钯掺杂氮化镓纳米管对变压器油中乙烯气体的吸附特性  

Adsorption Properties of Pd Doped GaNNTs Nanotubes to Transformer Oil Dissolved C2H4 Gas

作　　者：桂银刚 陈盈 张晓星 陈文龙 陈显平[3] GUI Yingang;CHEN Ying;ZHANG Xiaoxing;CHEN Wenlong;CHEN Xianping(College of Engineering and Technology,Southwest University,Chongqing 400715,China;College of Electrical and Electronic Engineering,Hubei University of Technology,Wuhan 430068,China;College of Optoelectronic Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]西南大学工程技术学院,重庆400715 [2]湖北工业大学电气与电子工程学院,武汉430068 [3]重庆大学光电工程学院,重庆400044

出　　处：《高电压技术》2022年第4期1462-1470,共9页High Voltage Engineering

基　　金：国家自然科学基金(51907165);中央高校基本科研业务费专项资金(XDJK2020B024)。

摘　　要：为了在线监测油浸式电力变压器的运行状态,基于密度泛函理论(DFT)的第一性原理,研究了一种可用于检测变压器油中溶解气体之一——乙烯(C_(2)H_(4))的掺杂改性氮化镓纳米管(GaNNTs)气敏材料。分别将1~4个Pd原子形成的团簇掺杂于GaNNTs表面上,分析了掺杂改性后的体系对C_(2)H_(4)气体的气敏响应特性,发现Pd原子掺杂在纳米管表面作为吸附活性位点,有效提高了GaNNTs对C_(2)H_(4)气体的吸附性能。基于吸附体系的吸附结构、电荷转移、态密度、能带结构和分子轨道计算,深入分析了掺杂改性GaNNTs对C_(2)H_(4)气体的气敏响应机理,结合脱吸附,对比发现Pd-Ga NNTs对C_(2)H_(4)具有最佳的气敏响应性能。该研究为实验开发用于在线监测C_(2)H_(4)等变压器油中溶解气体的高性能气敏传感器提供理论基础。In order to monitor the operation state of oil-immersed power transformer on-line,a surficially modified gas-sensing material,which can be adopted for ethylene detection,one of the decomposed gases in transformer oil,was focused on based on the density functional theory(DFT)of first-principles calculation.Moreover,the gas-sensitive response characteristics of Ga NNTs to C_(2)H_(4)gas were studied after the clusters formed by doping 1~4 Pd atoms,respectively.It is found that the Pd atoms doping on the surface of nanotubes,acting as adsorption active sites,can effectively improve the adsorption performance of Ga NNTs for C_(2)H_(4) gas.Based on the calculations of adsorption structure,charge transfer,density of states,energy band structure,and molecular orbital,the gas sensing response mechanism of doped GaNNTs to C_(2)H_(4) gas was analyzed in detail.Combined with desorption,it is found that Pd4-Ga NNTs show the best gas sensing response performance to C_(2)H_(4).This study provides a theoretical basis for the experimental development of high-performance gas sensors for on-line monitoring of dissolved gases in transformer oil,such as C_(2)H_(4).

关 键 词：油浸式变压器 绝缘故障 乙烯 Pd -GaNNTs DFT 

分 类 号：TM41[电气工程—电器]