{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,1,6]],"date-time":"2025-01-06T05:09:01Z","timestamp":1736140141066,"version":"3.32.0"},"reference-count":28,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2018,3,6]],"date-time":"2018-03-06T00:00:00Z","timestamp":1520294400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"the National Key R&D Program of China","award":["2016YFC0207100"]},{"DOI":"10.13039\/501100001809","name":"the National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["51272253"],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100012541","name":"Guangdong Innovative and Entrepreneurial Research Team Program","doi-asserted-by":"publisher","award":["No. 2014ZT05C146"],"id":[{"id":"10.13039\/100012541","id-type":"DOI","asserted-by":"publisher"}]},{"name":"the State Key Laboratory of Multiphase Complex Systems","award":["MPCS-2014-C-01"]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"Nowadays, the detection of low concentration combustible methane gas has attracted great concern. In this paper, a coupling p+n field effect transistor (FET) amplification circuit is designed to detect methane gas. By optimizing the load resistance (RL), the response to methane of the commercial MP-4 sensor can be magnified ~15 times using this coupling circuit. At the same time, it decreases the limit of detection (LOD) from several hundred ppm to ~10 ppm methane, with the apparent response of 7.0 \u00b1 0.2 and voltage signal of 1.1 \u00b1 0.1 V. This is promising for the detection of trace concentrations of methane gas to avoid an accidental explosion because its lower explosion limit (LEL) is ~5%. The mechanism of this coupling circuit is that the n-type FET firstly generates an output voltage (VOUT) amplification process caused by the gate voltage-induced resistance change of the FET. Then, the p-type FET continues to amplify the signal based on the previous VOUT amplification process.<\/jats:p>","DOI":"10.3390\/s18030787","type":"journal-article","created":{"date-parts":[[2018,3,6]],"date-time":"2018-03-06T17:16:27Z","timestamp":1520356587000},"page":"787","source":"Crossref","is-referenced-by-count":11,"title":["Coupling p+n Field-Effect Transistor Circuits for Low Concentration Methane Gas Detection"],"prefix":"10.3390","volume":"18","author":[{"given":"Xinyuan","family":"Zhou","sequence":"first","affiliation":[{"name":"State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China"},{"name":"University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China"}]},{"given":"Liping","family":"Yang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China"}]},{"given":"Yuzhi","family":"Bian","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China"},{"name":"University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China"}]},{"given":"Xiang","family":"Ma","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China"},{"name":"University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9177-6792","authenticated-orcid":false,"given":"Ning","family":"Han","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China"},{"name":"Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China"}]},{"given":"Yunfa","family":"Chen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China"},{"name":"Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China"}]}],"member":"1968","published-online":{"date-parts":[[2018,3,6]]},"reference":[{"key":"ref_1","first-page":"105","article-title":"Comparison of two standard test methods for determining explosion limits of gases at atmospheric conditions","volume":"A70","author":"Notele","year":"1999","journal-title":"J. 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