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)|
|State||Published - Oct 2022|
Bibliographical noteFunding 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.
© 2022 by the authors.
- 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