Giant Humidity Responsiveness of Platinum Functionalized WS2Nanosheet Based Chemiresistors

Gupta, A and Sakhuja, N and Jha, R and Bhat, N (2020) Giant Humidity Responsiveness of Platinum Functionalized WS2Nanosheet Based Chemiresistors. In: Proceedings of IEEE Sensors, 25-28 October 2020, Rotterdam; Netherlands.

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Abstract

In this paper, WS2 nanosheets (NS) were prepared by the liquid phase exfoliation (LPE) method, and the exfoliated WS2 NS were further functionalized with Pt-nanoparticles (NPs) via the wet chemical approach. The humidity sensing characteristics for both pristine WS2 NS as well as Pt-decorated WS2 NS were recorded at room temperature in moderate relative humidity (RH) range of 25-55. The Pt-decorated WS2 NS based sensors showed a very high response of 4.92 (at 25 RH) to 35,852 (at 55 RH) which is about 1.6X (at 25 RH)-105.1X (at 55 RH) higher than pristine WS2 based devices. The Pt-decorated WS2 sensors also showed a significant improvement in the response time (of the order of �130 seconds) and a notable improvement in the recovery time (of the order of �20 seconds) over its pristine counterpart. Also, the sensitivity of pristine WS2 NS based sensor was 16.5 per RH, which increased to 1,792 per RH upon Pt decoration. All these results collectively suggest that the decoration of WS2 NS by noble metal NP like Pt has a positive impact on humidity sensing properties. © 2020 IEEE.

Item Type:	Conference Paper
Publication:	Proceedings of IEEE Sensors
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	cited By 0; Conference of 2020 IEEE Sensors, SENSORS 2020 ; Conference Date: 25 October 2020 Through 28 October 2020; Conference Code:165760
Keywords:	Humidity sensors; Tungsten compounds, Chemiresistors; Functionalized; High response; Humidity sensing; Humidity sensing property; Pt nanoparticles; Recovery time; Wet-chemical approach, Platinum
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	21 Jan 2021 07:16
Last Modified:	21 Jan 2021 07:16
URI:	http://eprints.iisc.ac.in/id/eprint/67725

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