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Open AccessArticle

A Room-Temperature CNT/Fe3O4 Based Passive Wireless Gas Sensor

by Tao Guo 1,†, Tianhao Zhou 1,2,†, Qiulin Tan 1,2,*, Qianqian Guo 1,2, Fengxiang Lu 1,2 and Jijun Xiong 1,2
1
Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Tai Yuan 030051, China
2
Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China
*
Author to whom correspondence should be addressed.
Tao Guo and Tianhao Zhou contributed equally to this work.
Sensors 2018, 18(10), 3542; https://doi.org/10.3390/s18103542
Received: 28 August 2018 / Revised: 27 September 2018 / Accepted: 10 October 2018 / Published: 19 October 2018
(This article belongs to the Special Issue Advanced Nanomaterials based Gas Sensors)
A carbon nanotube/Fe3O4 thin film-based wireless passive gas sensor with better performance is proposed. The sensitive test mechanism of LC (Inductance and capacitance resonant) wireless sensors is analyzed and the reason for choosing Fe3O4 as a gas sensing material is explained. The design and fabrication process of the sensor and the testing method are introduced. Experimental results reveal that the proposed carbon nanotube (CNT)/Fe3O4 based sensor performs well on sensing ammonia (NH3) at room temperature. The sensor exhibits not only an excellent response, good selectivity, and fast response and recovery times at room temperature, but is also characterized by good repeatability and low cost. The results for the wireless gas sensor’s performance for different NH3 gas concentrations are presented. The developed device is promising for the establishment of wireless gas sensors in harsh environments. View Full-Text
Keywords: wireless passive; carbon nanotube/Fe3O4 thin film; gas sensor; NH3 wireless passive; carbon nanotube/Fe3O4 thin film; gas sensor; NH3
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MDPI and ACS Style

Guo, T.; Zhou, T.; Tan, Q.; Guo, Q.; Lu, F.; Xiong, J. A Room-Temperature CNT/Fe3O4 Based Passive Wireless Gas Sensor. Sensors 2018, 18, 3542.

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