Research on a Fast-Response Thermal Conductivity Sensor Based on Carbon Nanotube Modification.
Research on a Fast-Response Thermal Conductivity Sensor Based on Carbon Nanotube Modification.
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基于碳纳米管修饰的快速响应热导率传感器研究
DOI：
10.3390/s18072191
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发表时间：
2018-07-07
期刊：
影响因子：
--
通讯作者：
Liu X
中科院分区：
文献类型：
--
作者：
Zhang H;Shen B;Hu W;Liu X
针对传统珠式热导气体传感器响应慢的问题，利用多壁碳纳米管（MWNTs）结合载体修饰技术，对传感器载体进行性能修饰，可制成快速响应的热导气体传感器。采用化学沉淀法制备了颗粒状纳米γ-Al 2 O3/ZrO 2载体材料，SEM分析表明其粒径为50-70 nm。将载体材料湿法掺入碳纳米管中，得到复合载体γ-Al 2 O3/ZrO 2/MWNTs。结果表明，所设计的热导传感器对甲烷气体具有快速响应，90%响应时间为7 s，恢复时间为16 s。传感器输出与CH 4气体浓度之间具有良好的线性关系，平均灵敏度为1.15 mV/1%CH4。因此，在γ-Al 2 O3/ZrO 2中掺杂碳纳米管可以提高热导传感器的响应速度。
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.
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