Harihara Ramamoorthy, Chun-Pui Kwan, Yao-Hsuen Lee, Jubin Nathawat, Ratchanok Somphonsane, Masahiro Matsunaga, Ayaka Higuchi, Tomoki Yamanaka, Nobuyuki Aoki, Yongji Gong, Xiang Zhang, Robert Vajtai, Pulickel M. Ajayan, Jonathan P. Bird

Nano Letters 16 巻頁： 6445 2016年

Conductance fluctuations in high mobility monolayer graphene: Nonergodicity, lack of determinism and chaotic behavior 査読有り

Carlo R. da Cunha, Masaaki Mineharu, Masahiro Matsunaga, Naoki Matsumoto, Chiashain Chuang, Yuichi Ochiai, Gil-Ho Kim, Kenji Watanabe, Takashi Taniguchi, David K. Ferry, Nobuyuki Aoki

Scientific Reports 6 巻頁： 33118 2016年

High Current-Induced Electron Redistribution in a CVD-Grown Graphene Wide Constriction 査読有り

Chiashain Chuang, Tak-Pong Woo, Fan-Hung Liu, Masahiro Matsunaga, Yuichi Ochiai, Nobuyuki Aoki, Chi-Te Liang

Journal of Nanomaterials 2016 巻頁： 1806871 2016年

Imaging coherent transport in chemical vapor deposition graphene wide constriction by scanning gate microscopy 査読有り

Chiashain Chuang, Masahiro Matsunaga, Fan-Hung Liu, Tak-Pong Woo, Li-Hung Lin, Kenichi Oto, Yuichi Ochiai, Chi-Te Liang, Nobuyuki Aoki

Applied Physics Letters 108 巻頁： 123105 2016年

Conduction Mechanisms in CVD-Grown Monolayer MoS2 Transistors: From Variable-Range Hopping to Velocity Saturation 査読有り

Guanchen He, Krishnendu Ghosh, Uttam Singisetti, Harihara Ramamoorthy, Ratchanok Somphonsane, Girish Bohra, Masahiro Matsunaga, Ayaka Higuchi, Nobuyuki Aoki, Sina Najmaei, Yongji Gong, Xiang Zhang, Robert Vajtai, Pulickel M. Ajayan, Jonathan P. Bird

Nano Letters 15 巻頁： 5052 2015年

The magnetic Y-branch nanojunction: Domain-wall structure and magnetoresistance 査読有り

Zhiying Chen, Teng-Yin Lin, Xiaojun Wei, Masahiro Matsunaga, Tatsuya Doi, Yuichi Ochiai, Nobuyuki Aoki, Jonathan P. Bird

Applied Physics Letters 101 巻頁： 102403 2012年

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