Abstract Flexible strain sensors made by conductive elastomer composites have attracted increasing attention. In this paper, the electromechanical properties of graphene-silicone rubber nanocomposites are studied systematically. First, the conductive nanocomposites composed of graphene and silicone rubber are prepared by means of co-coagulation, which shows a lower percolation threshold with 1.87 wt% (0.94 vol%). Second, the rubber nanocomposites with different graphene contents exhibit a very high strain sensitivity (gauge factor > 143) and a larger strain sensing range (>170%), also, the good recoverability and reproducibility have been found during the loading-unloading cycle. Finally, the analytical model based on the connectivity of the graphene nanosheets and the viscoelasticity of the rubber matrix is developed to describe the electromechanical properties and explain the ‘shoulder peak’ phenomenon, also a typical application example about monitoring the operate state of the rubber seal is given.

中文翻译：

---

用于应变传感的高灵敏度和可拉伸石墨烯-硅橡胶复合材料

摘要 由导电弹性体复合材料制成的柔性应变传感器受到越来越多的关注。本文系统地研究了石墨烯-硅橡胶纳米复合材料的机电性能。首先，由石墨烯和硅橡胶组成的导电纳米复合材料通过共凝制备，其渗透阈值较低，为 1.87 wt% (0.94 vol%)。其次，具有不同石墨烯含量的橡胶纳米复合材料表现出非常高的应变敏感性（应变系数> 143）和更大的应变传感范围（> 170％），并且在加载-卸载循环中发现了良好的可恢复性和再现性。最后，