Proceedings of the Korean Vacuum Society Conference (한국진공학회:학술대회논문집)

The Korean Vacuum Society (한국진공학회)
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Influence of Charge Transport of Pt-CdSe-Pt Nanodumbbells and Pt Nanoparticles/GaN on Catalytic Activity of CO Oxidation

  • Kim, Sun Mi (Graduate School of EEWS (WCU) and NanoCentury KI, KAIST (Korea Advanced Institute of Science and Technology)) ;
  • Lee, Seon Joo (Department of Chemistry, KAIST (Korea Advanced Institute of Science and Technology)) ;
  • Kim, Seunghyun (Department of Physics and GRAST, Chungnam National University) ;
  • Kwon, Sangku (Graduate School of EEWS (WCU) and NanoCentury KI, KAIST (Korea Advanced Institute of Science and Technology)) ;
  • Yee, Kiju (Department of Physics and GRAST, Chungnam National University) ;
  • Song, Hyunjoon (Department of Chemistry, KAIST (Korea Advanced Institute of Science and Technology)) ;
  • Somorjai, Gabor A. (Department of Chemistry, University of California) ;
  • Park, Jeong Young (Graduate School of EEWS (WCU) and NanoCentury KI, KAIST (Korea Advanced Institute of Science and Technology))
  • Published : 2013.02.18
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Abstract

Among multicomponent nanostructures, hybrid nanocatalysts consisting of metal nanoparticle-semiconductor junctions offer an interesting platform to study the role of metal-oxide interfaces and hot electron flows in heterogeneous catalysis. In this study, we report that hot carriers generated upon photon absorption significantly impact the catalytic activity of CO oxidation. We found that Pt-CdSe-Pt nanodumbbells exhibited a higher turnover frequency by a factor of two during irradiation by light with energy higher than the bandgap of CdSe, while the turnover rate on bare Pt nanoparticles didn't depend on light irradiation. We also found that Pt nanoparticles deposited on a GaN substrate under light irradiation exhibit changes in catalytic activity of CO oxidation that depends on the type of doping of the GaN. We suppose that hot electrons are generated upon the absorption of photons by the semiconducting nanorods or substrates, whereafter the hot electrons are injected into the Pt nanoparticles, resulting in the change in catalytic activity. We discuss the possible mechanism for how hot carrier flows generated during light irradiation affect the catalytic activity of CO oxidation.

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