Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 4, Issue 17, Pages 2919-2925Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz401460j
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Funding
- National Natural Science Foundation of China [11204298, 11274304]
- Innovative Research Support Program (Pilot Model) of the University of Tsukuba, Japan
- Grants-in-Aid for Scientific Research [23340084, 24102702] Funding Source: KAKEN
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The charge separation and recombination processes between CdSe quantum dot (QD) and graphene oxide (GO) composites with linking molecule methylene blue (MB+) were studied by femtosecond transient absorption spectroscopy. Anchoring MB+ molecules on GO results in significant changes in steady-state and transient absorption spectra, where the exciton dissociation time in the CdSe QD-MB+-GO composite was determined to be 1.8 ps. Surprisingly, the ground state bleaching signal increased for MB+-GO complex was found to be 5.2 ps, in relation with electron transfer from QD to GO. On the other hand, the strong electronic coupling between MB center dot-GO radical and GO prolonged charge recombination process (>= 5 ns) in QD-MB+-GO composites. Charge separation and recombination processes at the interface between semiconductor QDs and graphene can thus be modulated by the functionalized dye molecules.
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