A wearable strain sensor based on superhydrophobic and conductive composite hydrogel

Abstract

The present invention provides a wearable strain sensor based on super-hydrophobic and conductive composite hydrogel. By uniformly depositing micro-silica particles on the surface of a stretched elastomer Ecoflex, a super-hydrophobic film is prepared as the outer layer of the wearable sensor. The film can maintain super-hydrophobic stability under stretching conditions, and the polymer network P(AAm-co-HEMA)-MXene of the hydrogel is covalently grafted to the elastomer (polysiloxane) chain to obtain a composite hydrogel with strong bonding at the interface between the hydrogel and the elastomer layer. At the same time, nanosilver is added to the hydrogel to ensure its antibacterial ability, and the self-adhesive function of the hydrogel is achieved by increasing the reaction temperature. Finally, a silicone adhesive is used to adhere the multifunctional conductive hydrogel on the wearable sensor having the Ecoflex film as the inner layer to the super-hydrophobic film. Thus, a multifunctional strain-sensitive sensor with a super-hydrophobic function in the outer layer and antibacterial and self-adhesive properties in the inner layer is obtained.

Images