Ethanol and methanol sensing characteristics of Nb-doped TiO2 porous thin films

被引：24
作者：
Nechita, Violeta [1 ]
Schoonman, Joop [2 ]
Musat, Viorica [1 ]
机构：
[1] Dunarea de Jos Univ Galati, Ctr Nanostruct & Funct Mat, Galati 800008, Romania
[2] Delft Univ Technol, Dept Chem Engn Chem E, NL-2628 BL Delft, Netherlands
来源：
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 2012年 / 209卷 / 01期
关键词：
alcohol sensors; gas-sensing mechanism; Nb-TiO2 thin films; sol-gel; GAS; SOL; SENSITIVITY; PERFORMANCE; NIOBIUM;
D O I：
10.1002/pssa.201127057
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Undoped and Nb-doped TiO2 porous thin films have been obtained through a sol-gel method using analytical grades Ti((OC3H7)-C-i)(4) and Nb(OC2H5)(5) as precursors. The morphology, crystalline microstructure, and the sensing properties towards ethanol and methanol of the obtained thin films have been investigated. The effects of the dopant on the film morphology and on alcohol sensing properties are discussed. Both direct current (DC) and alternating current (AC) measurements were performed at different temperatures in methanol and ethanol ambients to better understand the mechanisms of the alcohol detection. In the presence of a small amount of Nb, the activation energy for electrical conduction decreased. Nb doping improves the selectivity for methanol in the temperature range of 300-400 degrees C. The Nyquist diagrams showed complex phenomena during alcohol detection. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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收藏
页码：153 / 159
页数：7
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