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Abstract

SYNTHESIS AND CHARACTERIZATION OF PURE AND MODIFIED CR2O3 THICK FILMS AS A LPG SENSOR

D. N. Suryawanshi, I. G. Pathan, G. P. Borse, K. D. Ahirrao and L. A. Patil*

ABSTRACT

Thick films of pure chromium oxide (Cr2O3) were prepared by screenprinting
technique. Pure (Cr2O3) thick films were almost insensitive to
reducing gases. The surfaces of thick films of pure Cr2O3 were
modified by dipping them into 0.01 M aqueous solution of copper
chloride (CuCl3) for different intervals of time followed by firing at
5000C for 30 min. Firing results into the oxidation of CuCl3 additive
into CuO. The characterizations and the gas sensing properties of pure
and surface activated Cr2O3 thick films were investigated. The surface
activated Cr2O3 (60 min) thick films were observed to be sensitive to
1000 ppm of LPG at 3000C. The grains of CuO dispersed around the grains of Cr2O3 would
act as the barriers. Upon exposure of Liquefied Petroleum Gas (LPG), the barrier heights
would decrease greatly leading to drastic increase in conductance. The quick response and
fast recovery are the main features of this sensor. The effects of microstructure and additive
concentrations on the gas response, selectivity, response time and recovery time were studied
and discussed.

Keywords: CuO-activated Cr2O3, screen printing, thick film, LPG sensor, gas response.


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