Au@ZnO core–shell structure for gaseous formaldehyde sensing at room temperature

In this study, Au@ZnO core–shell structure was fabricated using the sol gel method to manufacture the sensing materials. The properties of the sensing material were analyzed with UV–vis spectra, X-ray diffraction spectra, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. Th...

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Bibliographic Details
Published inSensors and actuators. B, Chemical Vol. 199; pp. 314 - 319
Main Authors Chung, Feng-Chao, Zhu, Zhen, Luo, Peng-Yi, Wu, Ren-Jang, Li, Wei
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2014
Subjects
Au@ZnO
Core–shell
Gas sensor
Gaseous formaldehyde
Core–shell
Gaseous formaldehyde
Gas sensor
Au@ZnO
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Summary:In this study, Au@ZnO core–shell structure was fabricated using the sol gel method to manufacture the sensing materials. The properties of the sensing material were analyzed with UV–vis spectra, X-ray diffraction spectra, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The ZnO material showed a 1.91 sensor response, whereas 1wt% Au/ZnO exhibited a 5.58 sensor response. The response and recovery times of the 1wt% Au/ZnO material measured 262s and 134s, respectively. Au@ZnO further enhanced the sensor response to 10.57 while reducing the response and recovery times to 138s and 104s, respectively. This study also demonstrates a formaldehyde gas-sensing mechanism involving HCHO adsorption, surface reaction and product desorption. Therefore, the favorable gas-sensing characteristics of the Au@ZnO core–shell structure make it a promising material for practical sensors.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2014.04.004