Two-dimensional, few-layer NiPS3 for flexible humidity sensor with high selectivity

Jenjeti, Ramesh Naidu and Kumar, Rajat and Sampath, S (2019) Two-dimensional, few-layer NiPS3 for flexible humidity sensor with high selectivity. In: JOURNAL OF MATERIALS CHEMISTRY A, 7 (24). pp. 14545-14551.

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Abstract

Chemically and electrically sensitive two-dimensional (2D) nanomaterials are of immense interest as probing electrodes for wearable electronic devices. A new family of two dimensional (2D) layered materials, namely metal phosphochalcogenides (MPX3), are potential candidates towards the development of sensors for various analytes. Herein, we demonstrate the ability of few-layer NiPS3 nanosheets for humidity sensing by fabricating a cost-effective, flexible sensor device. The results indicate that the NiPS3 nanosheet-based humidity sensors possess high sensitivity with a responsivity of similar to 10(6), superior selectivity, and most importantly, rapid response, recovery times and good reproducibility. Response times of similar to 1-2 s at low humidity levels and similar to 3 s at high humidity levels with recovery times of similar to 2-3 s are observed. The device was tested in both flat and bent states, causing no prominent changes in the response; hence, the sensor is an excellent candidate for use in flexible devices. The characteristics of the NiPS3-based sensor were further investigated using complex impedance studies and in situ Raman spectroscopy to understand the sensing mechanism. The fast response and recovery associated with the NiPS3-based humidity sensors allow real time monitoring of human respiration and water evaporation on skin. These humidity sensors can also be utilized for non-contact analysis and hence will be an attractive candidate for health and environmental monitoring.

Item Type:	Journal Article
Publication:	JOURNAL OF MATERIALS CHEMISTRY A
Publisher:	ROYAL SOC CHEMISTRY
Additional Information:	copyright for this article belongs to ROYAL SOC CHEMISTRY
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	22 Aug 2019 10:43
Last Modified:	22 Aug 2019 10:43
URI:	http://eprints.iisc.ac.in/id/eprint/63317

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