The boundaries between domains in single-layer graphene1-4 strongly influence its electronic properties5-12. However, existing approaches for domain visualization, which are based on microscopy and spectroscopy2,12-16, 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 crystal and that of the underlying graphene, which we use to determine the boundaries of macroscopic domains.
Bibliographical noteFunding Information:
This work was supported by the National Research Laboratory Program (R0A-2007-000-20037-0, NRF), World Class University Program (R32-2008-000-10142-0, NRF), and the Global Frontier Research Center for Advanced Soft Electronics. The authors especially appreciate helpful discussions with Prof. Mohan Srinivasarao.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Biomedical Engineering
- Materials Science(all)
- Condensed Matter Physics
- Electrical and Electronic Engineering