Publications
ResearcherID : C-5956-2008 (TY, h-index: 24) , AAZ-8749-2021 (RK, h-index: 11)
Google Scholar : TY (h-index: 33), RK (h-index: 11)
2016
Takashi Yatsui, Kazunori Kuribara, Tsuyoshi Sekitani, Takao Someya, Mamoru Yoshimoto
Temperature-modulated annealing of c-plane sapphire for long-range-ordered atomic steps Journal Article
In: Journal of Physics D: Applied Physics, vol. 49, no. 11, pp. 115302, 2016.
Abstract | Links | BibTeX | Tags: chocolate, First, sapphire, tempering
@article{Yatsui_2016,
title = {Temperature-modulated annealing of c-plane sapphire for long-range-ordered atomic steps},
author = {Takashi Yatsui and Kazunori Kuribara and Tsuyoshi Sekitani and Takao Someya and Mamoru Yoshimoto},
url = {https://doi.org/10.1088%2F0022-3727%2F49%2F11%2F115302},
doi = {10.1088/0022-3727/49/11/115302},
year = {2016},
date = {2016-03-23},
journal = {Journal of Physics D: Applied Physics},
volume = {49},
number = {11},
pages = {115302},
publisher = {IOP Publishing},
abstract = {High-quality single-crystalline sapphire is used to prepare various semiconductors because of its thermal stability. Here, we applied the tempering technique, which is well known in the production of chocolate, to prepare a sapphire substrate. Surprisingly, we successfully realised millimetre-range ordering of the atomic step of the sapphire substrate. We also obtained a sapphire atomic step with nanometre-scale uniformity in the terrace width and atomic-step height. Such sapphire substrates will find applications in the preparation of various semiconductors and devices.},
keywords = {chocolate, First, sapphire, tempering},
pubstate = {published},
tppubtype = {article}
}
High-quality single-crystalline sapphire is used to prepare various semiconductors because of its thermal stability. Here, we applied the tempering technique, which is well known in the production of chocolate, to prepare a sapphire substrate. Surprisingly, we successfully realised millimetre-range ordering of the atomic step of the sapphire substrate. We also obtained a sapphire atomic step with nanometre-scale uniformity in the terrace width and atomic-step height. Such sapphire substrates will find applications in the preparation of various semiconductors and devices.
2013
Takashi Yatsui, Kazaunori Iijima, Tsubasa Imoto, Kokoro Kitamura, Tadashi Kawazoe
Phonon-assisted near-field activation of electron transfer Journal Article
In: Journal of Nanophotonics, vol. 7, no. 1, pp. 1 – 8, 2013.
Abstract | Links | BibTeX | Tags: Absorption, Electrodes, First, Nanostructuring, Non-uniform optical near field, Platinum, sapphire
@article{10.1117/1.JNP.7.073796,
title = {Phonon-assisted near-field activation of electron transfer},
author = {Takashi Yatsui and Kazaunori Iijima and Tsubasa Imoto and Kokoro Kitamura and Tadashi Kawazoe},
doi = {10.1117/1.JNP.7.073796},
year = {2013},
date = {2013-09-01},
journal = {Journal of Nanophotonics},
volume = {7},
number = {1},
pages = {1 -- 8},
publisher = {SPIE},
abstract = {An optical near field should promote phonon-assisted multiple excitation in nanoscale structures. With the phonon-assisted process, greater catalytic activity is expected without heating. To confirm this effect, photo-induced current generation using platinum black electrodes in ferricyanide solution (an absorption band-edge wavelength of 470 nm) under visible light irradiation continuous wave [(CW), λ=532 nm ] was observed. Higher order dependence of the generated current density on the incident light power was observed, indicating two-step activation of electron transfer, which originated from the phonon-assisted near-field effect on the nanostructured surface of the electrode.},
keywords = {Absorption, Electrodes, First, Nanostructuring, Non-uniform optical near field, Platinum, sapphire},
pubstate = {published},
tppubtype = {article}
}
An optical near field should promote phonon-assisted multiple excitation in nanoscale structures. With the phonon-assisted process, greater catalytic activity is expected without heating. To confirm this effect, photo-induced current generation using platinum black electrodes in ferricyanide solution (an absorption band-edge wavelength of 470 nm) under visible light irradiation continuous wave [(CW), λ=532 nm ] was observed. Higher order dependence of the generated current density on the incident light power was observed, indicating two-step activation of electron transfer, which originated from the phonon-assisted near-field effect on the nanostructured surface of the electrode.