Faculty of Science and Technology

Daisuke HAYASHI

  (林 大介)

Profile Information

Affiliation
Assistant Professor, Faculty of Science and Technology Department of Science and Technology , Seikei University
Degree
Doctor of Philosophy in Science(Mar, 2020, Tokyo Metropolitan University)

Researcher number
30890438
J-GLOBAL ID
202101016442608714
researchmap Member ID
R000027687

Papers

 4
  • Daisuke Hayashi, Yusuke Nakai, Haruka Kyakuno, Yasumitsu Miyata, Kazuhiro Yanagi, Yutaka Maniwa
    Applied Physics Express, 13(1) 015001-015001, Jan 1, 2020  Peer-reviewed
  • Daisuke Hayashi, Yusuke Nakai, Haruka Kyakuno, Naoya Hongo, Yasumitsu Miyata, Kazuhiro Yanagi, Yutaka Maniwa
    Japanese Journal of Applied Physics, 58(7) 075003-075003, Jul 1, 2019  Peer-reviewed
  • Daisuke Hayashi, Yusuke Nakai, Haruka Kyakuno, Takahiro Yamamoto, Yasumitsu Miyata, Kazuhiro Yanagi, Yutaka Maniwa
    Applied Physics Express, 9(12) 125103-125103, Dec 1, 2016  Peer-reviewed
    Doped single-wall carbon nanotube (SWCNT) films were prepared and their Seebeck coefficient (S) and electrical resistivity (ρ) were investigated as functions of carrier density. For heavy doping, a second maximum of S (S = 35 µV/K) was discovered, with its corresponding power factor, P = 85 µW/(m·K2), 6 times that of the first maximum for lightly doped films. Calculations for zigzag SWCNTs suggest that the thermoelectric performance can be effectively improved by controlling the multiplicity of the one-dimensional band and tuning the carrier density. This provides a new strategy for achieving higher performance at a lower cost than using high-purity semiconducting SWCNTs.
  • Daisuke Hayashi, Tomohiro Ueda, Yusuke Nakai, Haruka Kyakuno, Yasumitsu Miyata, Takahiro Yamamoto, Takeshi Saito, Kenji Hata, Yutaka Maniwa
    Applied Physics Express, 9(2) 025102-025102, Feb 1, 2016  Peer-reviewedLead author
    The Seebeck coefficient S and the electrical resistivity ρ of single-wall carbon nanotube (SWCNT) films were investigated as a function of the SWCNT diameter and carrier concentration. The S and ρ significantly changed in humid environments through p-type carrier doping. Experiments, combined with theoretical simulations based on the non-equilibrium Green’s function theory, indicated that the power factor P can be increased threefold by the enrichment of semiconducting SWCNTs, but the nanotube diameter has little effect. The improvement of the film resistivity strongly enhances the film thermoelectric performance, manifested as increasing the value of P above 1200 µW/(m·K2).

Books and Other Publications

 1