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IEEE Sens J

Title:		Multi-Frequency Measurement of Volatile Organic Compounds With a Radio-Frequency Interferometer
Author(s):		Li H; Chen Z; Borodinov N; Shao Y; Luzinov I; Yu G; Wang P;
Address:		"College of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 61000, China (holly@uestc.edu.cn). Department of Electrical and Computer Engineering, Clemson University, Clemson, SC 29634 USA. Department of Materials Science and Engineering, Clemson University, Clemson, SC 29634 USA. Department of Physics, University of Findlay, Findlay, OH 45840 USA"
Journal Title:		IEEE Sens J
Year:		2017
Volume:		20170407
Issue:		11
Page Number:		3323 - 3331
DOI:		10.1109/JSEN.2017.2692521
ISSN/ISBN:		1530-437X (Print) 1530-437X (Linking)
Abstract:		"We present a radio-frequency (RF) sensor and its measurement results of three volatile organic compounds (VOCs) at multiple frequency points from approximately 2 to approximately 11 GHz, which is a convenient range in our examination. The sensor is based on a simple RF interferometer and uses two coplanar waveguides (CPWs), A and B of 5 and 25 mm length, respectively, as VOC sensing electrodes. Approximately 70-nm-thick poly copolymer films are coated on CPW surfaces for VOC adsorption and concentration. It is shown that ethanol, acetone, and isopropyl (IPA) induce frequency-dependent RF responses, which are also VOC-dependent. Thus, the frequency-dependent properties provide a possible new approach for better VOC sensing selectivity. With CPW A, the limit-of-detections (LODs) are approximately 600 ppm for ethanol, approximately 270 ppm for acetone, and approximately 330 ppm for IPA at 9.29 GHz. With CPW B, the LODs are roughly four times better. These LODs are also better than most of other RF VOC sensor results. In the future work, it is promising to further improve RF sensitivity and selectivity significantly"
Keywords:		RF interferometer Voc broadband dispersion;
Notes:		"PubMed-not-MEDLINELi, Hao Chen, Zhe Borodinov, Nikolay Shao, Yongzhi Luzinov, Igor Yu, Guofen Wang, Pingshan eng K25 GM100480/GM/NIGMS NIH HHS/ 2017/06/01 IEEE Sens J. 2017 Jun; 17(11):3323-3331. doi: 10.1109/JSEN.2017.2692521. Epub 2017 Apr 7"