Improved Hydrogen Sensitivity and Selectivity in PdO with Metal-Organic Framework Membrane
Improved Hydrogen Sensitivity and Selectivity in PdO with Metal-Organic Framework Membrane
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DOI：
10.1149/1945-7111/abc0ac
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发表时间：
2020-10
影响因子：
3.9
通讯作者：
David W. Gardner;Yong Xia;H. Fahad;A. Javey;C. Carraro;R. Maboudian
中科院分区：
文献类型：
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作者：
David W. Gardner;Yong Xia;H. Fahad;A. Javey;C. Carraro;R. Maboudian
金属有机框架（mof）是一种高度可设计的多孔材料，作为化学传感器具有特殊的选择性。然而，它们并不总是适合与现有的传感平台结合，特别是依赖于传感材料的电子变化的传感模式（例如，工作功能响应或电导响应）。利用MOF的一种方法是将其作为多孔膜生长在传感层上，并使用MOF来影响传感层的电子结构。在本文中，一个概念验证的电子调制与MOFs演示。通过在纳米粒子上生长一层MOF“ZIF-8”，化学敏感场效应晶体管上的PdO纳米粒子感应层对还原性气体氢更敏感，而对氧化分子（如h2s和NO 2）更不敏感。x射线光电子能谱支持了这一机制，表明ZIF-8膜部分减少了PdO传感层。
Metal-organic frameworks (MOFs) are highly designable porous materials and are recognized for their exceptional selectivity as chemical sensors. However, they are not always suitable for incorporation with existing sensing platforms, especially sensing modes that rely on electronic changes in the sensing material (eg, work-function response or conductometric response). One way that MOFs can be utilized is by growing them as a porous membrane on a sensing layer and using the MOF to affect the electronic structure of the sensing layer. In this paper, a proof-of-concept for electronic modulation with MOFs is demonstrated. A PdO nanoparticle sensing layer on a chemical-sensitive field-effect-transistor is made more sensitive to a reducing gas, hydrogen, and less sensitive to oxidizng molecules, like H 2 S and NO 2, by growing a layer of the MOF" ZIF-8" over the nanoparticles. The proposed mechanism is supported by X-ray photoelectron spectroscopy showing that the ZIF-8 membrane partially reduces the PdO sensing layer.