1T-Phase Titanium Disulfide Nanosheets for Sensing H2S and O2

Sakhuja, N and Jha, RK and Chaurasiya, R and Dixit, A and Bhat, N (2020) 1T-Phase Titanium Disulfide Nanosheets for Sensing H2S and O2. In: ACS Applied Nano Materials, 3 (4). pp. 3382-3394.

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Abstract

A chemiresistive, 1T-TiS2 nanosheet (TNS) based gas sensor has been developed, and its ultrahigh sensitivity toward hydrogen sulfide (H2S) and oxygen (O2) gas at room temperature has been experimentally demonstrated. The sensor displayed room-temperature detection with a maximum response of 395% to 4 ppm H2S (reducing gas) in dry air and a response of 234% to 100% oxygen (oxidizing gas) in ambient conditions. The H2S and O2 sensing in humid environment (40% and 80%) has also been demonstrated so as to ensure the reliable operation of sensor in real-time applications. The ultrasensitive nature and linear behavior of the sensor enable it to operate reliably in the wide range of 300 ppb to 4 ppm H2S and 1% to 100% oxygen. Density functional theory (DFT) simulations were carried out to study the structural and electronic properties of TNS. Adsorption behavior of these gas molecules on TNS nanosheets was also studied theoretically. A plausible sensing mechanism based on the theoretical model has been detailed, and interestingly, it suggests physisorption phenomena between the adsorbate and adsorbent which enables fast recovery of the sensor without any external stimulation. The rather low lower limit of detection (LLoD) for H2S and O2 reported here, specifically at room temperature, is unique and competes favorably with reported studies. This outstanding sensor performance can be attributed to small adsorption energy and van der Waals interaction between analyte and the receptor

Item Type:	Journal Article
Publication:	ACS Applied Nano Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to the American Chemical Society
Keywords:	Chemical sensors; Density functional theory; Electronic properties; Gas detectors; Gases; Hydrogen sulfide; Nanosheets; Oxygen; Physisorption; Sulfur compounds; Sulfur determination; Van der Waals forces, Liquid exfoliations; Lower limit of detections; Real-time application; Room temperature detection; Structural and electronic properties; Theoretical modeling; Ultra-high-sensitivity; Van Der Waals interactions, Titanium compounds
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	01 Feb 2023 06:22
Last Modified:	01 Feb 2023 06:22
URI:	https://eprints.iisc.ac.in/id/eprint/79659

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