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Sensors 2018, 18(9), 3022;

An LC Passive Wireless Gas Sensor Based on PANI/CNT Composite

2,3,* and 2,3
School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China
Key Laboratory of Instrumentation Science and Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China
Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Tai Yuan 030051, China
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Received: 7 June 2018 / Revised: 6 September 2018 / Accepted: 6 September 2018 / Published: 10 September 2018
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This paper proposes a wireless passive gas sensor based on the principle of LC mutual coupling. After the acidification of the carbon nanotube (CNT), the in-situ polymerization of the aminobenzene monomers was conducted on the surface of the acidified CNT to form a sensitive material composed of a polyaniline/carbon nanotube (PANI/CNT) composite. The Advanced Design System (ADS) software was used for simulating and analyzing the designed structure, which obtained the various parameters of the structure. A lead-free aluminum paste was printed on an alumina ceramic substrate via the screen printing technique to form an inductor coil, before the gas sensitive material was applied to prepare a wireless passive gas sensor, consisting of a single-turn inductor and interdigitated electrodes on the base structure. Finally, an experimental platform was built to test the performance of the sensor. The sensitivity of the gas sensor is about 0.04 MHz/ppm in an atmosphere with a NH3 concentration of 300 ppm. The sensor was shown to have good repeatability and high stability over a long time period. View Full-Text
Keywords: polyaniline; carbon nanotubes; wireless passive gas sensor; LC mutual coupling; gas sensitive materials; NH3 polyaniline; carbon nanotubes; wireless passive gas sensor; LC mutual coupling; gas sensitive materials; NH3

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Shen, S.; Fan, Z.; Deng, J.; Guo, X.; Zhang, L.; Liu, G.; Tan, Q.; Xiong, J. An LC Passive Wireless Gas Sensor Based on PANI/CNT Composite. Sensors 2018, 18, 3022.

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