2D-MoSe2/0D-ZnO nanocomposite for improved H2S gas sensing in dry air ambience

Jha, RK and Nanda, A and Yadav, A and Sai, R and Bhat, N (2022) 2D-MoSe2/0D-ZnO nanocomposite for improved H2S gas sensing in dry air ambience. In: Journal of Alloys and Compounds, 926 .

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Abstract

In this paper, we report on a micro-sensor employing two-dimensional (2D)- zero-dimensional (0D) heterostructure based on MOSe2/ZnO (fabricated by a novel Complementary Metal Oxide Semiconductor (CMOS) compatible microwave-irradiation-assisted solvothermal route) as a receptor. Density Functional Theory (DFT) calculations show that the heterostructure is more favorable to the adsorption of hydrogen sulfide (H2S) gas than the pristine 2D nanosheets. Experimentally, the device demonstrates sensitivity in the ultra-low concentration H2S range (i.e. 200 ppb � 6.1 ppm), and response of as high as 9.08 (200 ppb) - 186.91 (6.1 ppm) could be obtained repeatably with decent signal-to-noise ratio and response/recovery time (~600 sec). The device stands well on various sensor parameter tests including absolute response percentage, lower limit of detection (LOD), repeatability, reproducibility, hysteresis error, etc. A sensing mechanism based on Wolkentein's model is proposed to understand the detection behavior of the device. © 2022 Elsevier B.V.

Item Type:	Journal Article
Publication:	Journal of Alloys and Compounds
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to elsevier.
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	06 Sep 2022 06:24
Last Modified:	06 Sep 2022 06:24
URI:	https://eprints.iisc.ac.in/id/eprint/76426

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