Shinkai Takeshi, Masumoto Keigo, Iwai Masaru, Inomata Yusuke, Kida Tetsuya
Department of Material Science and Applied Chemistry, Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan.
Division of Materials Science, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan.
Sensors (Basel). 2022 Aug 20;22(16):6277. doi: 10.3390/s22166277.
Understanding the surface chemistry of target gases on sensing materials is essential for designing high-performance gas sensors. Here, we report the effect of Pt-loading on the sensing of volatile organic compounds (VOCs) with ZnO gas sensors, demonstrated by diffuse reflection infrared Fourier transform (DRIFT) spectroscopy. Pt-loaded ZnO nanocrystals (NCs) of 13~22 nm are synthesized using the hot soap method. The synthesized powder is deposited on an alumina substrate by screen-printing to form a particulate gas sensing film. The 0.1 wt% Pt-loaded ZnO NC sensor shows the highest sensor response to acetone and ethanol at 350 °C, while the responses to CO and H are small and exhibit good selectivity to VOCs. The gas sensing mechanism of ethanol with Pt-ZnO NCs was studied by in situ DRIFT spectroscopy combined with online FT-IR gas analysis. The results show that ethanol reacts with small Pt-loaded ZnO to produce intermediate species such as acetaldehyde, acetate, and carbonate, which generates a high sensor response to ethanol in air.
了解传感材料上目标气体的表面化学对于设计高性能气体传感器至关重要。在此，我们报道了铂负载对ZnO气体传感器检测挥发性有机化合物（VOCs）的影响，这通过漫反射红外傅里叶变换（DRIFT）光谱得以证明。采用热皂法合成了13~22nm的铂负载ZnO纳米晶体（NCs）。通过丝网印刷将合成的粉末沉积在氧化铝基板上，以形成颗粒状气体传感膜。0.1wt%铂负载的ZnO NC传感器在350°C时对丙酮和乙醇表现出最高的传感器响应，而对CO和H的响应较小，并且对VOCs具有良好的选择性。通过原位DRIFT光谱结合在线傅里叶变换红外气体分析研究了乙醇与铂 - ZnO NCs的气敏机理。结果表明，乙醇与少量铂负载的ZnO反应生成乙醛、乙酸盐和碳酸盐等中间物种，这在空气中对乙醇产生了高传感器响应。
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