나노 세라믹 재료를 이용한 가연성 기체 센서에 관한 연구

Abstract

Nano sized SnO2 particles were synthesized by a homogeneous precipitation method using tin chloride(SnCl4·5H2O) and urea(CO(NH2)2). The powders were heated at temperature of 500oC and 600oC for 2 h. The structural properties were characterized by preforming X-ray Diffraction and scanning electron microscopy. In addition, thermal behavior was determined with Thermo Grametric Analysis, Finally, we employed Brunauer-Emmett-Teller technique to obtain specific surface area. The initial resistance and the H2 sensing properties were measured as a function of doping concentrations of Sb2O3 and Pd. The resistance was decreased with the amount of Sb2O3 while the sensitivity for H2 gas was increased with the amount of Pd. From these results, H2 gas sensing property was optimized at 0.25 mol% Sb2O3 and 1 wt% added SnO2 powders.