Catalytic property of platinum nanoparticle films using a few tens keV electron beam induced reduction method

Hakoda, Teruyuki; Yamamoto, Shunya; Shimoyama, Iwao   ; Aritani, Hirofumi*; Yoshikawa, Masahito

We previously observed that platinum nanoparticles films was produced on the surface of a solution containing 1 mmol/L PtCl ions and 0.5-20v% ethanol by irradiating with a few tens keV electron beams (EB). In the present study, the platinum films were deposited to tungsten trioxide (WO) films, which show hydrogen gasochromic property, to examine the catalytic property of the platinum films. The transmittance of 700-nm lights through the prepared (Pt/WO) films decreased in exposing to 1v% hydrogen/nitrogen gas. This decrease suggests the production of HxWO films through the reaction of WO films with hydrogen atoms dissociated over Pt nanoparticles. The Pt nanoparticle films prepared using a few tens keV EB induced reduction method were observed to have catalytic activity.