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J. Korean Ceram. Soc. > Volume 40(5); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(5): 441.
doi: https://doi.org/10.4191/kcers.2003.40.5.441
ZnO 산화물의 열적 전기적 특성
박보석, 홍광준, 신동찬, 이우선, 김호기1, 박진성
조선대학교 신소재공학과
1한국과학기술원 재료공학과
Thermal and Electrical Properties of ZnO Oxides
Fine powders of ZnO were synthesized by the sol-gel method. The shape of gel powders with calcination temperatures changed into the sheet structure, the needle shape, and the spherical grain. The growth rate of grain size was slow to 700$^{circ}C$ but high above 700$^{circ}C$. The bigger the grain size is, the higher the degree of crystallization is. The organic element in gel powders evaporated below 300$^{circ}C$. Temperature dependence of conductances showed the sigmoidal shape, but the temperature range of the constant conductances narrowed with the decrement of the calcination temperature of gel powders. The optimum sensing property for CO gas were observed with the specimen calcined at 500$^{circ}C$ and degraded with the increment of calcination temperature.
Key words: ZnO oxides, Sensing, Grain size, Sigmoidal shape
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