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Vol. 78, Issue 4, April 2007, pp. 1134-1142




Some Spinel Oxide Compounds as Reducing Gas Sensors


Nicolae Rezlescu, Elena Rezlescu, Florin Tudorache, Paul Dorin Popa

Institute of Technical Physics, D. Mangeron 47, 700050 Iasi, Romania

Tel.: 40-232-430680, fax: 40-232-231132, E-mail: reznic@phys-iasi.ro



Received:  16 February 2007   /Accepted: 20 April 2007   /Published: 23 April 2007


Abstract: Four spinel ferrites, MFe2O4 (M = Cu, Cd, Zn and Ni), having various grain sizes (100 700 nm) were prepared by sol-gel-selfcombustion 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


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