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http://dx.doi.org/10.5369/JSST.2007.16.1.007

Catalytic combustion type hydrogen gas sensor using TiO2 and UV LED  

Hong, Dae-Ung (Department of Electrical and Electronic Engineering, Yonsei University)
Han, Chi-Hwan (Photo- & Electro-Materials Research Center, Korea Institute of Energy Research)
Han, Sang-Do (Photo- & Electro-Materials Research Center, Korea Institute of Energy Research)
Gwak, Ji-Hye (Photo- & Electro-Materials Research Center, Korea Institute of Energy Research)
Lee, Sang-Yeol (Department of Electrical and Electronic Engineering, Yonsei University)
Publication Information
Journal of Sensor Science and Technology / v.16, no.1, 2007 , pp. 7-10 More about this Journal
Abstract
A thick film catalytic gas sensors which can be operated at $142^{\circ}C$ 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 $TiO_{2}$ (5 wt%) and Pd/Pt (20 wt%) supported on $Al_{2}O_{3}$ powder and the reference material to compensate the heat capacity of it in a bridge circuit was an catalyst free $Al_{2}O_{3}$ 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 $TiO_{2}$ on the sensor sensitivity, response and recovery time has been investigated. The reduction of operating temperature from $192^{\circ}C$ to $142^{\circ}C$ 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 $TiO_{2}$ under UV radiation.
Keywords
$H_{2}$ gas sensor; catalytic sensor; UV radiation$TiO_{2}$ photo-catalyst;
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