Weak mismatch epitaxy and structural Feedback in graphene growth on copper foil
Weak mismatch epitaxy and structural Feedback in graphene growth on copper foil
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DOI：
10.1007/s12274-013-0285-y
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发表时间：
2013-01
期刊：
影响因子：
9.9
通讯作者：
N. Wilson;A. J. Marsden;Mohammed Saghir;Catherine J. Bromley;R. Schaub;G. Costantini;Thomas W. White-Thomas-W.-Wh
中科院分区：
文献类型：
--
作者：
N. Wilson;A. J. Marsden;Mohammed Saghir;Catherine J. Bromley;R. Schaub;G. Costantini;Thomas W. White-Thomas-W.-Wh
通过低压化学气相沉积在低成本铜箔上生长石墨烯显示出大规模应用的巨大前景。众所周知，箔的局部晶体学影响石墨烯的生长速率。在这里，我们发现了石墨烯和铜箔之间的外延关系。石墨烯和铜之间的界面重组推动了在主要为 Cu(100) 的表面上形成 (n10) 面，而这些面反过来又影响石墨烯从生长开始的方向。角分辨光电发射表明石墨烯的电子结构与铜解耦，表明它们之间的相互作用很弱。尽管如此，还是发现了石墨烯的两个优选取向，距Cu[010]方向±8°，产生了石墨烯晶界取向差角的不均匀分布。与单晶 Cu(110) 上石墨烯生长的模型系统的比较表明，这种取向排列是由于失配外延所致。尽管对称性存在差异，但石墨烯的方向由铜的方向决定。我们预计这些观察结果不仅对于控制和理解铜上石墨烯的生长过程具有重要意义，而且对于低成本金属基底上的二维材料的生长也具有更广泛的影响。
Graphene growth by low-pressure chemical vapor deposition on low cost copper foils shows great promise for large scale applications. It is known that the local crystallography of the foil influences the graphene growth rate. Here we find an epitaxial relationship between graphene and copper foil. Interfacial restructuring between graphene and copper drives the formation of (n10) facets on what is otherwise a mostly Cu(100) surface, and the facets in turn influence the graphene orientations from the onset of growth. Angle resolved photoemission shows that the electronic structure of the graphene is decoupled from the copper indicating a weak interaction between them. Despite this, two preferred orientations of graphene are found, ±8° from the Cu[010] direction, creating a non-uniform distribution of graphene grain boundary misorientation angles. Comparison with the model system of graphene growth on single crystal Cu(110) indicates that this orientational alignment is due to mismatch epitaxy. Despite the differences in symmetry the orientation of the graphene is defined by that of the copper. We expect these observations to not only have importance for controlling and understanding the growth process for graphene on copper, but also to have wider implications for the growth of two-dimensional materials on low cost metal substrates.