期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 118, 期 36, 页码 21275-21280出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp507156p
关键词
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资金
- Army Research Office [55748CH]
- ABS Corp. through ABS Graduate Fellowships in the Energy Research Program at the University of Virginia
Photoluminescence spectroscopy was employed to study the photoinduced charge transfer between TiO2 nanoparticles and Au nanoparticles under vacuum. We found that small coverages of 3 nm Au nanoparticles deposited on TiO2 significantly diminish the 540 nm (2.3 eV) photoluminescence emission from TiO2 because of the redistribution of the photoexcited charge to Au nanoparticles that are capable of accepting negative charges behind the Schottky barrier. The lack of development of the photoluminescence emission of Au/TiO2 during continuous UV irradiation occurs because of a short circuit established through Au nanoparticles in which transferred electrons in Au recombine nonradiatively with holes in TiO2. The photoexcited electron transfer from TiO2 to the Au nanoparticles occurs beyond the Au particle perimeter over a distance of at least 4 nm. The quenching of photoluminescence by resonance energy transfer from TiO2 to Au nanoparticles is unimportant as Au plasmonic absorption is not observed.
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