Transistor‐Based Work‐Function Measurement of Metal–Organic Frameworks for Ultra‐Low‐Power, Rationally Designed Chemical Sensors
Transistor‐Based Work‐Function Measurement of Metal–Organic Frameworks for Ultra‐Low‐Power, Rationally Designed Chemical Sensors
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基于晶体管的工作——金属功能测量——超低功耗、合理设计的化学传感器的有机框架
DOI：
10.1002/chem.201902483
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Maboudian, Roya
中科院分区：
文献类型：
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作者：
Gardner, David W.;Gao, Xiang;Fahad, Hossain M.;Yang, An‐Ting;He, Sam;Javey, Ali;Carraro, Carlo;Maboudian, Roya
化学传感中的一个经典挑战是选择性。金属有机框架（MOFs）是一类令人兴奋的材料，因为它们可以被调整为选择性化学吸附。吸附事件触发功函数偏移，这可以用化学敏感的场效应晶体管（功率为10微瓦）检测到。在这项工作中，使用了几个案例研究来概括传感机制，最终实现我们的金属中心假说。HKUST‐1被用作原理验证湿度传感器。响应是厚度无关的，意味着响应是表面局部化的。ZIF-8被证明是一种NO2-敏感材料，其响应主要是在金属位点上的吸附。最后，MFM-300（In）展示了标准软硬酸碱理论如何用于定性预测传感器响应。本文为利用金属有机框架的可调谐性与分布式，可扩展的设备进行化学传感奠定了基础。
A classic challenge in chemical sensing is selectivity. Metal–organic frameworks (MOFs) are an exciting class of materials because they can be tuned for selective chemical adsorption. Adsorption events trigger work‐function shifts, which can be detected with a chemical‐sensitive field‐effect transistor (power ≈microwatts). In this work, several case studies were used towards generalizing the sensing mechanism, ultimately towards our metal‐centric hypothesis. HKUST‐1 was used as a proof‐of‐principle humidity sensor. The response is thickness independent, meaning the response is surface localized. ZIF‐8 is demonstrated to be an NO2‐sensing material, and the response is dominated by adsorption at metal sites. Finally, MFM‐300(In) shows how standard hard–soft acid–base theory can be used to qualitatively predict sensor responses. This paper sets the groundwork for using the tunability of metal–organic frameworks for chemical sensing with distributed, scalable devices.