Nanoheterostructures consisting of CdS nanorods (NRs) and nanospheres (NSs) with gold nanoparticles (NPs) were synthesized by a phase transfer method. A considerable enhancement in the luminescence intensity around 9-fold and 5-fold was observed for the CdS (NR)/Au and CdS (NS)/Au nanocomposite, respectively, with respect to the bare CdS. When compared with the single-component bare CdS counterpart a substantial blue shift in the emission peak maximum was observed along with a decrease in the excited state lifetime. The plasmons of the Au NPs collectively interact with the excitons of the CdS NRs and NSs which induces the enhancement of the luminescence by reducing the trap states. Time-resolved emission studies (TRESs) of the CdS/Au nanocomposite clearly resolved the band edge and trap state emission and also clearly revealed that the former has considerably larger contribution to the emission than the latter.
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Shanmugapriya et al. (2013) studied this question.
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