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He+ LEIS analysis combined with pulsed jet technique of ethanol sensing by a ZnO surface
Applied Surface Science ( IF 6.7 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.apsusc.2020.148102
T.T. Suzuki , Y. Adachi , T. Ohgaki , I. Sakaguchi

Abstract Low-energy He+ ion scattering spectroscopy (He+ LEIS) was combined with the pulsed jet technique to analyze the outermost surface of a Zn-ZnO (0001) substrate that is sensing trace ethanol (EtOH, 50 ppmv) contained in the air. The gas sensing response to EtOH by ZnO under static atmospheric pressure was successfully simulated by the periodically pulsed gas jet irradiation onto the surface while keeping the background pressure low enough to operate He+ LEIS. It was found that the gas sensing response to EtOH is due to the surface compositional change analyzed by He+ LEIS. Thus, the gas sensing response to EtOH is caused by adsorption of EtOH-related molecules on the surface, which governs the oxygen ionosorption. It was demonstrated that the combination of He+ LEIS and the pulsed jet technique is a useful approach to analyze the outermost surface of a gas sensor in the realistic working condition.

中文翻译:

He+ LEIS 分析结合 ZnO 表面乙醇传感脉冲喷射技术

摘要 低能 He+ 离子散射光谱 (He+ LEIS) 与脉冲喷射技术相结合,分析了 Zn-ZnO (0001) 基材的最外表面,该基材可检测空气中含有的痕量乙醇 (EtOH, 50 ppmv)。ZnO 在静态大气压下对 EtOH 的气敏响应通过周期性脉冲气体射流照射到表面上成功模拟,同时保持足够低的背景压力以操作 He+ LEIS。发现对 EtOH 的气敏响应是由于 He+ LEIS 分析的表面成分变化。因此,对 EtOH 的气敏响应是由 EtOH 相关分子在表面上的吸附引起的,它控制着氧离子吸附。
更新日期:2021-02-01
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