贵金属掺杂二氧化锡基气敏传感器敏感机理及特性基础研究

项目名称： 贵金属掺杂二氧化锡基气敏传感器敏感机理及特性基础研究

项目编号： No.51277185

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 电工技术

项目作者： 陈伟根

作者单位： 重庆大学

项目金额： 88万元

中文摘要： 油中溶解气体在线监测已经成为实施电力变压器状态检修的关键技术之一，而传感器气体检测是在线监测技术的核心，直接影响系统的正确性、稳定性和使用寿命。SnO2基半导体气敏传感器对变压器油中溶解的H2，CO，CH4，C2H4，C2H2，C2H6，CO2七种主要故障特征气体均敏感，是目前最常用的气敏材料，但存在选择性差、灵敏度不高、易中毒、寿命短等缺点，严重制约了它的使用和发展。添加掺杂物是提高金属氧化物传感器气敏性能的主要方法。本课题从原子层面研究不同贵金属掺杂对SnO2气敏性能的影响，基于密度泛函理论结合第一性原理研究气敏反应过程中SnO2和吸附气体分子的微观原子和电子结构信息，建立掺杂薄膜表面分别与七种气体反应的气体吸附模型，通过试验与模拟计算建立贵金属掺杂SnO2基气体传感器的气敏反应模拟机制，研究新型SnO2基气体传感器及其气体检测特性,为高性能气敏传感器的研究开发提供新思路。

中文关键词： 气敏传感器；第一性原理；气敏机理；气敏特性；油中溶解气体

英文摘要： The on-line monitoring technique of gases dissolved in transformer oil is an important part in the condition maintenance of power transformers. The gas detection technology based on gas sensors is critical in the online monitoring technique, which directly influences the accuracy, stability and service life time of the online monitoring system. SnO2 base semiconductor gas sensors is sensitive to all the gases dissolved in transformer oil, i.e. H2、CO、CH4、C2H4、C2H2、C2H6、CO2 and so on. Therefore, it has been commonly used as the gas sensor materials.The application and development of gas sensor technique is seriously limited with its bad selectivity ,not high sensitivity, easy to poisoning and short life.Doping noble metal is the main method to improve the gas sensing property of semiconductor metal oxide gas sensor.This work is to investigate the noble metal how to influence the SnO2-based gas sensor gas-sensing properties from the atomic level.Based on density functional theory and the primary principle discuss the microscopic atomic and electronic structure information of SnO2 base semiconductor gas sensor and adsorpted gas molecules during the gas-sensing reaction.Establish gas adsorption model of the doped film surface with the gases dissolved in transformer oil respectively.Combing gas sensor characteristic t

英文关键词： Gas sensor；First principles；Gas sensing mechanism；Gas sensing properties；Dissolved Gases