writer：Sun FC, Huang XY, Wang X, Liu H, Wu YG, Du FP, Zhang YF*
keywords：Poly(acrylamide-co-methacrylic acid), PEDOT:PSS Adhesio Electrical conductivity, Tensile properties, Strain sensor
source：期刊
specific source：Colloids and Surfaces A: Physicochemical and Engineering Aspects
Issue time：2021年

With increasing interest and demand for wearable electronics and healthcare devices, fabricating a conductive hydrogel sensor combining high transparency, self-adhesion and toughness is necessary but remains challenging. In this paper, we developed transparent, adhesive, stretchable and tough hydrogels via semi-interpenetrating network (SIPN) strategy. The SIPN consists of linear poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)  and  chemically  cross-linked  poly(acrylamide-co-methacrylic  acid).  Here,  methacrylic  acid  was used to improve the self-adhesion, tensile properties and the electrical conductivity of the hydrogel. The fabri-cated hydrogels exhibit high transparency, robust adhesion to various substrate surfaces as well as skin, relative high stretchability and tensile strength. Furthermore, the hydrogel also exhibits excellent linear response as a flexible  strain  sensor  to  detect  human  motions  and  tiny  physiological  signals.  It  is  envisioned  that  the  SIPN strategy and the introduction of methacrylic acid provide a new way for developing high performance conductive hydrogel for strain sensors.