Berkeley Sensor & Actuator Center, University of California, Berkeley, 403 Cory Hall, Berkeley, CA, 94720, USA.
Department of Chemical and Biomolecular Engineering, University of California, Berkeley, 201 Gilman Hall, Berkeley, CA, 94720, USA.
Chemistry. 2019 Oct 11;25(57):13176-13183. doi: 10.1002/chem.201902483. Epub 2019 Sep 13.
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 NO -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.
化学传感中的一个经典挑战是选择性。金属-有机骨架（MOFs）是一类令人兴奋的材料，因为它们可以针对选择性化学吸附进行调整。吸附事件会引发功函数的变化，这可以通过化学敏感场效应晶体管（功率≈微瓦）进行检测。在这项工作中，进行了几个案例研究，以推广传感机制，最终朝着我们的金属中心假说发展。HKUST-1 被用作湿度传感器的原理验证。响应与厚度无关，这意味着响应是表面局域的。ZIF-8 被证明是一种 NO 感应材料，响应主要由金属位点的吸附主导。最后，MFM-300(In) 展示了如何使用标准的软硬酸碱理论定性预测传感器响应。本文为使用金属-有机骨架的可调谐性进行分布式、可扩展的化学传感奠定了基础。
