균일 침전법을 이용한 SnO2 나노분말의 H2 감지 특성
H2 gas sensing characteristics of SnO2 nano-powders prepared by homogeneous precipitation method
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초록
Nanosized SnO2 particles were synthesized by homogeneous precipitation method using tin chloride (SnCl4 • 5H2O) and urea (CO(NH2)2). The powders were heated at 500 oC and 600 oC for 2 h. The crystal structure, microstructure, thermal behavior, specific surface area were analyzed using XRD, FE-SEM, TGA and BET, respectively. The initial resistance and the H2 sensing properties were measured as a function of Sb2O3 and Pd doping concentrations. The resistance was decreased with the addition of Sb2O3 and the sensitivity for H2 gas was increased with the addition of Pd. Thus, the optimum H2 gas sensing property was obtained in the 0.25 mol% Sb2O3 and 1 w% added SnO2 powders.
Abstract
Nanosized SnO2 particles were synthesized by homogeneous precipitation method using tin chloride (SnCl4 • 5H2O) and urea (CO(NH2)2). The powders were heated at 500 oC and 600 oC for 2 h. The crystal structure, microstructure, thermal behavior, specific surface area were analyzed using XRD, FE-SEM, TGA and BET, respectively. The initial resistance and the H2 sensing properties were measured as a function of Sb2O3 and Pd doping concentrations. The resistance was decreased with the addition of Sb2O3 and the sensitivity for H2 gas was increased with the addition of Pd. Thus, the optimum H2 gas sensing property was obtained in the 0.25 mol% Sb2O3 and 1 w% added SnO2 powders.
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