408 (15 pp.)
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 Publication Citation
Amoah, P. K., Hassan, Z. M., Franklin, R. R., Baumgart, H., Redel, E., & Obeng, Y. S. (2022). Broadband dielectric spectroscopic detection of aliphatic alcohol vapors with surface-mounted HKUST-1 MOFs as sensing media. Chemosensors, 10(10), 1-15, Article 408. https://doi.org/10.3390/chemosensors10100408
Amoah, Papa K.; Hassan, Zeinab Mohammed; Franklin, Rhonda R.; Baumgart, Helmut; Redel, Engelbert; and Obeng, Yaw S., "Broadband Dielectric Spectroscopic Detection of Aliphatic Alcohol Vapors With Surface-Mounted HKUST-1 MOFs as Sensing Media" (2022). Electrical & Computer Engineering Faculty Publications. 336.
0000-0003-3328-2692 (Amoah), 0000-0001-8272-2151 (Baumgart)