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444 results on '"Yamaji, Minoru"'

17. 低電力・広域ネットワークLoRaWANの性能評価実験

Author

NISHIDA, Shinichi, primary, NAKAZAWA, Nobuaki, additional, OKU, Hiroyuki, additional, YAMAJI, Minoru, additional, KAWAI, Takahiko, additional, MOTEGI, Kazuhiro, additional, SHIRAISHI, Yoichi, additional, ARAKI, Mikiya, additional, IWANAMI, Masashi, additional, and MITA, Tetsuya, additional

Published
2023
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29. Fabrication and characterization of thin-film field-effect transistors with alkyl-phenyl[n]phenacenes (n = 4–6).

Author

Zhang, Yanting, Eguchi, Ritsuko, Okamoto, Hideki, Goto, Kenta, Tani, Fumito, Yamaji, Minoru, Goto, Hidenori, and Kubozono, Yoshihiro

Abstract

Alkyl-phenyl[n]phenacenes (n = 4–6) are newly synthesized molecules, in which two types of alkyl substituents, decyl and tetradecyl groups, are added to the benzene core frameworks, [n]phenacenes. These include: 2-decyl-8-phenyl[4]phenacene (PhC10-CHR), 3-tetradecyl-8-phenyl[4]phenacene (PhC14-CHR), 3-decyl-10-phenyl[5]phenacene (PhC10-PIC), 3-tetradecyl-10-phenyl[5]phenacene (PhC14-PIC), 2-decyl-10-phenyl[6]phenacene (PhC10-FUL), and 2-tetradecyl-10-phenyl[6]phenacene (PhC14-FUL). [4]phenacene, [5]phenacene, and [6]phenacene are named "chrycene," "picene," and "fulminene," respectively. In this study, field-effect transistors (FETs) using thin films of the above molecules were fabricated with SiO2 and ZrO2 gate dielectrics, and their p-channel transport properties were fully investigated to clarify whether these molecules are available for FET devices. Among these molecules, the PhC10-PIC thin-film FET with ZrO2 provides a higher field-effect mobility (μ) compared with other molecules, which can reach up to 1.66 cm2 V−1 s−1. This paper discusses a design strategy for phenacene-type molecules for high-performance thin-film FET. [ABSTRACT FROM AUTHOR]

Published
2022
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41. Superconductivity in alkali-metal-doped picene

Author

Mitsuhashi, Ryoji, Suzuki, Yuta, Yamanari, Yusuke, Mitamura, Hiroki, Kambe, Takashi, Ikeda, Naoshi, Okamoto, Hideki, Fujiwara, Akihiko, Yamaji, Minoru, Kawasaki, Naoko, Maniwa, Yutaka, and Kubozono, Yoshihiro

Subjects
Thin films -- Magnetic properties -- Analysis, Crystals -- Structure, Clathrate compounds -- Magnetic properties -- Analysis, Electrical conductivity -- Analysis, Hydrocarbons -- Magnetic properties -- Analysis, Dielectric films -- Magnetic properties -- Analysis, Superconductors -- Magnetic properties -- Analysis, Boron nitride -- Magnetic properties -- Analysis, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Efforts to identify and develop new superconducting materials continue apace, motivated by both fundamental science and the prospects for application. For example, several new superconducting material systems have been developed in the recent past, including calcium-intercalated graphite compounds (1), boron-doped diamond (2) and-most prominently-iron arsenides such as [LaO.sub.1-x][F.sub.x]FeAs (ref. 3). In the case of organic superconductors, however, no new material system with a high superconducting transition temperature ([T.sub.c]) has been discovered in the past decade. Here we report that intercalating an alkali metal into picene, a wide-bandgap semiconducting solid hydrocarbon, produces metallic behaviour and superconductivity. Solid potassium-intercalated picene ([K.sub.x]picene) shows [T.sub.c] values of 7K and 18 K, depending on the metal content. The drop of magnetization in [K.sub.x]picene solids at the transition temperature is sharp (, The metal doping of organic molecular compounds and graphites, solids with p-electron networks, has been extensively studied in the search for novel physical properties, such as metallic behaviour and superconductivity [...]

Published
2010
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49. S-S bond mesolysis in [alpha], [alpha']-dinaphthyl disulfide radical anion generated during [gamma]-radiolysis and pulse radiolysis in organic solution

Author

Yamaji, Minoru, Tojo, Sachiko, Takehira, Kazuyuki, Tobita, Seiji, Fujitsuka, Mamoru, and Majima, Tetsuro

Subjects
Radiolysis -- Usage, Sulfides -- Chemical properties, Sulfides -- Thermal properties, Density functionals -- Usage, Chemicals, plastics and rubber industries
Abstract

A study of the dissociation mechanism of the S-S bond in the [alpha],[alpha']-dinaphthyl disulfide radical anion (NpSSNp.-) in organic solution on the bases of transient absorption measurements and DFT calculations is presented. It was seen that NpSSNp.- undergoes S-S bond cleavage to form NpS and Np[S.sup.-] with a first-order rate constant in the magnitude of [10.sup.6][s.sup.-1] in solution at room temperature.

Published
2006

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