Solid State Science and Technology, Vol. 12, No. 1 (2004) 213-218
ELECTRICAL AND HYDROGEN GAS SENSING PROPERTIES OF ZnO-CuO COMPOSITES
*Syahriyal, Ramli Omar, Ibrahim Abu Talib, Mohamad Deraman, Mohd Hafizudin Jumali, Elvaswer and Tulus Ikhsan Nasution
School of Applied Physics, Faculty of Science and Technology
Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor Darul Ehsan
Composites of xZnO:CuO with 1 ≤ x ≤ 3 composition ratio were fabricated in the form of pellets by sintering at 800oC. Their electrical conductivity and hydrogen gas sensitivity were examined between 100 and 500oC. Sample consisting of 1.5ZnO:CuO was found to have the highest sensitivity to both 5%H2 and 200 ppm H2. The sensitivity of the samples was found to decrease for the values of x greater than 2. The samples also shows higher sensitivity to 5%H2 than 200 ppm H2 above 250oC. The electrical conductivity of the composites varies with temperature and has a minimum values when the ZnO content is about 60-67 mole% for temperature above 350oC.
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