Design Of Conductive Composite Based On PEDOT:PSS/Polyvinyl Alcohol/Cellulose And Application Of ECG Sensor Electrodes

The incidence rate of cardiovascular diseases is increasing in modern society.Bioelectrical signals,especially Electrocardiograph(ECG),are important indicators for monitoring the characteristics of human health.Therefore,developing non-invasive,convenient and real-time detection of ECG signals is particularly important.At present,the commonly used ECG sensor electrode is Ag/Ag Cl electrode.As a disposable electrode,the cost is high,and the conductive adhesive is easy to dehydrate and dry,which affects the quality of ECG signal,so it is not suitable for long-term ECG monitoring electrodes.In this project,it is proposed to use rich polymer materials and conductive polymers to prepare flexible,biocompatible and high conductivity electrodes to replace the traditional Ag/Ag Cl electrodes,which can effectively reduce the electrode cost and ensure people's health on the basis of maintaining clear ECG signals.This subject intends to carry out the composite structure design and Performance Research of polymer materials and conductive polymers based on self-assembly and freeze-thaw physical crosslinking technology.Firstly,with cellulose and polyvinyl alcohol as substrates and conductive polymer polythiophene as conductive active material,the conductive electrode was prepared by insitu oxidative polymerization in the green solvent 1-butyl-3-methylimidazole chloride system of cellulose.The microstructure and properties were characterized by scanning electron microscope(SEM),X-ray diffraction energy spectrum(XPS)and field emission energy spectrum(EDS),and the electrical conductivity,electrochemical performance and ECG monitoring performance were tested.The results show that the polyvinyl alcohol/cellulose/PEDOT: PSS(PCPP)composite electrode has good flexibility,low skin contact impedance and comfortable skin contact characteristics.When the addition of EDOT reaches 15%,the electrode can output a stable signal and clearly monitor the characteristic wave of ECG signal.Secondly,in order to further reduce the contact impedance,we can improve the adhesion and adhesion between electrodes and skin.In this study,polyvinyl alcohol(PVA)and carboxymethyl cellulose(CMC)are used as a skeleton to disperse the mixture of polyethylene-3,4-two oxygen thiophene:sodium polystyrene sulfonate(PEDOT:PSS)in hydrogels,forming a continuous interconnected conductive pathway.The prepared skin hydrogel has a conductivity of75 S·cm-1and high water content(more than 80%).It has good mechanical properties and is soft enough to moisturize.It can replace the traditional Ag/Ag Cl electrode with a higher cost.Importantly,this skin like a hydrogel is similar to human tissue.It can form a natural seamless interface between the body and the electro cardio biosensor device,promote the high response of electronic signals acquired under low impedance,and obtain clear,stable and continuous ECG signals.Therefore,the design and Performance Research of the conductive composite electrode can provide a new idea for the development of ECG electrodes.