Stretchable and flexible graphite films can be effectively applied as functional layers in the progressively increasing field of stretchable and flexible electronics. In this paper, we focus on the feasibility of making stretchable and flexible films based on expanded graphite particles on a polymeric substrate material, polydimethylsiloxane (PDMS). The expanded graphite particles used in this work are prepared by utilizing bath sonication processes at the ultrasonic frequency of either the commercially available graphite flakes or graphite particles obtained through electrolysis under the interstitial substitution of silver and sulfate, respectively. The X-ray diffraction (XRD) patterns confirm that, due to the action of the bath sonication intercalation of graphite taking place, the resistances of the as-fabricated thin films is ultimately lowered. Mechanical characterizations, such as stretchability, flexibility and reliability tests were performed using home-made tools. The films were found to remain stretchable up to 40% tensile strain and 20% bending strain. These films were also found to remain functional when repeatedly flexed up to 1000 times.

中文翻译：

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基于膨胀石墨颗粒的可拉伸柔性薄膜

可拉伸的和柔性的石墨膜可以有效地用作可伸缩的和柔性的电子器件领域中逐渐增加的功能层。在本文中，我们将重点放在在聚合物基材聚二甲基硅氧烷（PDMS）上基于膨胀石墨颗粒制作可拉伸和柔性薄膜的可行性上。用于这项工作的膨胀石墨颗粒是通过利用超声波在市场上可买到的石墨薄片或通过在银和硫酸盐的间隙置换下通过电解获得的石墨颗粒的超声频率进行超声处理而制备的。X射线衍射（XRD）图证实，由于浴的超声声波作用，石墨发生了嵌入，最终降低了所制造薄膜的电阻。机械特性如拉伸性，柔韧性和可靠性测试是使用自制工具进行的。发现该膜在高达40％的拉伸应变和20％的弯曲应变下仍保持可拉伸。还发现这些薄膜在反复弯曲多达1000次后仍能保持功能。