Novel Pt/TiO2-WO3 materials irradiated by visible light used in a photoreductive ozone sensor

被引：13
作者：
Chen, Ming-Hung [1 ]
Lu, Chung-Shin [2 ]
Wu, Ren-Jang [1 ]
机构：
[1] Providence Univ, Dept Appl Chem, Shalu, Taiwan
[2] Natl Taichung Univ Sci & Technol, Dept Gen Educ, Taichung, Taiwan
来源：
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS | 2014年 / 45卷 / 03期
关键词：
Composite; Chemical synthesis; Photoreduction; Resistance; SENSING PROPERTIES; THIN-FILMS; PHOTOCATALYTIC ACTIVITY; WO3; DEGRADATION; TIO2; SNO2; NANOCOMPOSITES; SENSITIVITY; O-3;
D O I：
10.1016/j.jtice.2013.08.020
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Novel sensors based on Pt/TiO2-WO3 metal-oxide semiconductors are a promising inexpensive alternative for commercial ozone monitoring. Pt-doping promotes TiO2-WO3 composite material to respond to ozone, and the doped films presented a high sensor response. The sensing materials were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Xray diffraction (XRD), and ultraviolet-visible (UV-vis) spectroscopy. When irradiated using a 460-nm light source, the sensor response of Pt/TiO2-WO3 (1:4) was 2712, and the recovery time was 85 s. Pt was doped with TiO2-WO3 to enhance the electron-hole separation, and the sensor response increased. In addition, the recovery time decreased considerably. This study presents a discussion of the slowing of the electron and hole recombination on the surface of the sensing material caused by the charge transfer of the mixing band. Pt/Ti02-W03 is a high-response photocatalyst when irradiated by visible light in 2.5 ppm of ozone at room temperature. (C) 2013 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：1043 / 1048
页数：6
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