State Key Laboratory of Fluid Power and Mechatronic Systems, Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering , Zhejiang University , Hangzhou 310028 , China.
ACS Appl Mater Interfaces. 2018 Apr 25;10(16):13685-13692. doi: 10.1021/acsami.8b01873. Epub 2018 Apr 12.
Conductive polymer hydrogels (CPHs) that combine the unique properties of hydrogels and electronic properties of conductors have shown their great potentials in wearable/implantable electronic devices, where materials with remarkable mechanical properties, high conductivity, and easy processability are demanding. Here, we have developed a new type of polyion complex/polyaniline (PIC/PAni) hybrid hydrogels that are tough, conductive, and can be facilely patterned. The incorporation of conductive phase (PAni) into PIC matrix through phytic acid resulted in hybrid gels with ∼65 wt % water; high conductivity while maintaining the key viscoelasticity of the tough matrix. The gel prepared from 1 M aniline (Ani) exhibited the breaking strain, fracture stress, tensile modulus, and electrical conductivity of 395%, 1.15 MPa, 5.31 MPa, and 0.7 S/m, respectively, superior to the most existing CPHs. The mechanical and electrical performance of PIC/PAni hybrid hydrogels exhibited pronounced rate-dependent and self-recovery behaviors. The hybrid gels can effectively detect subtle human motions as strain sensors. Alternating conductive/nonconductive patterns can be readily achieved by selective Ani polymerization using stencil masks. This facile patterning method based on PIC/PAni gels can be readily scaled up for fast fabrication of wavy gel circuits and multichannel sensor arrays, enabling real-time monitoring of the large-extent and large-area deformations with various sensitivities.
导电高分子水凝胶（CPHs）结合了水凝胶的独特性质和导体的电子性质，在可穿戴/可植入电子设备中显示出巨大的潜力，这些设备需要具有出色机械性能、高导电性和易于加工的材料。在这里，我们开发了一种新型聚离子复合物/聚苯胺（PIC/PAni）杂化水凝胶，具有坚韧、导电和易于图案化的特点。通过植酸将导电相（PAni）掺入 PIC 基质中，得到了具有约 65wt%水的杂化凝胶；保持坚韧基质的关键粘弹性的同时，还具有高导电性。由 1M 苯胺（Ani）制备的凝胶表现出 395%的断裂应变、1.15MPa 的断裂应力、5.31MPa 的拉伸模量和 0.7S/m 的电导率，优于大多数现有的 CPHs。PIC/PAni 杂化水凝胶的机械和电气性能表现出明显的速率依赖性和自恢复行为。杂化凝胶可用作应变传感器，有效检测微妙的人体运动。通过使用掩模选择性聚合 Ani，可以轻松实现导电/非导电图案的交替。这种基于 PIC/PAni 凝胶的简单图案化方法可以很容易地扩展到大尺寸的波浪形凝胶电路和多通道传感器阵列的快速制造，实现具有各种灵敏度的大变形和大面积的实时监测。
