Document Type

Article

Publication Date

2022

DOI

10.3390/chemosensors10070241

Publication Title

Chemosensors

Volume

10

Issue

7

Pages

241 (1-15)

Abstract

The most common gas sensors are based on chemically induced changes in electrical resistivity and necessarily involve making imperfect electrical contacts to the sensing materials, which introduce errors into the measurements. We leverage thermal- and chemical-induced changes in microwave propagation characteristics (i.e., S-parameters) to compare ZnO and surface-anchored metal-organic-framework (HKUST-1 MOF) thin films as sensing materials for detecting ethanol vapor, a typical volatile organic compound (VOC), at low temperatures. We show that the microwave propagation technique can detect ethanol at relatively low temperatures (<100 >°C), and afford new mechanistic insights that are inaccessible with the traditional dc-resistance-based measurements. In addition, the metrological technique avoids the inimical measurand distortions due to parasitic electrical effects inherent in the conductometric volatile organic compound detection.

Comments

© 2022 by the authors.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 (CC BY 4.0) license.

Original Publication Citation

Amoah, P. K., Hassan, Z. M., Lin, P., Redel, E., Baumgart, H., & Obeng, Y. S. (2022). Broadband dielectric spectroscopic detection of ethanol: A side-by-side comparison of ZnO and HKUST-1 MOFs as sensing media. Chemosensors, 10(7), 1-15, Article 241. https://doi.org/10.3390/chemosensors10070241

ORCID

0000-0003-3328-2692 (Amoah), 0000-0002-1191-4532 (Lin)

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