Mahapatra, Preeti Lata and Das, Sagnik and Mondal, Partha Pratim and Das, Tanushri and Saha, Debdulal and Pal, Mrinal (2021) Microporous copper chromite thick film based novel and ultrasensitive capacitive humidity sensor. Journal of Alloys and Compounds, 859. Art No-157778. ISSN 0925-8388

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Abstract

In this paper we report to have developed a microporous Copper Chromite (CuCr2O4) thick film based capacitive humidity sensor that exhibits excellent response in the range of 1%-98% RH at room temperature. CuCr2O4 spinel nanopowder was synthesized by a facile sol-gel technique. The as prepared CuCr2O4 nanopowder was screen printed to develop a thick film and it was sandwiched between two parallel electrodes of silver and copper to develop a parallel plate capacitive sensor. The CuCr2O4 nanoparticles and the thick film were well characterized by XRD, XPS, FTIR spectroscopy, Raman Spectroscopy, FESEM, TEM, EDX, and contact angle measurement. Various electrical parameters of the sensor, viz. Capacitance (Cp), Dissipation (D), Conductance (Gp), Susceptance (Bp), and admittance (Y) were measured at different frequencies ranging from 100 Hz to 1 MHz. It was observed that the optimum operating frequency is 1 kHz. At this frequency the sensor exhibited very high sensitivity, especially in the low %RH range of 1%-40% (similar to 640 pF change in capacitance), low dissipation loss (<2 for all %RH range), and fast response (similar to 3.6 s) and recovery times (128 s). Further, the sensor exhibits long-term stability (at least 6 months). The sensor may find commercial applications in food packaging, tea industry, hospitals, power plants etc. (C) 2020 Elsevier B.V. All rights reserved.

Item Type:	Article
Subjects:	Electronics
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	14 Dec 2021 07:03
Last Modified:	14 Dec 2021 07:03
URI:	http://cgcri.csircentral.net/id/eprint/5233

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