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Correlating defect induced ferromagnetism and gas sensing properties of undoped tin oxide sensors

Kamble, Vinayak B and Umarji, Arun M (2014) Correlating defect induced ferromagnetism and gas sensing properties of undoped tin oxide sensors. In: APPLIED PHYSICS LETTERS, 104 (25).

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Official URL: http://dx.doi.org/10.1063/1.4885424


A correlation between gas sensing properties and defect induced Room Temperature Ferromagnetism (RTFM) is demonstrated in non-stoichiometric SnO2 prepared by solution combustion method. The presence of oxygen vacancies (V-O), confirmed by RTFM is identified as the primary factor for enhanced gas sensing effect. The as-prepared SnO2 shows high saturation magnetization of similar to 0.018 emu/g as compared to similar to 0.002 and similar to 0.0005 emu/g in annealed samples and SnO2 prepared by precipitation respectively. The SnO2 prepared by precipitation which is an equilibrium method of synthesis shows lesser defects compared to the combustion product and hence exhibits lesser sensitivity in spite of smaller crystallite size. The study utilizes RTFM as a potential tool to characterize metal oxide gas sensors and recognizes the significance of oxygen vacancies in sensing mechanism over the microstructure. (C) 2014 AIP Publishing LLC.

Item Type: Journal Article
Additional Information: copy right for this article belongs to the AMER INST PHYSICS New Yark
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 20 Aug 2014 09:28
Last Modified: 23 Oct 2018 14:47
URI: http://eprints.iisc.ac.in/id/eprint/49638

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