Dispersions of graphene sheets characterized by Raman spectroscopy

ORAL

Abstract

Using expertise garnered on carbon nanotube separation, work is underway to demonstrate quality graphene dispersions and low defect sheets in the liquid phase. Several combinations of surfactants, solutions, starting graphite material, and separation protocols are being explored to determine the optimal chemical and physical environments. Raman spectroscopy is used as the quality indicator both for the numbers of layers and the defect density. Additional characterization with AFM and UV-Vis confirms our findings.

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Authors

  • Ming Zheng

    National Institute of Standards and Technology, NIST

  • Angela Hight Walker

    NIST, National Institute of Standards and Technology

  • Irene Calizo

    NIST, National Institute of Standards and Technology

  • Guangjun Cheng

    NIST

  • Xiaomin Tu

    NIST

  • Jeff Simpson

    Towson University