Strain-Induced Tunable Band Gap and Morphology-Dependent Photocurrent in RGO–CdS Nanostructures

In situ CdS nanostructures (nanorods, nanoparticles, nanoclusters) are grown on a reduced graphene oxide (RGO) surface to tune the photocurrent generated due to transfer of excited charge from CdS to RGO. The highest change in photocurrent is achieved in the case of nanoclusters, while nanorods show...

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Published in:Journal of physical chemistry. C 2015-12, Vol.119 (49), p.27749-27758
Main Authors: Mondal, Supriya, Sudhu, Suparna, Bhattacharya, Shatabda, Saha, Shyamal K
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Language:English
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cited_by cdi_FETCH-LOGICAL-a346t-c8b0f9123f456f6808edef2c3c0ad1a83f39f921731f82983e4cee3a23f5ad03
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description In situ CdS nanostructures (nanorods, nanoparticles, nanoclusters) are grown on a reduced graphene oxide (RGO) surface to tune the photocurrent generated due to transfer of excited charge from CdS to RGO. The highest change in photocurrent is achieved in the case of nanoclusters, while nanorods show the lowest. Rietveld analysis has been done to find the microstrain present in three nanocomposites. UV–vis spectroscopy reveals the modulation in band gap due to different growth morphology. From the band structure, it is seen that in nanorod structure strain-induced localized states lower the conduction band which essentially decreases the charge transfer from CdS to RGO, resulting in a smaller change in the photocurrent, while in the case of a nanocluster the photocurrent is maximum due to the lowest strain. This is also consistent with the photoluminescence (PL) quenching as obtained from PL spectra.
doi_str_mv 10.1021/acs.jpcc.5b08116
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title Strain-Induced Tunable Band Gap and Morphology-Dependent Photocurrent in RGO–CdS Nanostructures
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