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Amorphous Carbon-Loaded WO3 Nanosheet Arrays for ppb-Level NO2 Sensing with Improved Anti-Humidity Property
Yichao Wang1, Xi Li1, Chuanxin Ge1
1School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China.
Abstract:
Metal-oxide-based gas sensors have attracted considerable interest due to their low cost, high sensitivity, quick response, and ease of miniaturization and integration. Unfortunately, metal oxides are susceptible to the interference of moisture, which brings about hydroxyl poisoning of the sensing layer and decrement in baseline resistance and sensor performance. In this study, WO3 films were modified with a porous amorphous carbon layer. The as-loaded amorphous carbon layer improves simultaneously the adsorption capacity of WO3 and hydrophobicity of the surface, which endows the composite films with not only surpassing NO2 sensitivity at the parts per billion level but also enhanced immunity to humidity. The incorporation of amorphous carbon with metal oxides is expected to be a general route for the fabrication of high performance, antihumidity gas sensors.
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