Super Tough and Intelligent Multibond Network Physical Hydrogels Facilitated by Ti3C2Tx MXene Nanosheets
Super Tough and Intelligent Multibond Network Physical Hydrogels Facilitated by Ti3C2Tx MXene Nanosheets
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Ti3C2Tx MXene 纳米片促进的超坚韧智能多重键网络物理水凝胶
DOI：
10.1021/acsnano.1c10151
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发表时间：
2021-12-27
期刊：
影响因子：
17.1
通讯作者：
Xie, Xu-Ming
中科院分区：
文献类型：
--
作者：
Li, Yuxi;Yan, Jianhui;Xie, Xu-Ming
可拉伸和导电的水凝胶已成为智能和柔性电子设备的有希望的候选者。在此，基于多重键网络（MBN）设计原理，制备了超坚韧且高度可拉伸的纳米复合物理水凝胶，其中2D Ti3C2Tx MXene纳米片充当多功能交联剂和有效的应力传递中心。此外，通过控制 Fe3+ 渗透制备的 MXene-聚丙烯酸（PAA）-Fe3+ MBN 物理水凝胶表现出突出且均衡的机械性能（例如，拉伸强度可达 10.4 MPa，断裂伸长率可高达 3080%），这归因于 MXene 纳米片和 PAA 链之间具有密集的 Fe3+ 介导的配位交联和稀疏的双交联网络。 PAA 链之间存在羧基-Fe3+ 交联。此外，导电MXene纳米片和大量离子赋予水凝胶优异的电导率（高达3.8 S m(-1)）、应变敏感性（高应变系数10.09）和自修复性能，显示出作为智能柔性电子器件的巨大前景。
Stretchable and conductive hydrogels have emerged as promising candidates for intelligent and flexible electronic devices. Herein, based on a multibond network (MBN) design rationale, super tough and highly stretchable nanocomposite physical hydrogels are prepared, where 2D Ti3C2Tx MXene nanosheets serve as multifunctional cross-linkers and effective stress transfer centers. Further MXene-poly(acrylic acid) (PAA)-Fe3+ MBN physical hydrogels fabricated through controlled permeation of Fe3+ exhibit prominent and well-balanced mechanical properties (e.g., the tensile strength can reach 10.4 MPa and elongation at break can be as high as 3080%), attributed to the dual cross-linking network with dense Fe3+-mediated coordination cross-links between MXene nanosheets and PAA chains and sparse carboxy-Fe3+ cross-links between PAA chains. Moreover, both conductive MXene nanosheets and numerous ions endow the hydrogels with superior conductivity (up to 3.8 S m(-1)), strain sensitivity (high gauge factor of 10.09), and self-healing performance, showing great prospect as intelligent flexible electronics.