WANG Cheng-yang, LI Yu-ling, DING Wen-bo, et al. Research and fabrication of NO2 gas sensor based on MEMS technology[J]. 2018, (7): 81-83. DOI: 10.13873/j.1000-9787(2018)07-0081-03.
基于MEMS工艺的NO2气体传感器研制
摘要
设计了一种基于微机电系统(MEMS)工艺的以氧化钨(WO3)为敏感材料的微结构气体传感器
并从半导体理论解释了WO3对二氧化氮(NO
2
)的敏感机理。气体传感器芯片尺寸为1.3 mm×1.3 mm
微热板的有效面积为0.4 mm×0.4 mm。实验结果表明:设计的气体传感器对NO
2
气体表现出良好的响应
在最佳工作温度下(140℃)功耗为23 m W
最低检测限达50×10-9
响应时间为60 s
恢复时间为180 s。
Abstract
A gas sensor based on micro-electro-mechanical system( MEMS) technology using WO
3
as sensitive material is designed and fabricated. The sensitive mechanism is explained from the semiconductor theory. The effective area with dimensions of 0. 4 mm × 0. 4 mm is located at the center of a sensor( 1. 3 mm × 1. 3 mm). The experimental results show that the gas sensor exhibits good response to NO
2
power consumption is about 23 m W at the optimal working temperature of 140 ℃
the lowest detection limit is about 50 × 10-9
the response and recovery time is only 60 s and 180 s