Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Science, College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, P. R. China.
Beijing Graphene Institute, 100095, Beijing, P. R. China.
Nat Commun. 2023 Jun 2;14(1):3199. doi: 10.1038/s41467-023-38877-9.
Bilayer graphene (BLG) is intriguing for its unique properties and potential applications in electronics, photonics, and mechanics. However, the chemical vapor deposition synthesis of large-area high-quality bilayer graphene on Cu is suffering from a low growth rate and limited bilayer coverage. Herein, we demonstrate the fast synthesis of meter-sized bilayer graphene film on commercial polycrystalline Cu foils by introducing trace CO during high-temperature growth. Continuous bilayer graphene with a high ratio of AB-stacking structure can be obtained within 20 min, which exhibits enhanced mechanical strength, uniform transmittance, and low sheet resistance in large area. Moreover, 96 and 100% AB-stacking structures were achieved in bilayer graphene grown on single-crystal Cu(111) foil and ultraflat single-crystal Cu(111)/sapphire substrates, respectively. The AB-stacking bilayer graphene exhibits tunable bandgap and performs well in photodetection. This work provides important insights into the growth mechanism and the mass production of large-area high-quality BLG on Cu.
双层石墨烯（BLG）具有独特的性质，在电子学、光子学和力学领域具有潜在的应用前景。然而，在 Cu 上通过化学气相沉积法合成大面积高质量的双层石墨烯的生长速率较低，双层覆盖率有限。在此，我们通过在高温生长过程中引入痕量 CO，在商业多晶 Cu 箔上快速合成了米级大面积双层石墨烯薄膜。在 20 min 内即可获得具有高 AB 堆积结构比的连续双层石墨烯，其在大面积范围内表现出增强的机械强度、均匀的透过率和低的方阻。此外，在单晶 Cu(111)箔和超平整单晶 Cu(111)/蓝宝石衬底上生长的双层石墨烯中，分别实现了 96%和 100%的 AB 堆叠结构。AB 堆叠双层石墨烯具有可调带隙，在光电检测中性能良好。这项工作为在 Cu 上生长大面积高质量 BLG 的生长机制和大规模生产提供了重要的见解。
