Kumar, Rahul and Kulriya, Pawan K. and Mishra, Monu and Singh, Fouran and Gupta, Govind and Kumar, Mahesh (2018) Highly selective and reversible NO2 gas sensor using vertically aligned MoS2 flake networks. Nanotechnology, 29 (46). pp. 464001-464010. ISSN 0957-4484

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Abstract

We demonstrate a highly selective and reversible NO2 resistive gas sensor using vertically aligned MoS2 (VA-MoS2) flake networks. We synthesized horizontally and vertically aligned MoS2 flakes on SiO2/Si substrate using a kinetically controlled rapid growth CVD process. Uniformly interconnected MoS2 flakes and their orientation were confirmed by scanning electron microscopy, x-ray diffraction, Raman spectroscopy and x-ray photoelectron spectroscopy. The VA-MoS2 gas sensor showed two times higher response to NO2 compared to horizontally aligned MoS2 at room temperature. Moreover, the sensors exhibited a dramatically improved complete recovery upon NO2 exposure at its low optimum operating temperatures (100 degrees C). In addition, the sensing performance of the sensors was investigated with exposure to various gases such as NH3, CO2, H-2, CH4 and H2S. It was observed that high response to gas directly correlates with the strong interaction of gas molecules on edge sites of the VA-MoS2. The VA-MoS2 gas sensor exhibited high response with good reversibility and selectivity towards NO2 as a result of the high aspect ratio as well as high adsorption energy on exposed edge sites.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s IOP Publishing.
Subjects:	Materials Science Applied Physics/Condensed Matter Nanoscience/ Nanotechnology
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	21 Nov 2019 07:11
Last Modified:	21 Nov 2019 07:11
URI:	http://npl.csircentral.net/id/eprint/3911

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