In recent years, the use of nano-fillers in flexible polymer matrix to prepare highly flexible, stretchable, and multifunctional product has been widely studied. However, the uneven dispersion of nano-fillers in polymer matrix is an important factor hindering their performance. In this study, a method to prepare graphene nanosheets by ball milling and modification with the silane coupling agent APTES is reported, and this method can reduce the thickness of the nanosheets, improving the dispersion effect and compatibility of the nanosheets in the PDMS matrix. The mechanical and conductive properties of the prepared composite films were further analyzed. The morphology showed that our modified graphene (MGE and BMGE) are more evenly dispersed in the PDMS matrix compared to the unmodified graphene (GNP). The MGE/PDMS composite film has significantly improved electrical conductivity. It has a wide sensing range (up to 48%), high sensitivity (GF of 152 in the 20%–40% strain range) and reliable cycle repeatability (>10,000 cycles) with a response time of 0.12 s. The results show that the modified graphene/PDMS conductive elastic nanocomposite film is an ideal material for making flexible electronic products.

中文翻译：

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包含各种石墨烯纳米片及其衍生物的耐用、高灵敏度导电弹性体纳米复合膜

近年来，利用纳米填料在柔性聚合物基体中制备高柔性、可拉伸、多功能的产品得到了广泛的研究。然而，纳米填料在聚合物基体中的分散不均匀是阻碍其性能的重要因素。本研究报道了一种通过球磨和硅烷偶联剂APTES改性制备石墨烯纳米片的方法，该方法可以降低纳米片的厚度，提高纳米片在PDMS基体中的分散效果和相容性。进一步分析了制备的复合薄膜的机械和导电性能。形态表明，与未改性石墨烯 (GNP) 相比，我们的改性石墨烯（MGE 和 BMGE）更均匀地分散在 PDMS 基质中。MGE/PDMS复合薄膜的导电性显着提高。它具有宽传感范围（高达 48%）、高灵敏度（在 20%–40% 应变范围内 GF 为 152）和可靠的循环可重复性（>10,000 次循环），响应时间为 0.12 秒。结果表明，改性石墨烯/PDMS导电弹性纳米复合薄膜是制作柔性电子产品的理想材料。