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

详细信息    查看全文

• 作者：Qiang GengAuthor Vitae ; Xiahui LinAuthor Vitae ; Ruiru SiAuthor Vitae ; Xun ChenAuthor Vitae ; Wenxin Dai ; ^{daiwenxin@fzu.edu.cn}Author Vitae ; Xianzhi FuAuthor Vitae ; Xuxu Wang ; ^{xwang@fzu.edu.cn}Author Vitae
• 关键词：TiO2 ; Sensor ; Ethylene response ; Photocatalytic oxidation ; Electron transfer
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2012
• 出版时间：November, 2012
• 年：2012
• 卷：174
• 期：Complete
• 页码：449-457
• 全文大小：1736 K

文摘

The anatase and rutile TiO₂ film sensors were prepared by drop-coating method with calcination at 450 and 600 ¡ãC, 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.