Toluene and ethanol sensing performances of pristine and PdO-decorated flower-like ZnO structures

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• 作者：Zheng LouAuthor Vitae ; Jianan DengAuthor Vitae ; Lili WangAuthor Vitae ; Lijie Wang ; ^{wanglijie888@163.com}Author Vitae ; Teng FeiAuthor Vitae ; Tong Zhang ; ^{zhangtong@jlu.edu.cn}Author Vitae
• 关键词：ZnO ; Flower-like structures ; PdO-decorated ; Gas sensor
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：176
• 期：Complete
• 页码：323-329
• 全文大小：1233 K

文摘

The flower-like pristine (ZnO) and PdO-decorated ZnO (PdO-ZnO) materials with hierarchical structure were synthesized by a surfactant-free hydrothermal route and subsequent heat treatment. This method requires high concentrations of a zinc precursor (0.1 M) and introduction of an amount of PdO nanoparticles into the reaction system. The flower-like ZnO nanostructures comprises many aggregative rods with the diameter of about 200 nm. Having fabricated gas sensors based on the pristine and PdO-decorated flower-like ZnO, we find that the PdO-ZnO sensor exhibits a response of 100 ppm C₇H₈ and C₂H₅OH, which is about 4-5 times higher than that of pristine ZnO at the optimal operating temperature of 240 and 320 ¡ãC. The enhanced sensing performance demonstrates that the distinct increases in response are attributed to the sensitisation effect of PdO. The effects of PdO decorating on the sensing properties of flower-like ZnO structures have been investigated.