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Facile Physical Route to Highly Crystalline Graphene

Authors

  • Meihua Jin,

    1. BK21 Physics Divsion, Department of Energy Science, and Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Korea
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  • Tae Hyung Kim,

    1. BK21 Physics Divsion, Department of Energy Science, and Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Korea
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  • Seong Chu Lim,

    1. BK21 Physics Divsion, Department of Energy Science, and Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Korea
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  • Dinh Loc Duong,

    1. BK21 Physics Divsion, Department of Energy Science, and Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Korea
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  • Hyeon Jin Shin,

    1. Graphene Center, Samsung Advanced Institute of Technology (SAIT), P. O. Box 111, Suwon 440-600, Korea
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  • Young Woo Jo,

    1. BK21 Physics Divsion, Department of Energy Science, and Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Korea
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  • Hae Kyung Jeong,

    1. Department of Physics, Daegu University, GyeonSan 712-714, Korea
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  • Jian Chang,

    1. BK21 Physics Divsion, Department of Energy Science, and Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Korea
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  • Sishen Xie,

    1. Department of Energy Science, Sungkyunkwan University, Suwon 440-746, Korea, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
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  • Young Hee Lee

    Corresponding author
    1. BK21 Physics Divsion, Department of Energy Science, and Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Korea
    • BK21 Physics Divsion, Department of Energy Science, and Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Korea.
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Abstract

A physical route is proposed to obtain highly crystalline graphene sheets with minimal oxygen content similar to the precursor graphite. The functional graphene sheets obtained from graphite oxide by low temperature thermal exfoliation are annealed at high temperature (1900 °C) in a vacuum (10−6 torr). The D band intensity in Raman spectroscopy is reduced significantly, while the G band intensity is recovered, similar to the level of precursor graphite. No appreciable oxygen content is observed from X-ray photoelectron spectroscopy and an electrical conductivity of ∼56 500 S m−1 is obtained, comparable to 100 900 S m−1 of the precursor graphite.

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