Beijing National Laboratory of Molecular Science (BNLMS), Key Laboratory of Organic Solid, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Adv Mater. 2017 Dec;29(47). doi: 10.1002/adma.201704253. Epub 2017 Oct 30.
Ionogels offer great potential for diverse electric applications. However, it remains challenging to fabricate high-performance ionogels with both good mechanical strength and high conductivity. Here, a new kind of transparent ionogel with both good mechanical strength and high conductivity is designed via locking a kind of free ionic liquid (IL), i.e., 1-ethyl-3-methylimidazolium dicyanamide ([EMIm][DCA]), into charged poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS)-based double networks. On the one hand, the charged PAMPS double network provides good mechanical strength and excellent recovery property. On the other hand, the free [EMIm][DCA] locked in the charged double network through electrostatic interaction offers ionic conductivity as high as ≈1.7-2.4 S m at 25 °C. It is demonstrated that the designed ionogel can be successfully used for a flexible skin sensor even under harsh conditions. Considering the rationally designed chemical structures of ILs and the diversity of charged polymer networks, it is envisioned that this strategy can be extended to a broad range of polymer systems. Moreover, functional components such as conducting polymers, 0D nanoparticles, 1D nanowires, and 2D nanosheets can be introduced into the polymer systems to fabricate diverse novel ionogels with unique functions. It is believed that this design principle will provide a new opportunity to construct next-generation multifunctional ionogels.
离子凝胶在各种电气应用中具有巨大的潜力。然而，制造具有良好机械强度和高导电性的高性能离子凝胶仍然具有挑战性。在这里，通过将一种游离离子液体（IL），即 1-乙基-3-甲基咪唑二氰胺([EMIm][DCA])，锁定在带电荷的聚（2-丙烯酰胺基-2-甲基-1-丙磺酸）（PAMPS）基双网络中，设计出了一种新型透明离子凝胶，兼具良好的机械强度和高导电性。一方面，带电荷的 PAMPS 双网络提供了良好的机械强度和优异的恢复性能。另一方面，通过静电相互作用锁定在带电荷的双网络中的游离 [EMIm][DCA] 提供了高达 ≈1.7-2.4 S m 的离子电导率，在 25°C 下。结果表明，即使在恶劣条件下，所设计的离子凝胶也可以成功用于柔性皮肤传感器。考虑到 ILs 的合理设计化学结构和带电荷聚合物网络的多样性，可以预见这种策略可以扩展到广泛的聚合物系统。此外，还可以将功能性组件，如导电聚合物、0D 纳米粒子、1D 纳米线和 2D 纳米片引入聚合物系统中，以制造具有独特功能的各种新型离子凝胶。相信这一设计原则将为构建下一代多功能离子凝胶提供新的机会。
