Research On Resistance Temperature Sensor Based On Three Dimensional Grapheme Network

Temperature monitoring plays an extremely important role in various fields and has become a part of people's daily life.Traditional temperature sensors,such as platinum resistance temperature sensors and other sensors using metal or metal oxide as sensing materials,show the characteristics of unstable sensing performance and low sensitivity.The development of today's society puts forward higher requirements for the sensing performance of temperature sensors.In recent years,graphene,graphene derivatives and graphene-based nanocomposites have been widely used in the field of temperature sensing due to their excellent electrical and thermal conductivity.In view of this,graphene oxide and graphene material with three-dimensional network structure are respectively used as sensing materials in this paper,which are self-assembled to the surface of PI(Polyimide)flexible interdigital electrode by gravity deposition to form a conductive loop,and a resistive temperature sensor is prepared,which realizes temperature sensing measurement and is committed to exploring an equivalent with high sensitivity and good sensing performance to replace the traditional temperature sensor.In this paper,the temperature sensing mechanism of graphene-based materials is theoretically analyzed.In the experiment,graphene-based resistive temperature sensor was prepared,and the temperature characteristics of the prepared sensor were tested.The temperature coefficient of resistance(TCR)and sensitivity of the sensor were analyzed.The experimental results show that the initial resistance of the sensor covered with graphene oxide material is large,in the order of M?.And that thickness of the cover material affects the sensing characteristics of the sensor.The thicker the covering material is,the more obvious its temperature hysteresis is,and the worse its stability and recovery are.When the deposition amount of GO material is 25?L,the sensor shows better temperature sensing characteristics.The TCR of the sensor can reach-1.50%/K,and the sensitivity is 1.470 M?/K.For the resistive temperature sensor covered with three-dimensional network graphene,experimental data show that the thickness of the covering material affects the sensing characteristics of the sensor.When the deposition amount of the three-dimensional network graphene solvent is 50-75?L,the sensors show good temperature sensing characteristics.In the process of temperature rise and fall,it shows excellent follow-up and good recovery.In the temperature range of 303-338 K,the relative resistance change rate of the sensor is relatively high,reaching more than 50%.At the same time,the sensor shows good negative temperature characteristics,TCR can reach-1.50%/K,and sensitivity can reach 1.494 K?/K.