Abstract Accurately controlling the electrical conductivity of wrinkled graphene or graphene oxide (GO) structures is challenging due to the complex sheet-to-sheet interactions and hierarchical interactions at the nanoscale. In this paper, wrinkled GO films with predictable electrical conductivity by precisely controlling thickness ranging from 0.69 to 1.68 μm were fabricated with a thermal process where a GO-coated polystyrene shrink film was isotropically shrunk. Theoretical and experimental results show consistent dependence of the wrinkle wavelength on the GO film thickness. Beyond a certain thickness threshold, poorly wrinkled structures were formed as GO sheets started delaminating from the shrink films. A coarse-grain molecule model based on molecular dynamic simulation principles was developed to understand the formation of the wrinkles, and establish a relationship between GO thickness and the wrinkle wavelength generated. The electrical resistance was found to decrease when the thickness of the GO films increases. The formed composite film can maintain a stable electrical conductivity after experiencing up to 1000 stretching-release cycles under 10% strain. With controllable electrical conductivity, the reported composites can offer potential applications as a strain sensor with tuneable sensing range and high durability.

中文翻译：

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调整微皱石墨烯薄膜以获得可控电导率的可拉伸导体

摘要 由于纳米尺度上复杂的片对片相互作用和分层相互作用，准确控制起皱石墨烯或氧化石墨烯 (GO) 结构的电导率具有挑战性。在本文中，通过精确控制 0.69 至 1.68 μm 的厚度范围来制备具有可预测导电性的皱纹 GO 薄膜，其中 GO 涂层的聚苯乙烯收缩薄膜各向同性收缩。理论和实验结果表明皱纹波长对 GO 膜厚度的依赖性一致。超过一定的厚度阈值，当 GO 片材开始从收缩膜上分层时，就会形成皱缩不良的结构。建立了基于分子动力学模拟原理的粗粒分子模型，以了解皱纹的形成，并建立 GO 厚度与产生的皱纹波长之间的关系。当 GO 薄膜的厚度增加时，发现电阻降低。所形成的复合膜在10%应变下经历多达1000次拉伸-释放循环后仍能保持稳定的导电性。由于具有可控的电导率，所报道的复合材料可以作为应变传感器提供潜在的应用，其传感范围可调且具有高耐用性。