氧化锌气体传感器的制备及甲烷检测特性研究

甲烷(CH4)是电力变压器油纸绝缘中溶解的主要故障特征气体,能有效反映运行变压器油纸绝缘故障.气体传感检测是油中气体在线监测、分析的关键.基于水热法,制备了氧化锌(ZnO)纳米片和纳米球气敏材料及传感元件,基于实验室搭建的微量气体检测平台测试了其对CH4的检测特性.研究表明:基于ZnO纳米片制作的气体传感器比纳米球传感器对CH4表现出更好的气敏性能,对50μL/L CH4的最佳工作温度降低了约60℃,同时对低浓度(1μL/L～20μL/L)CH4表现出较高的线性度和长期稳定性.本研究对研制高性能的ZnO基CH4气体传感器奠定了基础.

Fabrication and Sensing Properties of ZnO based Gas Sensors to Methane

Methane( CH4 ) ,a typical fault characteristic gas dissolved in transformer oil,can effectively indicate power transformer electric faults. Gas sensing technology is the key of on-line monitoring and analysis of trace gases dissolved in transformer oil. Low-dimensional ZnO nanosheets and ZnO nanospheres were synthesized with the hydro-thermal method,and gas sensors were fabricated with the synthesized samples. The detection characteristics of the sensor to the CH4 gas sensing were investigated based on the laboratory trace gas platform. Compared with the ZnO nanospheres based sensor, the ZnO nanosheets gas sensor exhibits enhanced sensing properties, including higher sensing response,lower operating temperature,high linearity in low concentration range from 1 to 20 and long-term stability. In addition,the best working temperature of the 50 μL/L CH4 was reduced by 60 ℃. All results provide a feasible way to develop high performance CH4 gas sensors based on ZnO nanosheets for practical application.