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. 2019 Oct 11;25(57):13176-13183.
doi: 10.1002/chem.201902483. Epub 2019 Sep 13.

Transistor-Based Work-Function Measurement of Metal-Organic Frameworks for Ultra-Low-Power, Rationally Designed Chemical Sensors

David W Gardner  1   2 , Xiang Gao  1   3 , Hossain M Fahad  1   4 , An-Ting Yang  1   2 , Sam He  3 , Ali Javey  1   4 , Carlo Carraro  1   2 , Roya Maboudian  1   2
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Free article

Transistor-Based Work-Function Measurement of Metal-Organic Frameworks for Ultra-Low-Power, Rationally Designed Chemical Sensors

David W Gardner et al. Chemistry. .
Free article

Abstract

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.

Keywords: XPS; adsorption; gas sensing; metal-organic frameworks; surface chemistry.

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