期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 136, 期 6, 页码 2208-2211出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja4106418
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-FG02-06ER15788]
- UNC EFRC: Center for Solar Fuels, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0001011]
- Department of Defense, Air Force Office of Scientific Research, National Defense Science and Engineering Graduate (NDSEG) Fellowship [32 CFR 168a, FA9550-11-C-0028]
Interfacial electron transfer to and from conductive Sn-doped In2O3 (ITO) nanoparticles (NPs) in mesoporous thin films has been investigated by transient absorption measurements using surface-bound [Ru-II(bpy)(2)(dcb)](2+) (bpy is 2,2'-bipyridyl and dcb is 4,4'-(COOH)(2)-2,2'-bipyridyl). Metal-to-ligand charge transfer excitation in 0.1 M LiClO4 MeCN results in efficient electron injection into the ITO NPs on the picosecond time scale followed by back electron transfer on the nanosecond time scale. Rates of back electron transfer are dependent on thermal annealing conditions with the rate constant increasing from 1.8 x 10(8) s(-1) for oxidizing annealing conditions to 8.0 x 10(8) s(-1) for reducing conditions, presumably due to an enhanced electron concentration in the latter.
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