材料科学
自愈水凝胶
乙二醇
聚乙烯醇
离子键合
紫外线
离子电导率
化学工程
聚合物
导电体
紫外线
复合材料
光电子学
纳米技术
离子
高分子化学
电极
电解质
有机化学
化学
物理化学
工程类
作者
Jie Wen,Jia Tang,Ning Hu,Ning Hu,Yuanyuan Zhu,Yumei Gong,Chaohe Xu,Qiannan Zhao,Xiaoping Jiang,Xiaolin Hu,Lei Ling,Dan Wu,Tao Huang
标识
DOI:10.1002/adfm.202011176
摘要
Abstract Conductive polymer hydrogels are receiving considerable attention in applications such as soft robots and human‐machine interfaces. Herein, a transparent and highly ionically conductive hydrogel that integrates sensing, UV‐filtering, water‐retaining, and anti‐freezing performances is achieved by the organic combination of tannic acid‐coated hydroxyapatite nanowires (TA@HAP NWs), polyvinyl alcohol (PVA) chains, ethylene glycol (EG), and metal ions. The highly ionic conductivity of the hydrogel enables tensile strain, pressure, and temperature sensing capabilities. In particular, in terms of the hydrogel strain sensors based on ionic conduction, it has high sensitivity (GF = 2.84) within a wide strain range (350%), high linearity ( R 2 = 0.99003), fast response (≈50 ms) and excellent cycle stability. In addition, the incorporated TA@HAP NWs act as a nano‐reinforced filler to improve the mechanical properties and confer a UV‐shielding ability upon the hydrogel due to its size effect and the characteristics of absorbing ultraviolet light waves, which can reflect and absorb short ultraviolet rays and transmit visible light. Meanwhile, owing to the water‐locking effect between EG and water molecules, the hydrogel exhibits freezing resistance at low temperatures and moisture retention at high temperatures. This biocompatible and multifunctional conductive hydrogel provides new ideas for the design of novel ionic skin devices.
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