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Sasaki, Ichiro; Hanaoka, Hirofumi*; Yamada, Keiichi*; Watanabe, Shigeki; Sugo, Yumi; Ohshima, Yasuhiro; Ishioka, Noriko
no journal, ,
no abstracts in English
Takahashi, Ayaka*; Sugawara, Toshifumi*; Shimada, Akihiko; Hakoda, Teruyuki; Sugimoto, Masaki; Aritani, Hirofumi*; Yoshikawa, Masahito
no journal, ,
Recently, it is appeared that gold nano particles have catalytic activity of CO oxidation, though bulk gold does not have. The representative method to fabricate catalyst, impregnation, is rather complex method. This method is divided into sink, evaporation with mixing, drying, high temperature baking. If gold nano particle layer is fabricated, gold nano particle catalyst is fabricated only transferring to catalyst support material. Thus, we try to fabricate gold nano particle layer by electron beam irradiation from tetrachloroauric (3) acid solution, by radiation reduction method. One mmol/L tetrachloroauric (3) acid solution including 0.5 - 20% of ethanol was irradiated by electron beam (55 keV). Red, thin film-like-float (layer) is generated. This layer is measured by TEM and XPS. It is appeared that about 5 nm of nano particle (supposed to gold) is existed and most of the gold in the layer is zero valence (metallic) gold. So we show that gold nano particle layer is fabricated from tetrachloroauric (3) acid solution by radiation reduction method.
Kimata, Tetsuya*; Kato, Sho*; Yamaki, Tetsuya; Yamamoto, Shunya; Hakoda, Teruyuki; Kobayashi, Tomohiro*; Suzuki, Akihiro*; Terai, Takayuki*
no journal, ,
Platinum (Pt) nanoparticles prepared by ion implantation in a glassy carbon (GC) substrate exhibited high activity and durability as oxygen reduction reaction (ORR) catalyst. This result would originate from chemical and electronic interaction between the Pt atoms at the particle surface and the lattice defects in the GC substrate introduced by the ion implantation. In this study, therefore, we sputtered Pt nanoparticles on the Ar-ion-irradiated GC substrate and then investigated their catalytic activity and electronic structure in terms of the effects of the irradiation defects in the substrate. The Ar-ion irradiation of the GC substrate was found to improve the ORR activity in an acid solution and to promote the formation of the Pt-C bonding at the interface.
Fukasawa, Hideyuki*; Hasegawa, Shin; Maekawa, Yasunari
no journal, ,
Polymer membranes are reinforced mechanically by the hybridization with inorganic nano-particles. We previously reported the successful preparation of highly conducting and mechanically stable graft-type PEMs based on an aromatic hydrocarbon polymer, poly(ether ether ketone) (PEEK). Therefore we synthesized graft-type hybrid-PEEK PEMs by the radiation-induced graft polymerization of divinylbenzene and ethyl p-styrenesulfonate onto the hybrid films consisting of PEEK and inorganic nanoparticles such as silica. The hybrid PEEK PEMs with 3% silica nano-particles showed higher proton conductivity than the original PEEK PEMs at high temperature and low relative humidity (80
C, 30%RH). This is because the silica nano-particles enhance water retention ability in the PEEK-PEMs to increase the proton conductivity at dry conditions.