Kim, Sun Mi Park, Dahee Yuk, Youngji Kim, Sang Hoon Park, Jeong Young 2024-01-20T12:03:21Z 2024-01-20T12:03:21Z 2021-09-01 2013-07 1359-6640 https://pubs.kist.re.kr/handle/201004/127941 We report the hot carrier-driven catalytic activity of two-dimensional arrays of Pt nanoparticles on GaN substrate under light irradiation. In order to elucidate the effect of a hot carrier in a catalytic chemical reaction, the CO oxidation reaction was carried out on Pt nanoparticles on p-and n-type GaN under light irradiation. Metal catalysts composed of Pt nanoparticles were prepared using two different preparation methods: the one-pot polyol reduction and arc plasma deposition methods. Under light irradiation, the catalytic activity of the Pt nanoparticles supported on GaN exhibited a distinct change depending on the doping type. The catalytic activity of the Pt nanoparticles on the n-doped GaN wafer decreased by 8-28% under light irradiation, compared to no irradiation (i.e., in the dark), while the Pt nanoparticles on the p-doped GaN wafer increased by 11-33% under light irradiation, compared to no irradiation. The catalytic activity increased on the smaller Pt nanoparticles, compared to the larger nanoparticles, presumably due to the mean free path of hot carriers. Based on these results, we conclude that the flow of hot carriers generated at the Pt-GaN interface during light irradiation is responsible for the change in catalytic activity on the Pt nanoparticles. English ROYAL SOC CHEMISTRY METAL-SUPPORT INTERACTIONS CO OXIDATION PLATINUM NANOPARTICLES CARBON-MONOXIDE ELECTRON FLOW SURFACE SIZE GENERATION DIFFUSION NANODIODE Influence of hot carriers on catalytic reaction; Pt nanoparticles on GaN substrates under light irradiation Article 10.1039/c2fd20133j 1 FARADAY DISCUSSIONS, v.162, pp.355 - 364 FARADAY DISCUSSIONS 162 355 364 scie scopus 000321591000020 2-s2.0-84884862545 Chemistry, Physical Chemistry Article METAL-SUPPORT INTERACTIONS CO OXIDATION PLATINUM NANOPARTICLES CARBON-MONOXIDE ELECTRON FLOW SURFACE SIZE GENERATION DIFFUSION NANODIODE