传感技术学报2017，Vol.30Issue(9)：1305-1309,5.DOI:10.3969/j.issn.1004-1699.2017.09.001
钴掺杂二氧化锡基氢气传感器气敏特性研究
Research on Hydrogen Sensing Properties of Cobalt Doped SnO2 Based Chemical Gas Sensor
摘要
Abstract
Hydrogen( H2 ) is one of the most important fault gases dissolved in power transformer oil,and on-line mo-nitoring the concentration of H2 in oil could reflect the operational state of transformer timely and effectively. Con-sidering the limitations of higher operating temperature and lower gas response,the paper proposed a cobalt-doped nano-SnO2 based gas sensor to detect fault gas H2 dissolved in transformer oil. The gas sensor was prepared with the side heated preparation process and H2 sensing properties were measured. Furthermore,based on the first principles calculations,an atomic level understanding of adsorption process and the sensing mechanism were investigated. Re-sults indicate that the optimum working temperature of SnO2 based gas sensor decreases and its sensing response in-creases obviously after Co dopant. New doping levels and surface states appear near the Fermi level of SnO2 crystal, which could promote the electrical conductivity and the charge transfer between H2 and SnO2 in gas sensing process.关键词
气体传感器/二氧化锡/氢气/气敏特性/第一性原理Key words
gas sensor/tin oxide/hydrogen/gas sensing performances/the first principle分类
信息技术与安全科学引用本文复制引用
张清妍,周渠,彭姝迪,吴高林,洪长翔,徐苓娜,唐超,谭为民..钴掺杂二氧化锡基氢气传感器气敏特性研究[J].传感技术学报,2017,30(9):1305-1309,5.基金项目
国家自然科学基金项目( 51507144) （ 51507144）
重庆市自然科学基金项目( cstc2016jcyjA0400) （ cstc2016jcyjA0400）
