A Ni-Doped Carbon Nanotube Sensor for Detecting Oil-Dissolved Gases in Transformers

Sensors

Jia Lu³  Xiaoxing Zhang³  Xiaoqing Wu³  Ziqiang Dai²  Jinbin Zhang¹ 

[1] Chongqing Power Company, Beibei 400700, China; E-Mail:;State Grid Guizhou Liupanshui Power Supply Company, Liupanshui 553000, China; E-Mail:;State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shapingba District, Chongqing 400044, China; E-Mails:

关键词: oil-dissolved gas;    carbon nanotubes;    nickel-doped;    sensor response;    linear relationship;   

DOI  :  10.3390/s150613522

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.