Preparation And Properties Of PEDOT:PSS Doped Multifunctional Hydrogels

In recent years,the application of flexible strain sensors in the field of humancomputer interaction and human health monitoring has received widespread attention,in which hydrogel is an important material for the preparation of flexible sensors,but the clinical application of traditional hydrogel sensors is greatly limited due to t he inherent brittleness,poor stretchability and inability to deform arbitrarily,and the lack of easy connection with silicon semiconductor materials for signal transmissio n.This thesis prepared hydrogel strain sensor materials with high stretchability and sensitivity to address these issues.Specifically,the research is as follows.1.In this thesis,a conductive polymer hydrogel consisting of gelatin(Gel),pol y(acrylamide-[2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide)[P(Am-SBMA)] and poly(3,4 ethylene dioxythiophene: polystyrene sulfonic acid sodi um)(PEDOT: PSS)was developed.In this hydrogel,acrylamide and gelatin allow f or homogeneous dispersion of the conductive polymer in the presolution,and the in tegration of amphoteric poly(SBMA)and the conductive polymer PEDOT: PSS allo ws for optimized charge transfer via an optimal conductive pathway,and secondly,the hydrogen bonding interactions,electrostatic interactions and intermolecular chain entanglement between the conductive polymer hydrogels confer superior stretchabili ty(strain ≈ 1650%),high tensile strength(380 k Pa)and good fatigue resistance.In addition,the conductive polymer hydrogel has good strain sensitivity(GF ≈ 1.37,150%-300%),a fast response time(100ms),and durability(>300 cycles),allowing t he preparation of strain sensors for stable transmission of signals to monitor human movements(elbow,finger,wrist movements)and remote output through connection to silicon integrated circuits.The research shows that the hydrogel sensor material has potential applications in the field of human-computer interaction and personal h ealth monitoring.2.The thesis research will also use acrylic acid to prepare conductive polymer hydrogels consisting of gelatin,poly(acrylic acid-[2-(methacryloyloxy)ethyl]dimethyl-(3-sulphonatopropyl)ammonium hydroxide)[P(AA-SBMA)] and poly(3,4 ethylene dio xythiophene: polystyrene sulfonic acid sodium)(PEDOT: PSS).The carboxyl group of acrylic acid increases the adhesion of the hydrogel to the human body(e.g.fing ers)(up to ～302 N/m adhesion to the skin)and increases the strain of the hydroge l to 2244%,secondly,soaking the organogel in a binary solvent of glycerol and wa ter increases the resistance to water loss,and increases the resistance of the organ ogel to low temperatures.In addition,the organogel has a high strain sensitivity(G F ≈ 4.09),which allows for more accurate human signal recognition.