Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media
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 propagatio...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-06-01
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| Series: | Chemosensors |
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| Online Access: | https://www.mdpi.com/2227-9040/10/7/241 |
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| author | Papa K. Amoah Zeinab Mohammed Hassan Pengtao Lin Engelbert Redel Helmut Baumgart Yaw S. Obeng |
| author_facet | Papa K. Amoah Zeinab Mohammed Hassan Pengtao Lin Engelbert Redel Helmut Baumgart Yaw S. Obeng |
| author_sort | Papa K. Amoah |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-09T10:21:09Z |
| format | Article |
| id | doaj.art-4fc1f109f6f449ecbf65f7d6a5ebc474 |
| institution | Directory Open Access Journal |
| issn | 2227-9040 |
| language | English |
| last_indexed | 2024-03-09T10:21:09Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Chemosensors |
| spelling | doaj.art-4fc1f109f6f449ecbf65f7d6a5ebc4742023-12-01T22:01:05ZengMDPI AGChemosensors2227-90402022-06-0110724110.3390/chemosensors10070241Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing MediaPapa K. Amoah0Zeinab Mohammed Hassan1Pengtao Lin2Engelbert Redel3Helmut Baumgart4Yaw S. Obeng5Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, VA 23529, USAKarlsruhe Institute of Technology, Institute of Functional Interfaces (IFG), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, GermanyDepartment of Electrical and Computer Engineering, Old Dominion University, Norfolk, VA 23529, USAApplied Research Center at Thomas Jefferson National Accelerator Laboratories, 12050 Jefferson Avenue, Suite 721, Newport News, VA 23606, USADepartment of Electrical and Computer Engineering, Old Dominion University, Norfolk, VA 23529, USAPhysical Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USAThe 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.https://www.mdpi.com/2227-9040/10/7/241broadband dielectric microwave spectroscopysolid-state ZnO-sensing materialHKUST-1 metal–organic framework (MOF) sensing materialethanol detection |
| spellingShingle | Papa K. Amoah Zeinab Mohammed Hassan Pengtao Lin Engelbert Redel Helmut Baumgart Yaw S. Obeng Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media Chemosensors broadband dielectric microwave spectroscopy solid-state ZnO-sensing material HKUST-1 metal–organic framework (MOF) sensing material ethanol detection |
| title | Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media |
| title_full | Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media |
| title_fullStr | Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media |
| title_full_unstemmed | Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media |
| title_short | Broadband Dielectric Spectroscopic Detection of Ethanol: A Side-by-Side Comparison of ZnO and HKUST-1 MOFs as Sensing Media |
| title_sort | broadband dielectric spectroscopic detection of ethanol a side by side comparison of zno and hkust 1 mofs as sensing media |
| topic | broadband dielectric microwave spectroscopy solid-state ZnO-sensing material HKUST-1 metal–organic framework (MOF) sensing material ethanol detection |
| url | https://www.mdpi.com/2227-9040/10/7/241 |
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