Hiroshi Yageta
NEC
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Publication
Featured researches published by Hiroshi Yageta.
Synthetic Metals | 1997
Masaharu Satoh; Hitoshi Ishikawa; Hiroshi Yageta; Kosuke Amano; Etsuo Hasegawa
We have succeeded in manufacturing a chip-type tantalum capacitor using conducting polypyrrole (PPy) as a solid electrolyte. PPy was fabricated by the direct polymerization of pyrrole on the dielectric layer of the capacitor. Diffuse reflection-absorption FT-IR spectroscopy indicates that the PPy has an oxidized structure with covalently bonded oxygen, which differs from native PPy synthesized under oxygen-free conditions. We investigated the thermostability of oxidized and native PPys in an inert atmosphere. The room temperature conductivity of both PPys remained unchanged despite annealing at up to 260°C. Gas chromatography-mass spectrometry indicated that the elimination of dopants begins at 330°C and the main chain decomposes at 480°C. We observed no difference in the thermostability of oxidized and native PPy. These results prove that PPy in a sealed container can be adapted for use as a material for electronic devices that need to remain stable at high temperatures. A sealed tantalum capacitor made using PPy was able to operate continuously at 125°C.
Archive | 2004
Hiroshi Yageta; Makihiro Otohata
Archive | 2002
Hiroshi Yageta; Makihiro Otohata; Nobuaki Yoshioka
Archive | 1998
Kosuke Amano; Yutaka Bannai; Hiroshi Yageta; Masaharu Satoh; Etsuo Hasegawa
Archive | 2005
Makihiro Otohata; Hiroshi Yageta
Archive | 2002
Hiroshi Yageta; Hidemasa Kawai; Masato Shirakata; Tetsuya Takashima; Ikuo Kojima; Norihide Ohyama; Hiroyuki Iizuka
Archive | 2008
Masatomo Mizuta; Kazuaki Utsumi; Makihiro Otohata; Hiroshi Yageta
Archive | 2005
Kentaro Nakahara; Masaharu Satoh; Shigeyuki Iwasa; Hiroshi Yageta; Yutaka Bannai; Yukiko Morioka; Etsuo Hasegawa
Archive | 2004
Makihiro Otohata; Hiroshi Yageta
Archive | 2000
Masaharu Satoh; Norihide Ohyama; Masato Shirakata; Tomokazu Kumeuchi; Hiroshi Yageta; Ryuichi Shimizu; Yutaka Bannai