期刊
SENSORS
卷 18, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/s18072191
关键词
Al2O3; carbon nanotubes; thermal conductivity; gas sensor
资金
- Natural Science Foundation of Heilongjiang province [ZD2015014]
- National Natural Science Foundation of China [61473095, 51504088]
- International Cooperation Project in Ministry of Science and Technology [2016YFE0110500]
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 gamma-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 gamma-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 gamma-Al2O3/ZrO2.
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