The Study About Preparation Of Functional Graphene Film And Its Application In Wearable Sensors

With the development of modern society,people focus on the healthy lifestyle more closely.Achieving the convenient,real-time health monitoring method and early diagnosis of diseases have become urgent for the future.The wearable sensors have drawn more and more attention because its operations are simple and real-time detections are available.It is significant to develop new flexible materials to build wearable sensors.Due to the unique two-dimensional nanostructure,high specific surface area,good conductivity and flexibility,graphene has high application value in biomedicine,electronic device and chemical industry.Therefore,in this paper,a variety of functionalized graphene materials were prepared,including graphene self-supporting films,porphyrin-functionalized graphene films,graphene films with porous microstructures and graphene conductive fabric.At the same time,the characteristics of these functionalized graphene materials were studied,including the sensing characteristics to VOCs and the response to stress.The research contents in this paper are as follows:1.The flexible graphene self-supporting film was prepared.Based on this work,the porphyrin-functionalized graphene films were prepared.Their responses to VOC gases were detected.Gas sensing arrays were constructed by four different porphyrin-functionalized graphene films,and its response to different VOC gases were tested.2.The porous graphene film was prepared and its relative resistance changes under various strain conditions were investigated.The graphene sensing array was prepared by combining the porous graphene films with the porphyrin-functionalized graphene array,which could detect the VOC markers and physiological signals simultaneously.Analyzing the signal from porphyrin-functionalized rGO sensing array by pattern recognition,the VOC biomarkers from diabetic patients,nephrotic patients and healthy people could be distinguished.3.The flexible graphene fabric was prepared and its response to stress was studied.The color sensitive material,polydiacetylene array was added on the flexible graphene fabric for constructing the multifunctional wearable sensing array,which could detect the VOCs and physiological signals simultaneously.Our studies enrich the research contents in functionalized graphene materials,and the study in gas sensing properties and stress response characteristics of functionalized graphene materials develop the application of graphene in biomedical research fields.