Abstract
A thick film catalytic gas sensors which can be operated at <TEX>$142^{\circ}C$</TEX> in presence of ultra violet-light emitting diode has been developed to measure hydrogen concentration in 0-5 % range. The sensing material as a combustion catalyst consists of <TEX>$TiO_{2}$</TEX> (5 wt%) and Pd/Pt (20 wt%) supported on <TEX>$Al_{2}O_{3}$</TEX> powder and the reference material to compensate the heat capacity of it in a bridge circuit was an catalyst free <TEX>$Al_{2}O_{3}$</TEX> powder. Platinum heater and sensor materials were formed on the alumina plate by screen printing method and heat treatment. The effect of UV radiation in the presence of photo catalyst <TEX>$TiO_{2}$</TEX> on the sensor sensitivity, response and recovery time has been investigated. The reduction of operating temperature from <TEX>$192^{\circ}C$</TEX> to <TEX>$142^{\circ}C$</TEX> for hydrogen gas sensing property in presence of UV radiation is attributed to the hydroxy radical and superoxide which was formed at the surface of <TEX>$TiO_{2}$</TEX> under UV radiation.
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