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Highly Stretchable, Elastic, and Ionic Conductive Hydrogel for Artificial Soft Electronics
Author(s) -
Zhou Yang,
Wan Changjin,
Yang Yongsheng,
Yang Hui,
Wang Shancheng,
Dai Zhendong,
Ji Keju,
Jiang Hui,
Chen Xiaodong,
Long Yi
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201806220
Subject(s) - materials science , electrical conductor , self healing hydrogels , ionic conductivity , composite material , artificial muscle , ionic bonding , flexible electronics , electrolyte , polyvinyl alcohol , nanotechnology , ion , electrode , polymer chemistry , actuator , computer science , quantum mechanics , chemistry , artificial intelligence , physics
High conductivity, large mechanical strength, and elongation are important parameters for soft electronic applications. However, it is difficult to find a material with balanced electronic and mechanical performance. Here, a simple method is developed to introduce ion‐rich pores into strong hydrogel matrix and fabricate a novel ionic conductive hydrogel with a high level of electronic and mechanical properties. The proposed ionic conductive hydrogel is achieved by physically cross‐linking the tough biocompatible polyvinyl alcohol (PVA) gel as the matrix and embedding hydroxypropyl cellulose (HPC) biopolymer fibers inside matrix followed by salt solution soaking. The wrinkle and dense structure induced by salting in PVA matrix provides large stress (1.3 MPa) and strain (975%). The well‐distributed porous structure as well as ion migration–facilitated ion‐rich environment generated by embedded HPC fibers dramatically enhances ionic conductivity (up to 3.4 S m −1 , at f = 1 MHz). The conductive hybrid hydrogel can work as an artificial nerve in a 3D printed robotic hand, allowing passing of stable and tunable electrical signals and full recovery under robotic hand finger movements. This natural rubber‐like ionic conductive hydrogel has a promising application in artificial flexible electronics.