Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 57, Pages 13176-13183Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201902483
Keywords
adsorption; gas sensing; metal-organic frameworks; surface chemistry; XPS
Categories
Funding
- National Science Foundation [1903188]
- Bakar Fellows Program
- Office of Science, Office of Basic Energy Sciences, of the US Department of Energy [DE-AC02-05CH11231]
- Directorate For Engineering [1903188] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys [1903188] Funding Source: National Science Foundation
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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 approximate to 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.
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