Faculty Profiles - MATSUNAGA Masahiro

Papers - MATSUNAGA Masahiro

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Spray-coated carbon nanotubes as alternatives to ITO electrodes for inverted perovskite solar cells Reviewed

N. Ueoka, M. Yagisawa, H. Oshima, K. Higuchi, Y. Hijikata, M. Matsunaga, Y. Ohno, H. Lin and Y. Matsuo

Japanese Journal of Applied Physics 2025.3

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 Vol. 76 page： 479 - 486 2023.9

In-plane dual-electrode triboelectric nanogenerator based on differential surface functionalization Reviewed

Matsunaga Masahiro, Hirotani Jun, Ohno Yutaka

APPLIED PHYSICS EXPRESS Vol. 15 ( 2 ) 2022.2

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：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

Stretchable triboelectric nanogenerator based on carbon nanotubes

MATSUNAGA Masahiro, KAWAGUCHI Atsushi, OHNO Yutaka

Oyo Buturi Vol. 90 ( 11 ) page： 684 - 688 2021.11

Language：Japanese Publisher：The Japan Society of Applied Physics

<p>Triboelectric energy harvesters are expected as a power source for self-powered wearable devices since they can generate electricity from the low-frequency motion of the human body. For wearable device applications, high stretchability is required to follow the dynamic three-dimensional surface of the human body. We have realized a stretchable sheet-shaped triboelectric energy harvester with a high output and elasticity. The high output has been achieved by a fluorine plasma treatment for the surface of the dielectric layer. We demonstrate a self-powered signal transmitter and LED-embedded gloves, exploiting the characteristics of the harvester. Furthermore, we propose a highly efficient intermittent operation circuit to drive electronic devices, using a small amount of power generated by the harvester. Our study can contribute to solve the problem of power source limitations in wearable electronics.</p>

DOI： 10.11470/oubutsu.90.11_684

CiNii Research

Investigation of plant leaf-derived graphene quantum dot clusters via magnetic force microscopy Reviewed

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

NANOTECHNOLOGY Vol. 32 ( 24 ) page： 245704 2021.6

Language：English Publishing type：Research paper (scientific journal) Publisher：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 Reviewed

Kawaguchi Atsushi, Uchiyama Haruki, Matsunaga Masahiro, Ohno Yutaka

APPLIED PHYSICS EXPRESS Vol. 14 ( 5 ) 2021.5

Language：English Publisher：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 Vol. 67 2020.1

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 Vol. 154 page： 238 - 243 2019.12

Hot carriers in CVD-grown graphene device with a top h-BN layer Reviewed

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 Vol. 2018 page： 5174104 2018

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

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 Vol. 29 page： 225301 2017

Probing weak localization in chemical vapor deposition graphene wide constriction using scanning gate microscopy Reviewed

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

Nanotechnology Vol. 27 page： 075601 2016

Nanoscale-Barrier Formation Induced by Low-Dose Electron-Beam Exposure in Ultrathin MoS2 Transistors Reviewed

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 Vol. 10 page： 9730 2016

Thermally Assisted Nonvolatile Memory in Monolayer MoS2 Transistors Reviewed

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 Vol. 16 page： 6445 2016

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

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 Vol. 6 page： 33118 2016

High Current-Induced Electron Redistribution in a CVD-Grown Graphene Wide Constriction Reviewed

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

Journal of Nanomaterials Vol. 2016 page： 1806871 2016

Imaging coherent transport in chemical vapor deposition graphene wide constriction by scanning gate microscopy Reviewed

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 Vol. 108 page： 123105 2016

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

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 Vol. 15 page： 5052 2015

The magnetic Y-branch nanojunction: Domain-wall structure and magnetoresistance Reviewed

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

Applied Physics Letters Vol. 101 page： 102403 2012

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Papers - MATSUNAGA Masahiro