Solid-source growth and atomic-scale characterization of graphene on Ag(111)
Solid-source growth and atomic-scale characterization of graphene on Ag(111)
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DOI：
10.1038/ncomms3804
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发表时间：
2013-11-01
影响因子：
16.6
通讯作者：
Guisinger, Nathan P.
中科院分区：
文献类型：
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作者：
Kiraly, Brian;Iski, Erin V.;Guisinger, Nathan P.
银是石墨烯生长的理想平台，因为混合石墨烯等离子体的潜力以及它作为其他二维材料（如硅烯）的首选生长基质的新兴作用。在这里，我们展示了单层石墨烯在单晶Ag（111）衬底上的直接生长。Ag的惰性性质使得使用标准的化学气相沉积技术合成石墨烯变得困难，我们已经通过使用元素碳源克服了这一困难。原子尺度扫描隧道显微镜显示，原子清洁的石墨烯-银衬底没有有机残留物和其他污染物。枝状石墨烯具有多种边缘端点，其中许多端点会产生以前只在绝缘衬底上看到的量子干涉。这种散射支持了石墨烯电子结构被底层银扰动最小的光谱证据，提供了一种石墨烯与其生长衬底解耦的新系统。
Silver is a desirable platform for graphene growth because of the potential for hybrid graphene plasmonics and its emerging role as a preferred growth substrate for other two-dimensional materials, such as silicene. Here we demonstrate the direct growth of monolayer graphene on a single-crystal Ag(111) substrate. The inert nature of Ag has made it difficult to use for graphene synthesis using standard chemical vapour deposition techniques, which we have overcome by using an elemental carbon source. Atomic-scale scanning tunnelling microscopy reveals that the atomically clean graphene-silver substrate is free of organic residue and other contaminants. The dendritic graphene possesses a variety of edge terminations, many of which give rise to quantum interferences previously seen only on insulating substrates. This scattering supports spectroscopic evidence that the graphene electronic structure is minimally perturbed by the underlying silver, providing a new system in which graphene is decoupled from its growth substrate.