The effect of porosity on the CO sensing properties of TiO2 xerogel thin films

被引：16

作者：

Lee, Jin-Seok ^{[1
]}

Ha, Tae-Jung ^{[1
]}

Hong, Min-Hee ^{[1
]}

Park, Hyung-Ho ^{[1
]}

机构：

[1] Yonsei Univ, Dept Mat Sci & Engn, Seoul 120749, South Korea

来源：

THIN SOLID FILMS | 2013年 / 529卷

基金：

新加坡国家研究基金会;

关键词：

TiO2 xerogel film; CO gas sensor; Solvothermal drying; Sensitivity; Response time; Recovery time; GAS SENSOR; DEPOSITION; TITANIUM; AEROGELS; POWDERS; SURFACE;

D O I：

10.1016/j.tsf.2012.10.072

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

TiO2 gas sensing materials based on nanostructured xerogel were produced by a solvothermal drying process. The CO sensing ability of the anatase form of TiO2 was evaluated at a temperature of 350 degrees C. TiO2 xerogel thin films with high surface areas and different porosities were annealed at 450 degrees C under vacuum. The crystallite sizes and ceramic microstructures of the powders were analyzed by scanning electron microscopy, and the crystal structures of the powder were obtained from X-ray diffraction patterns. Fourier transform infrared spectroscopy was used to investigate the chemical bonding of the TiO2 xerogel films. Structural and morphological studies were carried out in order to investigate their influences on the sensing properties of the TiO2 xerogel thin films. The sensing behavior of anatase TiO2 toward CO in an oxidizing environment was studied in order to understand the basis for CO sensing. The CO sensing properties of TiO2 xerogel thin films varied depending on their porosity, i.e., specific surface area. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：98 / 102

页数：5

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