Ni-CNT Chemical Sensor for SF6 Decomposition Components Detection: A Combined Experimental and Theoretical Study

被引：30

作者：

Gui, Yingang ^{[1
]}

Zhang, Xiaoxing ^{[3
]}

Lv, Peigeng ^{[2
]}

Wang, Shan ^{[2
]}

Tang, Chao ^{[1
]}

Zhou, Qu ^{[1
]}

机构：

[1] Southwest Univ, Coll Engn & Technol, Chongqing 400715, Peoples R China

[2] State Grid Chongqing Shiqu Power Supply Co, Chongqing 400015, Peoples R China

[3] Wuhan Univ, Sch Elect Engn, Wuhan 430072, Hubei, Peoples R China

来源：

SENSORS | 2018年 / 18卷 / 10期

关键词：

SF6 decomposition components; carbon nanotube sensor; Ni modification; adsorption; DFT calculations; CARBON NANOTUBE SENSORS; PARTIAL DISCHARGE; GAS SENSOR; PART; PRODUCTS;

D O I：

10.3390/s18103493

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

SF6 decomposition components detection is a key technology to evaluate and diagnose the insulation status of SF6-insulated equipment online, especially when insulation defects-induced discharge occurs in equipment. In order to detect the type and concentration of SF6 decomposition components, a Ni-modified carbon nanotube (Ni-CNT) gas sensor has been prepared to analyze its gas sensitivity and selectivity to SF6 decomposition components based on an experimental and density functional theory (DFT) theoretical study. Experimental results show that a Ni-CNT gas sensor presents an outstanding gas sensing property according to the significant change of conductivity during the gas molecule adsorption. The conductivity increases in the following order: H2S > SOF2 > SO2 > SO2F2. The limit of detection of the Ni-CNT gas sensor reaches 1 ppm. In addition, the excellent recovery property of the Ni-CNT gas sensor makes it easy to be widely used. A DFT theoretical study was applied to analyze the influence mechanism of Ni modification on SF6 decomposition components detection. In summary, the Ni-CNT gas sensor prepared in this study can be an effective way to evaluate and diagnose the insulation status of SF6-insulated equipment online.

引用

页数：11

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