Nanocrystalline Spinel CoFe2O4 Thin Films Deposited via Microwave-Assisted Synthesis for Sensing Application

Umesh, S and Usha, A and Bailey, K and Sujatha, K and Varadharajaperumal, S and Shivashankar, SA and Raghavan, MS (2022) Nanocrystalline Spinel CoFe2O4 Thin Films Deposited via Microwave-Assisted Synthesis for Sensing Application. In: Journal of Electronic Materials .

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Abstract

This work describes and demonstrates the fabrication of nanocrystalline CoFe2O4 thin films deposited over an oxidised silicon substrate, in a solution medium at ∼ 110°C, via a simple microwave-assisted synthesis process. Films were characterised by x-ray diffraction, scanning electron microscopy, atomic force microscopy, x-ray photoelectron spectroscopy, FTIR and Raman spectroscopy. A platinum electrode was patterned to form the sensor device using optical lithography. The CoFe2O4 sensor so fabricated displays excellent sensitivity to SO2 at a concentration of 3.5 ppm yielding a 350% response at 120°C, with rapid response (10 s) and recovery (20 s), and with a detection limit of 250 ppb. In addition, the film has very good selectivity over H2S, NH3, NO2, and CH4. The work illustrates the potential advantage of nanocrystalline ferrite thin films for the detection of toxic gases at low detection limits and at a moderate sensor temperature. Graphical Abstract: Cobalt Ferrite Thin films for SO2 sensing at sub-ppm concentration with quick responses and recovery

Item Type:	Journal Article
Publication:	Journal of Electronic Materials
Publisher:	Springer
Additional Information:	The copyright for this article belongs to the Springer.
Keywords:	Ammonia; Cobalt; Cobalt compounds; Electrodes; Ferrite; Fourier transform infrared spectroscopy; Iron compounds; Nanocrystals; Photolithography; Scanning electron microscopy; Silicon oxides; Substrates; Thin film circuits; X ray photoelectron spectroscopy, Cobalt ferrites; Ferrites thin films; Level sensing; Microwave assisted synthesis; Microwave-assisted; Nanocrystalline spinels; Ppb level sensing; Ppb levels; SO 2 sensor; Thin-films, Thin films
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	28 Jul 2022 05:58
Last Modified:	28 Jul 2022 05:58
URI:	https://eprints.iisc.ac.in/id/eprint/75021

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