Poisson-distributed electron-transfer dynamics from single quantum dots to C60 molecules.

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摘要：

Functional quantum dot (QD)-based nanostructures are often constructed through the self-assembly of QDs with binding partners (molecules or other nanoparticles), a process that leads to a statistical distribution of the number of binding partners. Using single QD fluorescence spectroscopy, we probe this distribution and its effect on the function (electron-transfer dynamics) in QDC60 complexes. Ensemble-averaged transient absorption and fluorescence decay as well as single QD fluorescence decay measurements show that the QD exciton emission was quenched by electron transfer from the QD to C60 molecules and the electron-transfer rate increases with the C60-to-QD ratio. The electron-transfer rate of single QDC60 complexes fluctuates with time and varies among different QDs. The standard deviation increases linearly with the average of electron-transfer rates of single QDC60 complexes, and the distributions of both quantities obey Poisson statistics. The observed distributions of single QDC60 complexes a...

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关键词：

quantum dots fullerene interfacial electron transfer single particle spectroscopy

DOI：

10.1021/nn1028828

被引量：

146

年份：

2011