Oxygen sensing performance of Nb-doped TiO2 thin film with porous structure

被引：26
作者：
Gan, Linhui [1 ]
Wu, Congcong [1 ]
Tan, Yuan [1 ]
Chi, Bo [1 ]
Pu, Jian [1 ]
Jian, Li [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Ctr Fuel Cell Innovat, Wuhan 430074, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 585卷
基金：
中国国家自然科学基金;
关键词：
Titania; Nb-doping; Oxygen sensing; Sol-gel method; GAS SENSOR; MECHANISM; TEMPERATURE; NANOWIRES; COATINGS; ANATASE;
D O I：
10.1016/j.jallcom.2013.09.161
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this paper, Nb-doped titanium dioxide (TiO2) porous thin films in application of oxygen sensors were studied. A facile sol-gel method was used to prepare the undoped and Nb-doped TiO2 thin films. The microstructure and oxygen-sensing behavior were investigated. The results indicate that Nb-doping can retard the phase transition from anatase to rutile and reduce the grain size. The oxygen responses of the thin film can be greatly improved by Nb-doping, which are 73.2 and 78.7 for sample with 6% Nb-doping measured at 700 degrees C in the atmosphere with 2% and 20.9% oxygen, while those for undoped TiO2 are only 6.5 and 6.6 in the same condition. The 6% Nb-doped TiO2 thin film also shows the fastest response time of only 1.1 s at 700 degrees C, which is only less than 1/10 of those for the undoped TiO2 thin film. (C) 2013 Elsevier B. V. All rights reserved.
引用
收藏
页码：729 / 733
页数：5
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