期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 118, 期 32, 页码 18445-18452出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp5061446
关键词
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资金
- ANR project NAPHO [ANR-08-NANO-054]
- European STREP ARTIST [FP7 243421]
- French RENATECH network
A new class of optoelectronic nanodevices consisting of OD semiconductor nanocrystals and 2D single graphene layers is attracting much attention. In particular, such a system may be used to investigate and control the transfer of energy and charge in low-dimensional systems. To this end, the fluorescence dynamics of individual colloidal quantum dots (QDs) on graphene are investigated on both the 10(-9)-10(-8) s time scale (fluorescence lifetime) and the 10(0)-10(2) s time scale (blinking statistics) in this paper. We find that (i) a nonradiative energy transfer rate of approximate to 5 X 10(8) s(-1) is obtained from the reduced lifetimes of QDs on graphene as opposed to those on insulating substrates such as glass; (ii) QDs still exhibit fluorescence intermittency (blinking) on graphene; (iii) the cumulative distribution functions of the off times may be described by power-law statistics; (iv) QD coupling to graphene increases the time spent in the on state while the time spent in the off state remains relatively unchanged; and (v) the fluorescence emission spectrum of the QDs is practically unaltered by the QD-graphene coupling.
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