期刊
NANO LETTERS
卷 11, 期 5, 页码 2126-2132出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl200718w
关键词
electron transfer; Marcus theory; solvent reorganization energy; electronic coupling; spacer length; anchor groups
类别
资金
- Cornell Center for Materials Research (CCMR)
- National Science Foundation [DMR 0520404]
- King Abdullah University of Science and Technology (KAUST) [KUS-C1-018-02]
The roles of solvent reorganization energy and electronic coupling strength on the transfer of photoexcited electrons from PbS nanocrystals to TiO2 nanoparticles are investigated. We find that the electron transfer depends only wealdy on the solvent, in contrast to the strong dependence in the nanocrystal-molecule system. This is ascribed to the larger size of the acceptor in this system, and is accounted for by Marcus theory. The electronic coupling of the PbS and TiO2 is varied by changing the length, aliphatic and aromatic structure, and anchor groups of the linker molecules. Shorter linker molecules consistently lead to faster electron transfer. Surprisingly, linker molecules of the same length but distinct chemical structures yield similar electron transfer rates. In contrast, the electron transfer rate can vary dramatically with different anchor groups.
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