Research On Preparation And Characteristics Of Flexible Pressure Film Sensor

In modern society,people's demands for health are increasing day by day.Wearable electronic equipment has become more and more widely used in medical treatments such as health monitoring,timely diagnosis and treatment.As one of the components of wearable electronic equipment,pressure sensors have gradually become a hot spot in electronic device research.In recent years,researches on flexible pressure sensors at home and abroad have achieved considerable progress,but the current flexible pressure sensors still can't balance high sensitivity and wide measurement range.Reasonable design of the device structure and selection of pressure-sensitive materials can improve the sensitivity as much as possible when the measurement range is relatively large.This thesis uses polydopamine(PDA)to modify the surface of electrospun polyvinylide ne fluoride(PVDF)to obtain a three-dimensional network structure elastic film frame with excel ent adhesion,and then use polyaniline(PANI)as a conductive filler to deposit on the electrospun fibers of the film evenly.A flexible pressure-sensitive film with excelle nt performance was successfully prepared,and its performance and application are studied.In order to further improve the performance of the sensor,on the basis of the previous work,PANI@PDA/PVDF composite nanofiber film is doped with reduced graphene oxide(rGO),and its performance and application research are also studied.The main work content and research results are as follows:1.Electrospinning technology is used to realize the preparation of the sensor material base frame,and the aniline monomer is polymerized in situ on the PDA/PVDF film frame by chemical method.PANI@PDA/PVDF thin-film sensitive materials were used to fabricate resistance-type flexible pressure sensors with a"sandwich"structure.In order to obtain the better device performance,controlling groups of spinning time and relative volume fraction of aniline monomer were set up.The optimal spinning time was 6minutes by means of characterization and performance testing.The relative volume fraction of aniline monomer is 0.39%.And this set of parameters is used in the preparation of the final device,and the sensor obtained has a wide working range(0-70 k Pa),high sensitivity(10.1[k Pa]^-1),low operating voltage of 1 V,low power consumption and excel ent stability.At the same time,it can be used to detect weak pulses and monitor various human physiological movement behaviors.2.PANI@rGO/PDA/PVDF sensor was obtained by doping rGO on the basis of the preparation in the previous chapter.Compared with the PANI@PDA/PVDF sensor,the electrical conductivity has been significantly improved.At a fixed voltage of 1 V,the current output of the PANI@rGO/PDA/PVDF sensor is as high as 200?A.In terms of sensitivity,the PANI@rGO/PDA/PVDF sensor has reached 12.54[k Pa]^-1 in the low pressure range of 0-10 k Pa,and the linearity is better.In terms of response,the PANI@rGO/PDA/PVDF sensor responds more quickly to external pressure stimuli.At the same time,the sensor can also be used for human physiological movement monitor ing,with broad application prospects.