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 Yoto Card - Storytime multiwalled carbon nanotubes (MWNTs), combined with the technology of copyright modification, to modify the performance of the sensor copyright.The copyright 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 copyright material was wet-incorporated into carbon nanotubes, the composite copyright 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 PASSIONFLOWER 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.