National Research Lab, for Organic Opto-Electronic Materials, Department of Chemical and Biomolecular Eng. (BK-21), Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
Nat Nanotechnol. 2011 Nov 20;7(1):29-34. doi: 10.1038/nnano.2011.198.
The boundaries between domains in single-layer graphene strongly influence its electronic properties. However, existing approaches for domain visualization, which are based on microscopy and spectroscopy, are only effective for domains that are less than a few micrometres in size. Here, we report a simple method for the visualization of arbitrarily large graphene domains by imaging the birefringence of a graphene surface covered with nematic liquid crystals. The method relies on a correspondence between the orientation of the liquid crystals and that of the underlying graphene, which we use to determine the boundaries of macroscopic domains.
单层石墨烯中畴的边界强烈影响其电子性质。然而，现有的畴可视化方法基于显微镜和光谱学，仅对小于几微米的畴有效。在这里，我们通过对覆盖向列液晶的石墨烯表面的双折射进行成像，报告了一种可视化任意大石墨烯畴的简单方法。该方法依赖于液晶的取向与下面的石墨烯的取向之间的对应关系，我们利用这种对应关系来确定宏观畴的边界。
