用于SO_2气体检测的4A型分子筛掺杂碳纳米管气敏传感器研制  

Sensitive Characteristics Analysis on 4A Molecular Sieve Doped Carbon Nanotube Sensor for Detecting SO_2

作　　者：张晓星[1] 罗晨晨[1] 唐炬[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《高电压技术》2015年第1期146-151,共6页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724506);国家自然科学基金资助(51277188);中央高校基本科研业务费专项资金(0213005202042)~~

摘　　要：SO2作为SF6气体在局部放电作用下的重要特征分解组分,其体积分数大小和变化规律可用于判断SF6绝缘设备内局部放电的严重程度。为提高碳纳米管传感器对SO2气体的检测灵敏度,实现对SO2气体的快速实时检测,提出了一种分子筛掺杂碳纳米管制备气敏传感器的方法,研究了不同掺杂比例的传感器对体积分数为10-4的SO2气体的气敏响应特性,并对反应机理进行了初步探讨。结果表明:与本征碳纳米管相比,4A分子筛掺杂制备出的碳纳米管气敏传感器对SO2的灵敏度有了显著提高,电阻变化率从0.96%最大提高至33.7%,并且传感器具有良好的重复性和稳定性,多次重复试验表明传感器电阻变化率保持稳定。研究结果为最终实现SF6气体绝缘设备中SO2气体的在线监测奠定了试验基础。SO2 is an important characteristic component of SF6 decomposition under partial discharge （PD）, so its content and varying pattern are adopted to evaluate PDs in SF6 gas insulated equipment. To improve intrinsic carbon nanotubes gas sensors, which have poor sensitivity to SO2, we proposed a kind of gas sensor made of sieve-doped carbon nanotubes. We experimentally investigated the sensitivity of this 4A molecular sieve-doped carbon nanotube gas sensor to SO2 in volume fraction of 10-4, as well as the connection between the doped ratio and the gas sensitivity. We also analyzed the response mechanism of the gas sensor preliminarily. The results show that, compared with intrinsic carbon nanotubes gas sensor, the gas sensor featuring sieve-doped carbon nanotube is significantly improved in sensitivity to SO2, its resistance change rate of SO2 increases to 33.7% from 0.96%. The proposed kind of sensor is also excellent in repeatability and stability： the resistance change rate is stable in multiple repeating tests. The results are the solid experimental basis for further realizing monitoring SO2 in SF6 gas insulated equipment online.

关 键 词：SO2 SF6局部放电 碳纳米管 分子筛 气敏传感器 气敏响应 

分 类 号：TM595[电气工程—电器] TP212[自动化与计算机技术—检测技术与自动化装置]