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20. [Small] Engineering Tough Metallosupramolecular Hydrogel Films with Kirigami Structures for Compliant Soft Electronics
作者:H C Yu, X P Hao, C W Zhang, S Y Zheng, M Du, S Liang, Z L Wu*, Q Zheng*
关键字:Tough hydrogel, Soft electronics
论文来源:期刊
具体来源:Small
发表时间:2021年
A simple and effective approach is demonstrated to fabricate tough metallosupramolecular hydrogel films of poly(acrylic acid) by one‐pot photopolymerization of the precursor solution in the presence of Zr4+ ions that form coordination complexes with the carboxyl groups and serve as the physical crosslinks of the matrix. Both as‐prepared and equilibrated hydrogel films are transparent, tough, and stable over a wide range of temperature, ionic strength, and pH. The thickness of the films can be easily tailored with minimum value of ≈7 μm. Owing to the fast polymerization and gelation process, kirigami structures can be facilely encoded to the gel films by photolithographic polymerization, affording versatile functions such as additional stretchability and better compliance of the planar films to encapsulate objects with sophisticated geometries that are important for the design of soft electronics. By stencil printing of liquid metal on the hydrogel film with a kirigami structure, the integrated soft electronics shows good compliance to cover curved surfaces and high sensitivity to monitor human motions. Furthermore, this strategy is applied to diverse natural and synthetic macromolecules containing carboxyl groups to develop tough hydrogel films, which will open opportunities for the applications of hydrogel films in biomedical and engineering fields. Tough hydrogel films with controllable thickness are facilely developed by one‐pot photopolymerization with in situ formation of carboxyl–Zr4+ coordination complexes serving as physical crosslinks of the gel matrix. Kirigami structures are created in the hydrogel films by photolithography, affording additional stretchability, better compliance, and versatile design of soft electronics to wrap sophisticated curved surfaces.