State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, PR China.
Nanoscale. 2013 Jun 21;5(12):5456-61. doi: 10.1039/c3nr00963g.
In this paper, we systematically studied the effects of coronene as nucleation seeds for graphene synthesis at low temperatures by chemical vapor deposition. Naphthalene was used as a solid carbon source which is capable of producing graphene at temperatures down to 300 °C. The experimental results showed clear evidence that coronene seeds work as preferred nucleation sites, through which the nucleation density and graphene domain size could be modulated. The introduction of the seeds greatly improved the homogeneity of monolayer graphene by suppressing uncontrolled nucleation and multilayer growth of graphene domains. The obtained carrier mobility of graphene fabricated at 400 °C by the seed-assisted process reached ~912 cm(2) V(-1) s(-1), which is considerably higher than that of ~300 cm(2) V(-1) s(-1) measured on graphene prepared without seeding. Besides offering cost advantages for large scale application, the technique proposed in this study may find significant applications in graphene/copper hybrid interconnects and graphene based flexible electronics.
在本文中，我们系统地研究了 coronene 作为低温化学气相沉积法合成石墨烯的成核种子的效果。萘被用作固体碳源，它能够在低至 300°C 的温度下生成石墨烯。实验结果表明，coronene 种子是作为优先成核点起作用的，通过控制成核密度和石墨烯畴尺寸，可以对其进行调节。通过抑制石墨烯畴的无控制成核和多层生长，引入种子大大提高了单层石墨烯的均匀性。通过种子辅助工艺在 400°C 下制备的石墨烯的获得载流子迁移率达到约 912 cm(2) V(-1) s(-1)，比未采用种子的情况下制备的石墨烯的约 300 cm(2) V(-1) s(-1)高得多。除了为大规模应用提供成本优势外，本研究提出的技术可能在石墨烯/铜混合互连和基于石墨烯的柔性电子学中得到广泛应用。
