Preparation method of conductive hydrogel sensor based on polyacrylamide-silk fibroin

Abstract

The invention discloses a preparation method of a conductive hydrogel sensor based on polyacrylamide-silk fibroin, belonging to the field of flexible wearable electronic devices. The preparation method comprises the following steps: cutting cocoon shells obtained after pupa removal of mulberry silk worm cocoons into small pieces, putting the small pieces into a boiled sodium bicarbonate solution for boiling, and putting dried silk fibroin fibers obtained after drying into a lithium bromide solution for dissolving and dialysis so as to obtain a silk fibroin solution; dissolving acrylamide intodeionized water; then adding ammonium persulfate and N,N'-methylene bisacrylamide, and carrying out uniform mixing under stirring to obtain a polyacrylamide solution; sequentially adding the silk fibroin solution, a graphene oxide solution and a poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate solution into the polyacrylamide solution, carrying out uniform mixing, injecting the obtained mixture into a mold, and carrying out heating to obtain the conductive hydrogel; and connecting wires to two ends of the conductive hydrogel to obtain the conductive hydrogel sensor. The conductive hydrogel sensor is simple in method, high in elasticity, wide in response range, suitable for large-scale production, sensitive in reaction and capable of testing stretching and compressing signals at the same time.

Description

technical field [0001] The invention relates to flexible wearable electronic devices, in particular to a method for preparing a polyacrylamide-silk fibroin conductive hydrogel sensor. Background technique [0002] Due to its special properties, flexible wearable electronic devices have received extensive attention in recent years, especially in the field of flexible sensors. Materials used to prepare flexible wearable sensors must have good flexibility, good electrical conductivity and other characteristics. [0003] The current preparation of flexible sensors generally consists of conductive components (such as carbon nano, graphene oxide and metal nanowires) dispersed in a substrate with good elasticity (such as hydrogel and silicone rubber) (Y.Cai, J.Shen ,Z.Dai,X.Zang,Q.Dong,G.Guan,L.J.Li,W.Huang and X.Dong,Advanced materials,2017,29), they generally have a wide sensing range, high sensitivity and mechanical stability. However, their function is often relatively singl...

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Problems solved by technology

However, their functions are often relatively single, as sensors they cannot simultaneously test the signals generated by tension and compression

Therefore, they cannot be used to simultaneously distinguish many human signals (such as joint bending and facial expression changes), which greatly limits their application range (M.Xu, J.Qi, F.Liand Y.Zhang, Nanoscale, 2018,10,5264-5271)

[0004] Polyacrylamide has been widely used in the medical field due to its good biocompatibility and adjustable elasticity, but the mechanical properties of pure acrylamide are still poor, and it needs to be cross-linked with other materials to obtain good elastomers

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