title: A Ni-Doped Carbon Nanotube Sensor for Detecting Oil-Dissolved Gases in Transformers.
abstract: C2H2, C2H4, and C2H6 are important oil-dissolved gases in power transformers. Detection of the composition and content of oil-dissolved gases in transformers is very significant in the diagnosis and assessment of the state of transformer operations. The commonly used oil-gas analysis methods have many disadvantages, so this paper proposes a Ni-doped carbon nanotube (Ni-CNT) gas sensor to effectively detect oil-dissolved gases in a transformer. The gas-sensing properties of the sensor to C2H2, C2H4, and C2H6 were studied using the test device. Based on the density functional theory (DFT) the adsorption behaviors of the three gases on intrinsic carbon nanotubes (CNTs) and Ni-CNTs were calculated. The adsorption energy, charge transfer, and molecular frontier orbital of the adsorption system were also analyzed. Results showed that the sensitivity of the CNT sensor to the three kinds of gases was in the following order: C2H2 > C2H4 > C2H6. Moreover, the doped Ni improved the sensor response, and the sensor response and gas concentration have a good linear relationship.
authors.affiliation: State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shapingba District, Chongqing 400044, China. jia-lun@163.com.
authors.forename: Jia
authors.initials: J
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shapingba District, Chongqing 400044, China. xiaoxing.zhang@outlook.com.
authors.forename: Xiaoxing
authors.initials: X
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shapingba District, Chongqing 400044, China. xiaoqingwu@cqu.edu.cn.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Wu
authors.affiliation: State Grid Guizhou Liupanshui Power Supply Company, Liupanshui 553000, China. daizq382812@163.com.
authors.forename: Ziqiang
authors.initials: Z
authors.lastname: Dai
authors.affiliation: Chongqing Power Company, Beibei 400700, China. wufeng.200809@163.com.
authors.forename: Jinbin
authors.initials: J
authors.lastname: Zhang
keywords: carbon nanotubes; linear relationship; nickel-doped; oil-dissolved gas; sensor response