摘要
对采用水热合成技术所形成的纳米 (Sn,Sb)O_(2-x)晶粒结构、厚膜材料的气敏特性及其机理进行了研究 ,并采用 XRD、 TEM手段对纳米尺度的（ Sn、 Sb)O_(2-x)晶粒的结构与表面效应及晶粒形态进行了表征 .结果表明，当掺杂 Sb5＋的浓度（摩尔分数 xSb5＋ )为（ 2.9～ 5.8)× 10－ 6时，（ Sn、 Sb)O_(2-x)纳米晶粒表面的电子缺陷浓度增大，增强了对气体的吸附能力，从而提高了对可燃性气体的灵敏度 .同时可使晶粒保持短柱状的形态特征，对其灵敏度有一定的控制作用 .
The influence of Sb5+ ions on SnO2-x crystallinity and gas-sensing properties of the sensors based on the SnO2-x. powders prepared by hydrothemal synthesis technique was investigated by XRD and TEM. The results show that the doping of Sb5+ ions in the ranges of (2.9 similar to5.8 x 10(-6)) makes the grains of the SnO2-x, a short column in shape and plays an important role in decreasing the resistance values in air ( R,,) for the sensor and controlling the sensitivity to CH4, CO, C2H5OH and H-2. Finally, the surface electronic defect effect and the size effect of SnO2-x, crystallite in nanometer level were discussed to understand the gas sensing mechanism of sensors based on the (Sn, Sb)O2-x nanostructure thick film materials.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2001年第9期832-835,共4页
Acta Physico-Chimica Sinica
基金
陕西省科学技术发展计划资助项目(编号98K-10G)
