Abstract
The practical production of gas sensor devices poses a significant challenge in terms of designing electronic devices that possess the advantages of a simplistic structure and can be easily and conveniently manufactured through batch processing. Hence, a simple architecture is important in creating new type of gas sensor that could realize experimental purposes in real-life situations. Porous zinc oxide hollow microspheres (ZnO HMS) sensing materials were successfully synthesized via hydrothermal process. The detection of ultra-low gas concentrations, such as 100 ppb ethanol, was achieved using a novel ZnO HMS modified with Au. The ethanol sensing perform of the 1.0 wt%Au-ZnO is 7.7 times and 1.7 times higher than that of the ZnO HMS and 0.5 wt%Au-ZnO. Furthermore, even at a low concentration of 100 ppb, a good sensing response of 1.476 is acquired. Also, we found the low theoretical detection limitation of the 1.0 wt%Au-ZnO was 25.1 ppb.
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