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Study of some simple ferrites as reducing gas sensors

F. TUDORACHE1,* , E. REZLESCU1, P. D. POPA1, N. REZLESCU1

Affiliation

  1. National Institute of Research and Development for Technical Physics-IFT, No. 47, Blvd. D. Mangeron, 700050 Iasi, Romania

Abstract

Four spinel ferrites, MFe2O4 (M = Cu, Cd, Zn and Ni), having various grain sizes (100 – 700 nm) were prepared by sol-gelselfcombustion and their sensing properties to reducing gases were investigated. The gas sensing characteristics were obtained by measuring the sensitivity as a function of various controlling factors, like operating temperature, composition and concentration of the gas, and finally the response time. The sensitivity of four ferrites to reducing gases like acetone, ethanol and LPG was been compared. It was revealed that CuFe2O4 is the most sensitive to LPG and ZnFe2O4 can be used as a sensor to selectively detect ethanol vapors in air. The strong interaction between ethanol and porous ZnFe2O4 can explain the selective sensitivity to ethanol and negligible sensitivity to the other reducing gases..

Keywords

Gas sensor, Semiconducting materials, Structure characteristics, Sensitivity, Reducing gas.

Submitted at: April 1, 2008
Accepted at: July 1, 2008

Citation

F. TUDORACHE, E. REZLESCU, P. D. POPA, N. REZLESCU, Study of some simple ferrites as reducing gas sensors, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 7, pp. 1889-1893 (2008)