LAUSR

The elastic conductor is crucial in wearable electronics and soft robotics. The ideal intrinsic elastic bulk conductors show uniform three-dimensional conductive networks and stable resistance during large stretch. A challenge is that the variation of resistance is high under deformation due to disconnection of conductive pathway for bulk elastic conductors. Our strategy is to introduce buckled structure into the conductive network, by self-assembly of a carbon nanotube layer on the interconnecting micropore surface of a prestrained foam, followed by strain relaxation. Both unfolding of buckles and flattening of micropores contributed to the stability of the resistance under deformation (2.0% resistance variation under 70% strain). Microstructural analysis and finite element analysis illustrated different patterns of two-dimensional buckling structures could be obtained due to the imperfections in the conductive layer. Applications as all-directional interconnects, stretchable electromagnetic interference shielding and electrothermal tumor ablation were demonstrated. 弹性导体在可穿戴电子设备和软机器人中至关重要. 理想的本征弹性体导体在大形变下显示出均匀的三维导电网络结构和稳定的电阻变化. 其面临的一个挑战是, 由于体弹性导体在形变下导电路径断开, 电阻变化很大. 我们的策略是将具有互连微孔的泡沫进行预拉伸, 通过碳纳米管在微孔表面自组装形成导电层, 随后释放预应变, 从而在导电网络中引入褶皱结构. 在拉伸过程中, 褶皱和微孔的变形都有助于电阻的稳定(在70%应变下电阻变化2.0%). 微观结构和有限元分析表明, 由于导电层中的缺陷, 可以获得不同形貌的二维褶皱结构. 我们展示了其在全方位电气互连、 可拉伸电磁屏蔽和电热肿瘤消融方面的应用.