Abstract
We leveraged chemical-induced changes to microwave signal propagation characteristics (i.e., S-parameters) to characterize the detection of aliphatic alcohol (methanol, ethanol, and 2-propanol) vapors using TCNQ-doped HKUST-1 metal-organic-framework films as the sensing material, at temperatures under 100 °C. We show that the sensitivity of aliphatic alcohol detection depends on the oxidation potential of the analyte, and the impedance of the detection setup depends on the analyte-loading of the sensing medium. The microwaves-based detection technique can also afford new mechanistic insights into VOC detection, with surface-anchored metal-organic frameworks (SURMOFs), which is inaccessible with the traditional coulometric (i.e., resistance-based) measurements.
Original language | English (US) |
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Article number | 408 |
Journal | Chemosensors |
Volume | 10 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2022 |
Bibliographical note
Funding Information:E.R. acknowledges financial support by the Deutsche Forschungsgemeinschaft (DFG) within the Priority Program COORNET (Grant No. SPP 1928). P.K.A. and H.B. acknowledge financial help from Old Dominion University.
Publisher Copyright:
© 2022 by the authors.
Keywords
- aliphatic alcohol vapor detection
- broadband dielectric microwave spectroscopy
- HKUST-1 metal–organic framework (MOF) sensing material
- TCNQ-HKUST-1 SURMOF, thin film sensing material
- VOC detection