Zn端接的ZnO（0001）块状单晶基质对乙醇气体的传感。,ACS Omega

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Zn端接的ZnO（0001）块状单晶基质对乙醇气体的传感。
ACS Omega ( IF 3.7 ) Pub Date : 2020-08-11 , DOI: 10.1021/acsomega.0c02750
Taku T Suzuki ₁ , Takeshi Ohgaki ₁ , Yutaka Adachi ₁ , Isao Sakaguchi ₁ , Minoru Nakamura ₂ , Hideyuki Ohashi ₂ , Akihisa Aimi ₂ , Kenjiro Fujimoto ₂

Affiliation

金属氧化物半导体气体传感器已被广泛研究用于选择性检测痕量浓度的各种气体。确定控制气体传感响应的反应方案对于进一步开发至关重要。然而，尽管是最深入研究的目标气体和传感材料组合之一，但ZnO传感乙醇（EtOH）气体的机理仍存在争议。在这项工作中，首次使用具有明确化学计量和原子排列的块状单晶衬底作为传感材料，研究了用ZnO进行EtOH传感的详细机理。即使是毫米大小的厚度，在ZnO衬底上的感应响应也很重要，并且随着衬底的电阻变大。大的感测响应是根据基板表面上的氧种类的吸附/解吸，即氧离子吸附来描述的。EtOH感应中涉及的离子吸附氧的价态被确定为O^{2 –}无论温度如何。感测响应随温度的增加归因于EtOH分子在表面上的氧化速率提高，这是通过脉冲喷射温度程序解吸质谱法分析得出的，该方法是新开发的，用于在模拟工作条件下分析表面反应。

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Ethanol Gas Sensing by a Zn-Terminated ZnO(0001) Bulk Single-Crystalline Substrate.

Metal oxide semiconductor gas sensors have been widely studied for the selective detection of various gases with trace concentrations. The identification of the reaction scheme governing the gas sensing response is crucial for further development; however, the mechanism of ethanol (EtOH) gas sensing by ZnO is still controversial despite being one of the most intensively studied target gas and sensing material combinations. In this work, for the first time, the detailed mechanism of EtOH sensing by ZnO is studied by using a bulk single-crystalline substrate, which has a well-defined stoichiometry and atomic arrangement, as the sensing material. The sensing response is substantial on the ZnO substrate even with a millimeter-size thickness, and it becomes larger with resistance of the substrate. The large sensing response is described in terms of the adsorption/desorption of the oxygen species on the substrate surface, namely, oxygen ionosorption. The valence state of the ionosorbed oxygen involved in EtOH sensing is identified to be O^2– regardless of the temperature. The increase in the sensing response with the temperature is attributed to the enhanced oxidation rate of the EtOH molecule on the surface as analyzed by pulsed-jet temperature-programmed desorption mass spectrometry, which has been newly developed for analyzing surface reactions in simulated working conditions.

更新日期：2020-08-25

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