碳纤维温度传感器的感温机理及其应用研究

Temperature Sensing Mechanism and Application of Carbon Fiber Temperature Sensor

碳基材料的温度传感机理研究报道中很少讨论碳材料的固有杂质对温度响应的影响,因此选择了杂质和缺陷较多的碳纤维丝束作为研究对象,研究杂质散射机理与其温度响应的关系。基于杂质散射机理和碳纤维的几何特点,分析了碳纤维的感温机理,并提出了相应的温度标定公式,即碳纤维在123.15 K至423.15 K的宽温度范围内,电导G对温度T^(3/2)具有良好的线性响应。两者的变化量可定义为碳纤维丝束温度传感器的灵敏度,此温度传感器的灵敏度可以通过灵活调控碳纤维的几何结构和化学掺杂来改变,这进一步验证了碳纤维的电荷传输行为在123 K~423 K的温度范围都符合杂质散射。此外,结合温度标定公式和无线蓝牙电路,设计出一种响应时间快达0.6 s的便携式柔性温度传感器,可快速、实时地监测人体和环境温度。

In research reports on the temperature sensing mechanism of carbon-based materials,the influence of the inherent impurity on the feature of temperature response of the materials is rarely discussed.The carbon fiber beam with impurities and defects is used to study the relationship between the impurity scattering mechanism and the temperature response effect.According to the impurity scattering mechanism,the temperature sensing mechanism model and temperature calibration formula is proposed,i.e.,the conductance(G)of carbon fibre is linearly related to the square root of the cube of the temperature value(T^(3/2))in the temperature range of 123.15 K to 423.15 K.In the meantime,the sensitivities of carbon fiber temperature sensors can be tuned by chemical doping and beam geometry,further verifying that the charge transport behavior of the carbon fiber is in accordance with the impurity scattering mechanism in the aferementioned temperature range.Additionally,based on a the temperature calibration formula,a portable carbon fiber beam temperature measurement device is fabricated using bluetooth circuit.The response time of this device is only 0.6 s,and this device can be used to monitor the temperature of human body and environment fast and in real time.