Investigation of Gas-Sensing Property of Acid-Deposited Polyaniline Thin-Film Sensors for Detecting H2S and SO2

Sensors

Xiaoxing Zhang¹  Hao Cui¹  Dachang Chen²  Xiaoqing Wu³  Xingchen Dong³ 

[1] System Security and New Technology, Chongqing University, Chongqing 400044, China;Fuyang Power Supply Company, State Grid Anhui Electric Power Company, Fuyang 236000, China;;State Key Laboratory of Power Transmission Equipment &

关键词: gas-insulated switchgear;    partial discharge;    polyaniline;    acid deposition;    gas-sensing property;   

DOI  :  10.3390/s16111889

来源: DOAJ

【 摘 要 】

Latent insulation defects introduced in manufacturing process of gas-insulated switchgears can lead to partial discharge during long-time operation, even to insulation fault if partial discharge develops further. Monitoring of decomposed components of SF6, insulating medium of gas-insulated switchgear, is a feasible method of early-warning to avoid the occurrence of sudden fault. Polyaniline thin-film with protonic acid deposited possesses wide application prospects in the gas-sensing field. Polyaniline thin-film sensors with only sulfosalicylic acid deposited and with both hydrochloric acid and sulfosalicylic acid deposited were prepared by chemical oxidative polymerization method. Gas-sensing experiment was carried out to test properties of new sensors when exposed to H2S and SO2, two decomposed products of SF6 under discharge. The gas-sensing properties of these two sensors were compared with that of a hydrochloric acid deposited sensor. Results show that the hydrochloric acid and sulfosalicylic acid deposited polyaniline thin-film sensor shows the most outstanding sensitivity and selectivity to H2S and SO2 when concentration of gases range from 10 to 100 μL/L, with sensitivity changing linearly with concentration of gases. The sensor also possesses excellent long-time and thermal stability. This research lays the foundation for preparing practical gas-sensing devices to detect H2S and SO2 in gas-insulated switchgears at room temperature.

【 授权许可】

Unknown