Hexagonal Single Crystal Domains of Few-Layer Graphene on Copper Foils
Hexagonal Single Crystal Domains of Few-Layer Graphene on Copper Foils
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DOI：
10.1021/nl104142k
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发表时间：
2011-03-01
期刊：
影响因子：
10.8
通讯作者：
Warner, Jamie H.
中科院分区：
文献类型：
--
作者：
Robertson, Alex W.;Warner, Jamie H.
采用大气压化学气相沉积法，在高甲烷流量下，在铜箔上合成了具有障碍物形状的单层石墨烯单晶畴。扫描电子显微镜显示，石墨烯域具有六边形形状，并在铜箔上随机取向。然而，石墨烯成核的位点通过形成线性行而表现出一些相关性。透射电子显微镜用于检查各个域的折叠边缘，并揭示它们是由中心区域中的大约5-10层组成的少层石墨烯，并且朝向域的边缘变薄。个别孤立域的选区电子衍射表明，它们是具有AB Bernal堆垛的单晶，并且不含与乱层石墨相关的固有旋转堆垛层错。我们研究了随时间变化的增长动力学的域，并表明，最终的连续FLG膜是多晶的，随机连接的单晶域组成。
Hexagonal-shaped single crystal domains of few layer graphene (FLG) are synthesized on copper foils using atmospheric pressure chemical vapor deposition with a high methane flow. Scanning electron microscopy reveals that the graphene domains have a hexagonal shape and are randomly orientated on the copper foil. However, the sites of graphene nucleation exhibit some correlation by forming linear rows. Transmission electron microscopy is used to examine the folded edges of individual domains and reveals they are few-layer graphene consisting of approximately 5-10 layers in the central region and thinning out toward the edges of the domain. Selected area electron diffraction of individual isolated domains reveals they are single crystals with AB Bernal stacking and free from the intrinsic rotational stacking faults that are associated with turbostratic graphite. We study the time-dependent growth dynamics of the domains and show that the final continuous FLG film is polycrystalline, consisting of randomly connected single crystal domains.