Research On Wide Range Flexible Sensor Of Graphene Based On Lightscribe

Since the application of flexible electronic skin and flexible screens drives the development of flexible sensors,graphene is well suited for the preparation of flexible sensors due to its excellent electrical conductivity,mechanical properties and its ability to be transferred to a flexible substrate,and has been used in many applications.At present,the flexible sensor prepared by graphene can achieve high sensitivity under low pressure,and c an not meet the needs of practical applications.In this paper,patterned graphene is prepared by lightscribe reduction of graphene oxide,and the convex structure generated during the reduction process can affect the sensitivity and pressure range of the prepared sample.Firstly,the preparation and study of lightscribe graphene oxide were carried out,and the reduction of graphene oxide was carried out for different concentrations,and the number of reductions was 1~10 times.Then,the microstructure of the prepared sample was observed by optical microscope,and the line of the laser scribing was found to have directionality.The XPS characterization was performed on whether the sample had been reduced and the degree of reduction was performed.Finally,the electrical properties of the sample line were tested and SEM characterization is used to explain the electrical performance test results.According to the results of the electrical performance test,the direction in which the Ag tape is pasted during the subsequent pressure test is determined,and the resistance is hardly affected by the voltage,and the influence of the voltage on the result is excluded in the subsequent sensor pressure test.Before the pressure test,it is necessary to reduce the graphene oxide into a flexible pressure sensor,and then verify whether the sensor has a piezoresistive property,and then determine the pressure test of the reduced concentration graphene oxide sensor.The results obtained determine the choice of subsequent experimental concentrations,the pressure range is better,but the sensitivity is poor.Subsequent changes in the pattern to improve sensitivity,but the effect is not very good,followed by doping silver particles to improve sensitivity.In order to further increase the sensitivity at a higher pressure range,Ag particles are doped on the surface of the graphene ox ide.The preparation method comprises immersing the graphene oxide film in a silver ammonia solution,drying it after the immersion time is reached,and then reducing it by using a lightscribe method.It was found by SEM characterization of the prepared sa mple that the particles could adhere to the graphene oxide film and can be reduced together.XRD is then used to characterize whether the resulting particles are silver particles.After the electrical property test,the linearity of Ag-reduced graphene oxide was improved compared with the reduced graphene oxide.At the same time,the sensitivity of Ag-reduced graphene oxide sensor under certain pressure range was significantly improved after pressure test.