Yu Yuanhang, Yi Peng, Xu Wenbin, Sun Xin, Deng Gao, Liu Xiaofang, Shui Jianglan, Yu Ronghai
School of Materials Science and Engineering, Beihang University, Beijing, 100191, People's Republic of China.
Science and Technology on Optical Radiation Laboratory, Beijing Institute of Environmental Features, Beijing, 100854, People's Republic of China.
Nanomicro Lett. 2022 Mar 21;14(1):77. doi: 10.1007/s40820-022-00819-3.
Conductive hydrogels have potential applications in shielding electromagnetic (EM) radiation interference in deformable and wearable electronic devices, but usually suffer from poor environmental stability and stretching-induced shielding performance degradation. Although organohydrogels can improve the environmental stability of materials, their development is at the expense of reducing electrical conductivity and thus weakening EM interference shielding ability. Here, a MXene organohydrogel is prepared which is composed of MXene network for electron conduction, binary solvent channels for ion conduction, and abundant solvent-polymer-MXene interfaces for EM wave scattering. This organohydrogel possesses excellent anti-drying ability, low-temperature tolerance, stretchability, shape adaptability, adhesion and rapid self-healing ability. Two effective strategies have been proposed to solve the problems of current organohydrogel shielding materials. By reasonably controlling the MXene content and the glycerol-water ratio in the gel, MXene organohydrogel can exhibit exceptionally enhanced EM interference shielding performances compared to MXene hydrogel due to the increased physical cross-linking density of the gel. Moreover, MXene organohydrogel shows attractive stretching-enhanced interference effectiveness, caused by the connection and parallel arrangement of MXene nanosheets. This well-designed MXene organohydrogel has potential applications in shielding EM interference in deformable and wearable electronic devices.
导电水凝胶在屏蔽可变形和可穿戴电子设备中的电磁（EM）辐射干扰方面具有潜在应用，但通常存在环境稳定性差和拉伸导致屏蔽性能下降的问题。尽管有机水凝胶可以提高材料的环境稳定性，但其发展是以降低电导率从而削弱电磁干扰屏蔽能力为代价的。在此，制备了一种MXene有机水凝胶，它由用于电子传导的MXene网络、用于离子传导的二元溶剂通道以及用于电磁波散射的丰富的溶剂 - 聚合物 - MXene界面组成。这种有机水凝胶具有优异的抗干燥能力、低温耐受性、拉伸性、形状适应性、粘附性和快速自愈能力。已经提出了两种有效的策略来解决当前有机水凝胶屏蔽材料的问题。通过合理控制凝胶中MXene的含量和甘油 - 水比例，与MXene水凝胶相比，MXene有机水凝胶由于凝胶物理交联密度的增加而表现出异常增强的电磁干扰屏蔽性能。此外，由于MXene纳米片的连接和平行排列，MXene有机水凝胶表现出有吸引力的拉伸增强干扰效果。这种精心设计的MXene有机水凝胶在屏蔽可变形和可穿戴电子设备中的电磁干扰方面具有潜在应用。
