Detection of graphene domains and defects using liquid crystals

Jong-Ho Son, Seung-Jae Baeck, Min-Ho Park, Jae-Bok Lee, Cheol-Woong Yang, Jang-Kun Song, Wang-Cheol Zin and Jong-Hyun Ahn ()
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Jong-Ho Son: Pohang University of Science and Technology
Seung-Jae Baeck: School of Electrical & Electronic Engineering, Yonsei University
Min-Ho Park: School of Advanced Materials Science and Engineering, Sungkyunkwan University
Jae-Bok Lee: School of Electrical & Electronic Engineering, Yonsei University
Cheol-Woong Yang: School of Advanced Materials Science and Engineering, Sungkyunkwan University
Jang-Kun Song: School of Electronics & Electrical Engineering, Sungkyunkwan University
Wang-Cheol Zin: Pohang University of Science and Technology
Jong-Hyun Ahn: School of Electrical & Electronic Engineering, Yonsei University

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract The direct observation of the domain size and defect distribution in a graphene film is important for the development of electronic applications involving graphene. Here we report a promising method for observing graphene domains grown by chemical vapour deposition. The unavoidable development of crack or pinhole defects during the growth and transfer processes is visualized using a liquid crystal layer. Liquid crystal molecules align anisotropically with respect to the graphene domains and exhibit distinct birefringence properties that can be used to image the graphene domains. This approach is useful for visualizing the crack distributions and their generation process in graphene films under external strain. This type of simple observation method provides an effective route to evaluating the quality and reliability of graphene sheets for use in various electronic devices.

Date: 2014
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DOI: 10.1038/ncomms4484

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