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Sensors 2018, 18(7), 2191;

Research on a Fast-Response Thermal Conductivity Sensor Based on Carbon Nanotube Modification

School of Automation, Harbin Engineering University, Harbin 150001, China
School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
School of Safety Engineering, Heilongjiang University of Science & Technology, Harbin 150022, China
Author to whom correspondence should be addressed.
Received: 17 April 2018 / Revised: 28 June 2018 / Accepted: 4 July 2018 / Published: 7 July 2018
(This article belongs to the Special Issue Functional Materials for the Applications of Advanced Gas Sensors)
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Aiming at solving the slow-response problem of traditional bead-type thermal conductivity gas sensors, a fast-response thermal conductivity gas sensor can be made by using multiwalled carbon nanotubes (MWNTs), combined with the technology of carrier modification, to modify the performance of the sensor carrier. The carrier material, granular nanoscale γ-Al2O3/ZrO2, was synthesized by chemical precipitation, and its particle size was found to be 50–70 nm through SEM. After the carrier material was wet-incorporated into carbon nanotubes, the composite carrier γ-Al2O3/ZrO2/MWNTs was obtained. The results show that the designed thermal conductivity sensor has a fast response to methane gas, with a 90% response time of 7 s and a recovery time of 16 s. There is a good linear relationship between the sensor output and CH4 gas concentration, with an average sensitivity of 1.15 mV/1% CH4. Thus, the response speed of a thermal conductivity sensor can be enhanced by doping carbon nanotubes into γ-Al2O3/ZrO2. View Full-Text
Keywords: Al2O3; carbon nanotubes; thermal conductivity; gas sensor Al2O3; carbon nanotubes; thermal conductivity; gas sensor

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Zhang, H.; Shen, B.; Hu, W.; Liu, X. Research on a Fast-Response Thermal Conductivity Sensor Based on Carbon Nanotube Modification. Sensors 2018, 18, 2191.

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