The correlation between the ethylene response and its oxidation over TiO2 under UV irradiation

被引：34
作者：
Geng, Qiang [1 ]
Lin, Xiahui [1 ]
Si, Ruiru [1 ]
Chen, Xun [1 ]
Dai, Wenxin [1 ]
Fu, Xianzhi [1 ]
Wang, Xuxu [1 ]
机构：
[1] Fuzhou Univ, State Key Lab Breeding Base, Fujian Prov Key Lab Photocatalysis, Res Inst Photocatalysis, Fuzhou 350002, Peoples R China
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2012年 / 174卷
基金：
中国国家自然科学基金;
关键词：
TiO2; Sensor; Ethylene response; Photocatalytic oxidation; Electron transfer; GAS-SENSING PROPERTIES; PHOTOCATALYTIC OXIDATION; HUMIDITY; LIGHT; PROPERTY; NANOTUBE; SENSOR; FILMS; OXIDE;
D O I：
10.1016/j.snb.2012.08.062
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The anatase and rutile TiO2 film sensors were prepared by drop-coating method with calcination at 450 and 600 degrees C, respectively. After tested the ethylene sensing property over the as-prepared TiO2 sensors under UV irradiation, it was found that the anatase TiO2 as well as the rutile sensor exhibited a response to ethylene in the dry nitrogen atmosphere, but with anatase showing a much lower response to ethylene (almost no response) than rutile in the dry air atmosphere (containing oxygen). Moreover, this difference to the ethylene response between the anatase TiO2 sensor and the rutile one was also observed in a wet air atmosphere under UV irradiation. Based on the results of photocatalytically oxidizing ethylene over anatase and rutile TiO2, it is proposed that the weak gas response to ethylene over the anatase TiO2 under UV irradiation can be attributed to the oxidation of ethylene itself. This also suggests that a good photo-assisted semi-conductor sensor should have a strong photoresponse property but a weak photocatalytic performance for the sensed gas. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：449 / 457
页数：9
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