A facile approach was developed for producing highly conductive and free-standing graphene/polymer nanocomposite films for flexible radio-frequency (RF) antenna applications. Highly ordered macroporous and three-dimensional (3D) graphene-based nanocomposite films were obtained by growing graphene on Ni foam via chemical vapor deposition, Ni etching, and subsequent polymer infiltration into the graphene foam (GF). The film exhibited a surface resistance of 5 Ω/sq, which was 4,000 times lower than that of the reduced graphene oxide foam/polymer nanocomposite film. The large domain size provides a short electron transport pathway and good compatibility and interfacial adhesion between the GF and polymer matrix, resulting in an extremely flexible and conductive graphene-based film with high reliability. The free-standing GF-based RF antenna has a low return loss (−37.5 dB), as well as a high radiation efficiency (76.7%), making it commercially viable, and maintained its performance even under mechanical deformation over 1,000 bending cycles. The dimensions of the antenna were adjusted by controlling the size of the Ni template to achieve frequency tunability. These results demonstrate the potential of 3D graphene-based antennas for applications in wireless communications for Bluetooth and Wi-Fi technology.

开发了一种简便的方法来生产用于柔性射频 (RF) 天线应用的高导电性和独立式石墨烯/聚合物纳米复合薄膜。高度有序的大孔和三维 (3D) 石墨烯基纳米复合薄膜是通过化学气相沉积、Ni 蚀刻和随后的聚合物渗入石墨烯泡沫 (GF) 在 Ni 泡沫上生长石墨烯获得的。该薄膜的表面电阻为 5 Ω/sq，比还原氧化石墨烯泡沫/聚合物纳米复合薄膜的表面电阻低 4,000 倍。大畴尺寸提供了较短的电子传输路径以及GF和聚合物基体之间良好的相容性和界面粘附性，从而产生了具有高可靠性的极其柔韧和导电的石墨烯基薄膜。基于 GF 的独立式射频天线具有低回波损耗 (-37.5 dB) 和高辐射效率 (76.7%)，使其在商业上可行，即使在超过 1,000 次弯曲循环的机械变形下也能保持其性能。通过控制Ni模板的尺寸来调整天线的尺寸，以实现频率可调。这些结果证明了基于 3D 石墨烯的天线在蓝牙和 Wi-Fi 技术的无线通信应用中的潜力。