Heterostructure Fe2O3–In2O3 Nanoparticles as Hydrogen Gas Sensor

Chethana, DM and Thanuja, TC and Mahesh, HM and Kiruba, MS and Barshilia, HC and Yallappa, S and Manjanna, J (2021) Heterostructure Fe2O3–In2O3 Nanoparticles as Hydrogen Gas Sensor. Journal of Electronic Materials, 50 (8). pp. 4313-4323. ISSN 03615235

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Abstract

Fe2O3–In2O3 (9:1 mol.%) heterostructure nanoparticles were prepared by the thermal decomposition of stoichiometric amounts of Fe2C2O4 2H2O and In(OH)3 at 400°C for 20 h. The sample was characterized by x-ray difraction (XRD), Fouriertransform infrared spectrometry, thermogravimetry–diferential thermal analyzer, scanning electron microscopy/transmission electron microscopy, and a superconducting quantum interference device magnetometer. The XRD pattern could be indexed to both the rhombohedral α–Fe2O3 and cubic bixbyite In2O3 phases. This heterostructure system showed ferromagnetic properties (due to the presence of γ–Fe2O3 phase) from 5 to 300 K and a spin-glass-like behavior of magnetization versus temperature under zero-feld-cooled and feld-cooled conditions. H2 gas-sensing property was observed from 100 ppm to 2 ppm at 200 °C and 250 °C. Response and recovery times were about 275 s and 500 s, respectively, and the sensitivity varied from 2% to 21% as the H2 increased from 2 to 100 ppm. The Ra/Rg varied from 1 to 1.3 and the plot of Ra/Rg versus H2 could be fitted to the sigmoidal logistic function, y = A2 + (A1− A2) / (1 + (x/x0)p.

Item Type:	Article
Uncontrolled Keywords:	Heterostructure , Fe2O3-In2O3 nanoparticles, Characterization ,SQUID magnetometer, H2 gas sensor
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General) CHEMISTRY AND MATERIALS > Composite Materials CHEMISTRY AND MATERIALS > Metals and Metallic Materials
Depositing User:	Mrs. Usha Kumari
Date Deposited:	20 May 2022 11:11
Last Modified:	20 May 2022 11:11
URI:	http://nal-ir.nal.res.in/id/eprint/13566

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