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Issue 44, 2017
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Band edge tuned ZnxCd1−xS solid solution nanopowders for efficient solar photocatalysis

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Abstract

This work highlights the synthesis of zinc blende ZnxCd1−xS ternary solid solutions with a tunable bandgap. Composition dependent band gaps are realized due to the effective band edge tuning of the solid solutions which in turn show decent photocatalytic behaviour. The bandgap of ZnxCd1−xS increases as Zn composition increases. It is interesting to note that the highest catalytic activity is observed for Zn0.8Cd0.2S (Eg = 2.83 eV) in the visible spectra due to the presence of defect states in the bandgap around 2.35 eV which has been explicated according to the results of photoluminescence spectra. Density of states (DOS) analysis provides further theoretical insight into the more negative conduction band edge for x = 0.8 than other samples. It also determines generation of intermediate states due to sulfur vacancy which is responsible for more electron–hole generation and the highest rate of Methyl Orange (MO) degradation under natural sunlight irradiation.

Graphical abstract: Band edge tuned ZnxCd1−xS solid solution nanopowders for efficient solar photocatalysis

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Publication details

The article was received on 14 Sep 2017, accepted on 17 Oct 2017 and first published on 23 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP06305A
Citation: Phys. Chem. Chem. Phys., 2017,19, 29998-30009
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    Band edge tuned ZnxCd1−xS solid solution nanopowders for efficient solar photocatalysis

    S. Ghosh, S. Sarkar, B. K. Das, D. Sen, M. Samanta and K. K. Chattopadhyay, Phys. Chem. Chem. Phys., 2017, 19, 29998
    DOI: 10.1039/C7CP06305A

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