材料科学
热导率
石墨烯
碳纳米管
电导率
氢传感器
纳米技术
复合材料
碳纤维
电极
氢
导电体
光电子学
复合数
生物化学
物理化学
催化作用
有机化学
化学
钯
作者
Z. Zou,Hongquan Zhang,Yongyi Sun,Yanbin Gao,Ligang Dou
摘要
In order to overcome the many shortcomings of traditional hot-wire thermal conductivity sensor design, a new design method was proposed in which a graphene-composite carbon nanotube mixed carbon material was used as a thermal conductivity sensor carrier instead of nano-alumina particles. Taking advantage of the large specific surface area and high thermal conductivity of graphene, as well as the characteristics of a large number of gas transport channels modified by carbon nanotubes, a high-efficiency gas heat exchange medium is made. In order to improve the consistency of the product, electrochemical preparation of an aluminum oxide film material is used to make the chip substrate of the thermal conductivity sensor by MEMS process technology, and the heating sensitive electrode of the sensor is made by a thick film process. Experiments show that the sensor prepared by this method has high sensitivity and zero point stability and has greatly improved the detection accuracy and response time. The sensitivity of the sensor to hydrogen detection increases to 3.287 mV/1%H2, and the response time is shorter than 5.4 s. The research results have good application prospects.
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