Bulk and Few-Layer 2D, p-MnPS3 for Sensitive and Selective Moisture Sensing

Kumar, R and Jenjeti, RN and Sampath, S (2019) Bulk and Few-Layer 2D, p-MnPS3 for Sensitive and Selective Moisture Sensing. In: Advanced Materials Interfaces, 6 (20).

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Abstract

In this study, the humidity sensing properties of two dimensional (2D), few-layer p-MnPS3 is explored. Few-layer of p-MnPS3 is obtained by exfoliating highly oriented bulk crystals and assembled as thin films on various substrates. The performance of p-MnPS3 thin film sandwiched between two similar metal electrodes (Ag or Au) toward various levels of moisture under ambient conditions is investigated. The results depict that p-MnPS3 nanosheets based humidity sensors are highly sensitive and show fast response and recovery times with good repeatability. It is observed that the resistance of the films decreases five to six orders of magnitude with a change in relative humidity (RH) from 0% to 98%. A fast response time of ≈1–2 s and recovery time of ≈4 s are observed. The mechanism of sensing is understood based on AC impedance spectroscopy. Extrinsic mechanism such as filamentary conduction is ruled out based on the data obtained using devices with different channel lengths. Ionic conduction within the channel is mainly responsible for the observed increase in conductivity in presence of moisture. The humidity sensors are shown to be effective in monitoring human respiration as well as water evaporation on skin without physical contact.

Item Type:	Journal Article
Publication:	Advanced Materials Interfaces
Publisher:	Wiley-VCH Verlag
Additional Information:	The copyright for this article belongs to Wiley-VCH Verlag.
Keywords:	Humidity sensors; Moisture, Ac impedance spectroscopy; Extrinsic mechanisms; Filamentary conduction; Humidity sensing; Humidity sensing property; layered phosphochalcogenide; Orders of magnitude; Two Dimensional (2 D), Thin films
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	05 Jan 2023 09:32
Last Modified:	05 Jan 2023 09:32
URI:	https://eprints.iisc.ac.in/id/eprint/78783

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