Zobrazeno 1 - 10
of 321
pro vyhledávání: '"Koji Kimoto"'
Autor:
Barun Kumar Barman, David Hernández‐Pinilla, Ovidiu Cretu, Jun Kikkawa, Koji Kimoto, Tadaaki Nagao
Publikováno v:
Advanced Science, Vol 11, Iss 41, Pp n/a-n/a (2024)
Abstract Metal‐free, luminescent, carbogenic nanomaterials (LCNMs) constitute a novel class of optical materials with low environmental impact. LCNMs, e.g., carbon dots (CDs), graphitic carbon nitride (g‐C3N4), and carbonized polymer microspheres
Externí odkaz:
https://doaj.org/article/15f978680e4e4af5b1f930ccbd005f0a
Publikováno v:
NPG Asia Materials, Vol 16, Iss 1, Pp 1-10 (2024)
Abstract The intermediate-range order of covalently bonded glasses has been extensively studied in terms of their diffraction peaks observed at low scattering angles; these peaks are called the first sharp diffraction peaks (FSDPs). Although the atom
Externí odkaz:
https://doaj.org/article/47913bda66b3420aaa81c6fdc390e9c5
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-10 (2024)
Abstract Unsupervised machine learning techniques have been combined with scanning transmission electron microscopy (STEM) to enable comprehensive crystal structure analysis with nanometer spatial resolution. In this study, we investigated large-scal
Externí odkaz:
https://doaj.org/article/beb8d7630c0d41748e7e5da37becf6cf
Autor:
Shunsuke Yamashita, Sei Fukushima, Jun Kikkawa, Ryoji Arai, Yuya Kanitani, Koji Kimoto, Yoshihiro Kudo
Publikováno v:
APL Materials, Vol 12, Iss 3, Pp 031101-031101-8 (2024)
Defects in semiconductor materials significantly impact their inherent properties, making the evaluation of local defects and their energy levels crucial for controlling device performance. With advancements in monochromators, electron energy loss sp
Externí odkaz:
https://doaj.org/article/cef3b4dcaf7945c5998efbb09f8a0802
Autor:
Yunqing Kang, Ovidiu Cretu, Jun Kikkawa, Koji Kimoto, Hiroki Nara, Asep Sugih Nugraha, Hiroki Kawamoto, Miharu Eguchi, Ting Liao, Ziqi Sun, Toru Asahi, Yusuke Yamauchi
Publikováno v:
Nature Communications, Vol 14, Iss 1, Pp 1-12 (2023)
Abstract Multimetallic alloys (MMAs) with various compositions enrich the materials library with increasing diversity and have received much attention in catalysis applications. However, precisely shaping MMAs in mesoporous nanostructures and mapping
Externí odkaz:
https://doaj.org/article/53708bc997f64c25a7f69fb24904dcc9
Autor:
Koji Kimoto, Motoki Shiga, Shinji Kohara, Jun Kikkawa, Ovidiu Cretu, Yohei Onodera, Kazuo Ishizuka
Publikováno v:
AIP Advances, Vol 12, Iss 9, Pp 095219-095219-6 (2022)
The crystallographic structures of disordered materials are typically analyzed using diffractometry techniques, such as x-ray diffraction (XRD), neutron diffraction (ND), and electron diffraction (ED). Here, we demonstrate a novel technique to analyz
Externí odkaz:
https://doaj.org/article/281593365aa9498b84dca55ba3114ea7
Autor:
Yunqing Kang, Ovidiu Cretu, Jun Kikkawa, Koji Kimoto, Hiroki Nara, Asep Sugih Nugraha, Hiroki Kawamoto, Miharu Eguchi, Ting Liao, Ziqi Sun, Toru Asahi, Yusuke Yamauchi
Publikováno v:
Nature Communications, Vol 14, Iss 1, Pp 1-1 (2023)
Externí odkaz:
https://doaj.org/article/d367181e88784a9eb818e14091960a45
Autor:
Takafumi Yamamoto, Akira Chikamatsu, Shunsaku Kitagawa, Nana Izumo, Shunsuke Yamashita, Hiroshi Takatsu, Masayuki Ochi, Takahiro Maruyama, Morito Namba, Wenhao Sun, Takahide Nakashima, Fumitaka Takeiri, Kotaro Fujii, Masatomo Yashima, Yuki Sugisawa, Masahito Sano, Yasushi Hirose, Daiichiro Sekiba, Craig M. Brown, Takashi Honda, Kazutaka Ikeda, Toshiya Otomo, Kazuhiko Kuroki, Kenji Ishida, Takao Mori, Koji Kimoto, Tetsuya Hasegawa, Hiroshi Kageyama
Publikováno v:
Nature Communications, Vol 11, Iss 1, Pp 1-8 (2020)
Properties of perovskite oxides can be changed by manipulating anion-vacancy order patterns, but they are difficult to control. Here the authors show strain-induced creation and switching of anion vacancies in perovskite films in which the direction
Externí odkaz:
https://doaj.org/article/f418c9a098634474842061c127d154c5
Autor:
Yuki Shibazaki, Rui Yamada, Junji Saida, Yoshio Kono, Masato Wakeda, Keiji Itoh, Masahiko Nishijima, Koji Kimoto
Publikováno v:
Communications Materials, Vol 1, Iss 1, Pp 1-11 (2020)
The atomic structure of amorphous materials is sensitive to processing history. Here, the simultaneous application of temperature and pressure to a Zr50Cu40Al10 metallic glass causes nanocrystal formation and short- and medium-range ordering, and an
Externí odkaz:
https://doaj.org/article/cdcbf7d4dcb843638af40e912f354036
Autor:
Ashutosh Kumar, Kazutaka Mitsuishi, Toru Hara, Koji Kimoto, Yoshihiro Irokawa, Toshihide Nabatame, Shinya Takashima, Katsunori Ueno, Masaharu Edo, Yasuo Koide
Publikováno v:
Nanoscale Research Letters, Vol 13, Iss 1, Pp 1-8 (2018)
Abstract Inefficient Mg-induced p-type doping has been remained a major obstacle in the development of GaN-based electronic devices for solid-state lighting and power applications. This study reports comparative structural analysis of defects in GaN
Externí odkaz:
https://doaj.org/article/9c99db1d441f4045a868b455934596c7