Quick responding humidity sensor based on polyaniline/reduced graphene oxide composite

Chethan, B and Prasad, V and Mathew, S and Jan, H (2024) Quick responding humidity sensor based on polyaniline/reduced graphene oxide composite. In: Synthetic Metals, 307 .

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Abstract

The relative humidity sensing response of the Polyaniline/ reduced Graphene Oxide (PRGO) composites has been explored in this present research work. For these observations, polyaniline (PANI), synthesised by the chemical oxidative polymerisation process, was physically blended using the different mass ratios of reduced graphene oxide (rGO). By the improved hummers method, graphene oxide (GO) is prepared, adding the minimal quantity of selenium power, and the GO was effectively and facilely reduced to rGO. By adding different weight per cent (wt) of reduced Graphene oxide (rGO) to the polymer matrix, PRGO composites were prepared. Structural and morphological properties of rGO were confirmed by XRD, RAMAN, FTIR, SEM, EDX, and HR-TEM (elementary mapping) characterisations. XRD, FTIR SEM and EDX proficiencies were employed to characterise the PRGO composites. For the humidity sensing determination, the sensing film of the PANI, rGO, and PRGO composites is groomed by loading the sample on an IDT substrate through a drop casting technique. The PRGO-3 composite has shown an epitome response and recovery of 3 and 4 s, respectively. The PRGO-3 composite has the most minored and less real sensitivity with a lower limit of detection (LOD). Also, the prepared PRGO composites have recorded less hysteresis and good linearity and depicted exact stability over PANI and other PRGO composites. The physical parameters for PRGO composites were also calculated to determine the potentiality of a perfect sensor. The sensing mechanism also hashed out based on establishing chemisorption and physisorption layers. © 2024 Elsevier B.V.

Item Type:	Journal Article
Publication:	Synthetic Metals
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Graphene; Humidity sensors; Polymer matrix composites, FTIR; Graphene oxides; Humidity sensing; Humidity sensitivity; Humm method; Limit of detection; Oxide composites; Reduced graphene oxides; Sensing response; XRD, X ray diffraction
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	06 Aug 2024 10:21
Last Modified:	06 Aug 2024 10:21
URI:	http://eprints.iisc.ac.in/id/eprint/85240

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