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Exfoliated \(\hbox {WS}_{2}\) nanosheets: optical, photocatalytic and nitrogen-adsorption/desorption characteristics

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Abstract

In this work, we report on structural, optical, photocatalytic and nitrogen adsorption–desorption characteristics of \(\hbox {WS}_{2 }\) nanosheets developed via a hydrothermal route. X-ray diffraction (XRD) studies have revealed a hexagonal crystal structure, whereas nanodimensional sheets are apparently observed in scanning and transmission electron microscopy (SEM and TEM) micrographs. As compared to the bulk counterpart, the \(\hbox {WS}_{2}\) nanosheets exhibited a clear blue shift. Through Brunauer–Emmett–Teller (BET) surface area analysis, average surface area, pore volume and pore size of the NSs were calculated as 211.5 \(\hbox {m}^{2}~\hbox {g}^{-1}\), 0.433 cc \(\hbox {g}^{-1}\) and 3.8 nm, respectively. The photocatalytic activity of the \(\hbox {WS}_{2}\) nanosheets was also examined with malachite green (MG) as the target dye under both UV and day light (visible) illumination conditions. Accordingly, a degradation efficiency as high as 67.4 and 86.6% were witnessed for an irradiation time duration of 60 min. The nano-\(\hbox {WS}_{2}\) systems have immense potential in optoelectronics, solid-lubrication and other next generation elements.

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Acknowledgements

We acknowledge IUAC, New Delhi, for the financial support (Project: UFR-56322/2014 and 62312/2017). The initial assistance of Ms Mayuri Bora during experimental work is acknowledged. Further, we thank SAIC, Tezpur University, for extending several analytical facilities.

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  1. Nanoscience and Soft Matter Laboratory, Department of Physics, Tezpur University, PO: Napaam, Tezpur, Assam, 784028, India

    S J Hazarika & D Mohanta

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  1. S J Hazarika
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  2. D Mohanta
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Correspondence to D Mohanta.

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Hazarika, S.J., Mohanta, D. Exfoliated \(\hbox {WS}_{2}\) nanosheets: optical, photocatalytic and nitrogen-adsorption/desorption characteristics. Bull Mater Sci 41, 163 (2018). https://doi.org/10.1007/s12034-018-1679-y

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  • DOI: https://doi.org/10.1007/s12034-018-1679-y

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