Abstract：
Conductive hydrogels (CHs) are emerging materials for next generation sensing systems in flexible electronics. However, the fabrication of competent CHs with excellent stretchability, adhesion, self-healing, photothermal conversion, multisensing, and environmental stability remains a huge challenge. Herein, a nanocomposite organohydrogel with the above features is constructed by in situ copolymerization of zwitterionic monomer and acrylamide in the existence of carboxylic cellulose nanofiber-carrying reduced graphene oxide (rGO) plus a solvent displacement strategy. The synergy of abundant dipole-dipole interactions and intermolecular hydrogen bonds enables the organohydrogel to exhibit high stretchability, strong adhesion, and good self-healing. The presence of glycerol weakens the formation of hydrogen bonds between water molecules, endowing the organohydrogel with excellent environmental stability (-40 to 60 °C) to adapt to different application scenarios. Importantly, the multimodal organohydrogel presents excellent sensing behavior, including a high gauge factor of 16.3 at strains of 400-1440% and a reliable thermal coefficient of resistance (-4.2 °C-1) over a wide temperature widow (-40 to 60 °C). Moreover, the organohydrogel displays a highly efficient and reliable photothermal conversion ability due to the favorable optical absorbing behavior of rGO. Notably, the organohydrogel can detect accurate human activities at ambient temperature, demonstrating potential applications in flexible intelligent electronics.
摘要：
导电水凝胶（CH）是用于柔性电子产品中下一代传感系统的新兴材料。然而,制造具有优异拉伸性的合格CHs，附着力,自我修复,光热转换，多传感,环境稳定仍然是一个巨大的挑战。在这里，具有上述特征的纳米复合有机水凝胶是通过在携带羧基纤维素纳米纤维的还原氧化石墨烯(rGO)和溶剂置换策略的存在下,两性离子单体和丙烯酰胺的原位共聚而构建的。丰富的偶极-偶极相互作用和分子间氢键的协同作用使有机水凝胶具有高的拉伸性，附着力强,良好的自我修复。甘油的存在削弱了水分子之间氢键的形成，赋予有机水凝胶优异的环境稳定性（-40至60°C），以适应不同的应用场景。重要的是,多峰有机水凝胶表现出优异的传感行为，包括在400-1440％的应变下高达16.3的高应变系数，以及在宽温度范围（-40至60°C）内可靠的热阻系数（-4.2°C-1）。此外，由于rGO的有利的光学吸收行为,有机水凝胶显示出高效和可靠的光热转化能力。值得注意的是,有机水凝胶可以在环境温度下检测准确的人类活动，展示在柔性智能电子产品中的潜在应用。
