Fabrication And Printing Process Of Flexible Electronic Film Based On Paper And Fabric

In recent ten years,due to the development of the electronics industry,screen printing has become more and more widely used in the electronics industry.Screen printing greatly increases production efficiency and reduces product costs.This technology has been applied to electronic components such as resistors,capacitors,potentiometers,filters,etc.The flexible electronic film prepared by screen printing has broad application prospects in surface decoration,membrane switch,printed circuit,thick film circuit,liquid crystal display and touch switch.This paper focuses on the preparation and performance characterization of flexible electronic films.Specifically,a flexible electronic film has obtained by substrate modification methods and screen-printing processes,which further explore its application in printed circuit boards,bio-detection chips and other fields.A flexible electronic film has been prepared on paper/fabric using twomodification method(PVA,PVC)and conductive silver ink.The microscopic characteristics of the film are characterized by scanning electron microscopy,including the original morphology of the substrate,the middle-modified layer and the sintered layer of surface silver particles.Electrical characterization was conducted using a digital four-point probe tester,including mechanical flexibility,stability in water and adhesion.The flexible electronic film still exhibits excellent electrical conductivity after 100,000 times of bending,soaking in water for 120 h and bonding more than 20 times.To fabricate a patterned flexible electronic film,this work uses polyvinyl chloride(PVC)glue to modify chemical fiber,silk and paper.The modification process of PVC glue is not only simple,but also beneficial to screen printing.It is suitable for printing due to the small pore of silk,chemical fiber and paper.To optimize process parameters,this work designs orthogonal experiments and uses SPSS to process data,which reduce defects of screen printing and improve printing accuracy.In addition,we prepared three kinds of silver pastes so as to obtain different printing films,which their electrical and mechanical properties were measured.The conductivity and adhesion properties of the prepared alcohol/resin-based silver paste were comparable to those of commercial silver paste.In this thesis,we initially explored the application value of this flexible electronic film.The first study was to design and print circuits on substrate.For fabricating LED array light emitting device,this circuit could be decorated LED by surface mounting technique.The temperature and strain distribution of the surface mounting resistors are simulated and analyzed,which provides theoretical guidance for the experimental testing.The second study was to design and prepare screen printed electrodes for glucose detection.As the printed electrodes exhibit excellent electron transport properties,potassium ferricyanide can undergo a redox reaction on the surface of the electrode.The oxidation of glucose by the electrode immobilized glucose oxidase is significantly enhanced.Compared with the electrode without enzyme,potassium ferricyanide can obviously catalyze the oxidation of glucose after adding enzyme.After adding enzyme,the peak current increased by 3?4 times.This work demonstrates that the technology have potential value for biological and biomedical research.