Nanoengineered conductive polyaniline enabled sensor for sensitive humidity detection

Sandhu, SS and Kumar, S and Augustine, S and Saha, U and Arora, K and Bayan, S and Ray, SK and Puri, NK and Malhotra, BD (2020) Nanoengineered conductive polyaniline enabled sensor for sensitive humidity detection. In: IEEE Sensors Journal, 20 (21). pp. 12574-12581.

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Abstract

We report results of the studies relating to the fabrication of a paper-based humidity sensing element comprising a nanostructured polyaniline (PANI) coating on a filter paper substrate. The electrical conductivity of the PANI integrated conductive paper increases from 1.9× 10-6 Scm-1 to 1.1× 10-1 Scm-1 on modification of the polymerization protocol. This increase in conductivity is ascribed to the change in morphology of the PANI coating from nanogranular (Ng) to partially nanofibrous (pNf). We investigate the effect of observed morphologies of PANI-paper composites on their resistive-type humidity sensing performances. The partially nanofibrous (pNf) PANI-paper exhibits a bimodal humidity response due to polymer-swelling effect at higher humidity (≥ 55% RH). However, the nanogranular (Ng) PANI-paper yields a unimodal, linear humidity response within the humidity range, 16-96.2% RH, with a sensitivity of 9.79 kΩ% RH (R2≈ 0.996). Hence, the Ng PANI-paper is a promising alternative to the conventional humidity sensors fabricated on ITO glass/bare glass/PET substrates.

Item Type:	Journal Article
Publication:	IEEE Sensors Journal
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Coatings; Humidity sensors; ITO glass; Morphology; Nanofibers; Polyaniline; Substrates, Conductive papers; Conductive polyaniline; Electrical conductivity; Humidity detection; Humidity response; Humidity sensing; Polyaniline coatings; Polymer swelling, Paper
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	15 Feb 2023 09:25
Last Modified:	15 Feb 2023 09:25
URI:	https://eprints.iisc.ac.in/id/eprint/80170

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