Abstract The construction of advanced nanocomposite structures is a principal strategy to realize the electrical and mechanical functionalities of graphene for flexible electronic applications. Herein, two types of conductive and stretchable networks were fabricated by incorporation of polyurethane and silicone elastomers into highly porous and interconnected graphene gels. The layer-by-layer assembly of the graphene aerogel was solution-processable at room temperature, which offers a wide processing window for the solvent engineering and infiltration of polymers to improve wettability. Effects of graphene-polymer interfacial properties were investigated by their cross-sectional morphologies and viscoelastic analyses to elucidate the packing density, dispersion state, surface chemistry, polymer distribution and chain mobility. The polymer-infiltrated graphene network exhibited a high conductivity of ~100 S/m at a low filler content of 0.8 wt%. Given the excellent structural integrity, the graphene composites demonstrated unique electrical properties under stretching and bending conditions. Particularly, a maximum conductivity of 47 S/m was achieved under 50% tensile strain and the resistance deviation was less than 5% upon 500 bending cycles. The proposed design of graphene architecture and polymer infiltration techniques serve to pave the way for the next-level development of graphene electronics.

中文翻译：

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基于互连石墨烯气凝胶的可拉伸导电聚合物纳米复合材料的制备

摘要 构建先进的纳米复合结构是实现石墨烯在柔性电子应用中的电气和机械功能的主要策略。在此，通过将聚氨酯和有机硅弹性体结合到高度多孔且相互连接的石墨烯凝胶中来制造两种类型的导电和可拉伸网络。石墨烯气凝胶的逐层组装在室温下可进行溶液加工，这为溶剂工程和聚合物渗透提供了宽阔的加工窗口，以提高润湿性。通过横截面形态和粘弹性分析来研究石墨烯-聚合物界面性质的影响，以阐明堆积密度、分散状态、表面化学、聚合物分布和链迁移率。聚合物渗透的石墨烯网络在 0.8 wt% 的低填料含量下表现出~100 S/m 的高电导率。鉴于优异的结构完整性，石墨烯复合材料在拉伸和弯曲条件下表现出独特的电性能。特别是，在 50% 拉伸应变下实现了 47 S/m 的最大电导率，并且在 500 次弯曲循环后电阻偏差小于 5%。石墨烯结构和聚合物渗透技术的拟议设计为石墨烯电子学的下一级发展铺平了道路。在 50% 拉伸应变下达到 47 S/m 的最大电导率，并且在 500 次弯曲循环后电阻偏差小于 5%。石墨烯架构和聚合物渗透技术的拟议设计为石墨烯电子学的下一级发展铺平了道路。在 50% 拉伸应变下达到 47 S/m 的最大电导率，并且在 500 次弯曲循环后电阻偏差小于 5%。石墨烯结构和聚合物渗透技术的拟议设计为石墨烯电子学的下一级发展铺平了道路。