Study on Preparation and Gas Sensitivity of (Sn1-x,Co2x)O2 Nano-particles
Using analytically pure SnCl4·5H2O (AP) and NH3·H2O (AP) as main raw materials, (Sn1-x,Co2x)O2 nano-particles were prepared by homogenous co-precipitation method with different molar rates of Co2+/Sn4+. The gas sensors were made by thick film technique with pure or doped SnO2 layers on mica-substrates. Through analyzing the structure, crystalline property and activity of Co2xSn1-xO2, Sn4+ in the crystal lattice of SnO2 is partly replaced by Co2+, which results in change of the M-O bond lengths, lattice parameters and asymmetry of electrovalent balance of M-O octahedrons. It improves the activity and n-type semiconductor property of SnO2. The sensitivities of the sensors in H2 atmosphere with different concentrations at 75±℃ were tested and analyzed. As a result, doping Co2+ improves the sensitivity, the relation of sensitivities and concentrations of H2 is linear and the best doping ratio of preparing (Sn1-x,Co2x)O2 gas-sensing material are obtained.
SnO2 gas-sensing doping homogenous co-precipitation method
彭同江 孙红娟 刘海峰 樊亮
西南科技大学矿物材料与应用研究所彭同江,四川绵阳 621010
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）