H2S sensing for breath analysis with Au functionalized ZnO nanowires
H2S sensing for breath analysis with Au functionalized ZnO nanowires
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DOI：
10.1088/1361-6528/abe004
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发表时间：
2021-01
期刊：
影响因子：
3.5
通讯作者：
Angelika Kaiser;Erick Torres Ceja;Yujia Liu;Florian Huber;R. Müller;U. Herr;K. Thonke
中科院分区：
文献类型：
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作者：
Angelika Kaiser;Erick Torres Ceja;Yujia Liu;Florian Huber;R. Müller;U. Herr;K. Thonke
这项工作提出了一种基于化学场效应晶体管 (ChemFET) 的 H2S 选择性电阻式气体传感器设计，该晶体管具有由数百条高温化学气相沉积 (CVD) 生长的氧化锌纳米线 (ZnO NW) 形成的开放栅极。系统分析了原始 ZnO 纳米线和表面功能化 ZnO 纳米线对 H2S 的传感能力。通过沉积不同厚度的催化剂层（1 至 10 nm）的不连续金（Au）纳米粒子薄膜来对 ZnO 纳米线进行功能化，并比较其气敏性能。所有实验均在室温下具有可调节气体混合物的温度稳定的小体积室中进行。这些结果使我们能够对信噪比、增强的响应以及由于金功能化而提高的检测限有充分的了解。理解和控制应用 Au 催化剂对 ZnO 纳米线的有益影响，可以检测室温下合成空气中低至 10 ppb 的极低 H2S 浓度，理论上估计为 500 ppt。
This work presents a H2S selective resistive gas sensor design based on a chemical field effect transistor (ChemFET) with open gate formed by hundreds of high temperature chemical vapour deposition (CVD) grown zinc oxide nanowires (ZnO NW). The sensing ability of pristine ZnO NWs and surface functionalized ZnO NWs for H2S is analysed systematically. ZnO NWs are functionalized by deposition of discontinuous gold (Au) nanoparticle films of different thicknesses of catalyst layer ranging from 1 to 10 nm and are compared in their gas sensing properties. All experiments were performed in a temperature stabilized small volume compartment with adjustable gas mixture at room temperature. The results allow for a well-founded understanding of signal-to-noise ratio, enhanced response, and improved limit of detection due to the Au functionalisation. Comprehension and controlled application of the beneficial effects of Au catalyst on ZnO NWs allow for the detection of very low H2S concentrations down to 10 ppb, and a theoretically estimated 500 ppt in synthetic air at room temperature.