Next Article in Journal
Investigation of A Slow-Light Enhanced Near-Infrared Absorption Spectroscopic Gas Sensor, Based on Hollow-Core Photonic Band-Gap Fiber
Next Article in Special Issue
Characteristics and Temperature Compensation of Non-Dispersive Infrared (NDIR) Alcohol Gas Sensors According to Incident Light Intensity
Previous Article in Journal
A Dynamic Estimation of Service Level Based on Fuzzy Logic for Robustness in the Internet of Things
Previous Article in Special Issue
High-Performance Limiting Current Oxygen Sensor Comprised of Highly Active La0.75Sr0.25Cr0.5Mn0.5O3 Electrode
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Sensors 2018, 18(7), 2191; https://doi.org/10.3390/s18072191

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

1
School of Automation, Harbin Engineering University, Harbin 150001, China
2
School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
3
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)
Full-Text   |   PDF [4135 KB, uploaded 7 July 2018]   |  

Abstract

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
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top