Instituto Ciencia de Materiales de Madrid-CSIC, c/. Sor Juana Inés de la Cruz, 3, 28049-Madrid, Spain.
ACS Nano. 2011 Jul 26;5(7):5627-34. doi: 10.1021/nn201200j. Epub 2011 Jun 23.
STM images of multidomain epitaxial graphene on Pt(111) have been combined with a geometrical model to investigate the origin of the coincidence Moiré superstructures. We show that there is a relation between the appearance of a particular Moiré periodicity and the minimization of the absolute value of the strain between the graphene and the substrate for the different orientations between both atomic lattices. This model predicts all the stable epitaxial graphene structures that can be grown on transition metal surfaces, and we have made use of it for reproducing previously published data from different authors. Its validity suggests that minimization of the strain within the coincident graphene unit-cell due to a strong local interaction is the driving force in the formation of Moiré superstructures.
我们结合 STM 图像和几何模型研究了多畴外延石墨烯在 Pt(111)上的形成机制，以解释莫尔超晶格的起源。我们发现，对于不同的原子晶格取向，莫尔周期性的出现与石墨烯和衬底之间的应变的绝对值的最小化之间存在关系。该模型预测了可以在过渡金属表面生长的所有稳定的外延石墨烯结构，并且我们已经利用它重现了来自不同作者的先前发表的数据。该模型的有效性表明，由于强局部相互作用导致的在一致的石墨烯单元内应变的最小化是形成莫尔超晶格的驱动力。
