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Sensors 2018, 18(3), 787; https://doi.org/10.3390/s18030787

Coupling p+n Field-Effect Transistor Circuits for Low Concentration Methane Gas Detection

1,2
,
1
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1,2
,
1,2
,
1,3,* and 1,3,*
1
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
2
University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China
3
Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
*
Authors to whom correspondence should be addressed.
Received: 22 January 2018 / Revised: 9 February 2018 / Accepted: 19 February 2018 / Published: 6 March 2018
(This article belongs to the Section Chemical Sensors)
Full-Text   |   PDF [3034 KB, uploaded 6 March 2018]   |  

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 ± 0.2 and voltage signal of 1.1 ± 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. View Full-Text
Keywords: low concentration methane gas; metal oxide gas sensors; field effect transistors; amplification effect low concentration methane gas; metal oxide gas sensors; field effect transistors; amplification effect
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Zhou, X.; Yang, L.; Bian, Y.; Ma, X.; Han, N.; Chen, Y. Coupling p+n Field-Effect Transistor Circuits for Low Concentration Methane Gas Detection. Sensors 2018, 18, 787.

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