Abstract Cu/graphene/Cu sandwiched nanofilms with a thickness of ~100 nm were prepared on SiO2/Si substrates by a combined process of magnetron sputtering and graphene transfer. Except for an enhancement of 14.9% on hardness as compared to Cu/Cu nanofilms, the as-sputtered and annealed sandwiched nanofilms show improvements on electrical conductivity by 18.0% and 17.2%, respectively. By using Raman spectroscopy, the enhancement mechanism on electrical conductivity was investigated with respect to electron doping, and strain effect on the band gap of graphene and thus the doping concentration was also discussed.

中文翻译：

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同时增强Cu/石墨烯/Cu夹层纳米膜的导电性和强度

摘要 采用磁控溅射和石墨烯转移相结合的工艺，在SiO2/Si 衬底上制备了厚度为~100 nm 的Cu/石墨烯/Cu 夹层纳米薄膜。除了与 Cu/Cu 纳米膜相比硬度提高 14.9% 外，溅射和退火的夹心纳米膜的电导率分别提高了 18.0% 和 17.2%。通过使用拉曼光谱，研究了电子掺杂对电导率的增强机制，并讨论了对石墨烯带隙的应变效应，进而讨论了掺杂浓度。