物理化学学报 >> 2001, Vol. 17 >> Issue (09): 832-835.doi: 10.3866/PKU.WHXB20010915

研究简报 上一篇    下一篇

(Sn,Sb)O2-x基纳米结构厚膜材料气敏特性及机理

惠春;徐爱兰   

  1. 上海交通大学微纳米科学技术研究院,上海 200030
  • 收稿日期:2001-01-04 修回日期:2001-04-02 发布日期:2001-09-15
  • 通讯作者: 惠春 E-mail:chhui@xidian.edu.cn

Properties and Mechanism of Nanostructure Thick Film Materials Based on ( Sn,Sb )O2-x

Hui Chun;Xu Ai-Lan   

  1. Research Institute of Micro/Nanometer Science and Technology,Shanghai Jiaotong University,Shanghai 200030
  • Received:2001-01-04 Revised:2001-04-02 Published:2001-09-15
  • Contact: Hui Chun E-mail:chhui@xidian.edu.cn

摘要: 对采用水热合成技术所形成的纳米(Sn,Sb)O2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)O2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)O2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.

关键词: SnO2-x, 纳米结构, 气敏特性, 机理

Abstract: 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 (2.9~5.8×10-6) makes the grains of the SnO2x a short column in shape and plays an important role in decreasing the resistance values in air (Ra) for the sensor and controlling the sensitivity to CH4,CO,C2H5OH and H2.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.

Key words: SnO2-x, Nanostructure, Gas sensing material, Mechanism