e-space
Manchester Metropolitan University's Research Repository

    Evidence for Site-Specific Reversible Hydrogen Adsorption on Graphene by Sum-Frequency Generation Spectroscopy and Density Functional Theory

    AlSalem, Huda, Just-Baringo, Xavier, Larrosa, Igor, Monteverde, Umberto, Jiang, Xingxing, Feng, Yexin and Koehler, Sven PK (2019) Evidence for Site-Specific Reversible Hydrogen Adsorption on Graphene by Sum-Frequency Generation Spectroscopy and Density Functional Theory. The Journal of Physical Chemistry C, 123 (42). pp. 25883-25889. ISSN 1932-7447

    [img]
    Preview
    Accepted Version
    Download (680kB) | Preview

    Abstract

    We have characterized the C−H stretching vibrations of hydrogenated graphene on gold substrates using vibrational sum-frequency generation (SFG) spectroscopy. These C−H stretches are red-shifted as compared to aliphatic C−H stretches, and SFG signal intensities of the C−H vibrational features increase with increasing hydrogen coverage. By comparison with density-functional theory (DFT) calculations, we conclude that hydrogen atoms covalently attach to the graphene lattice from above the graphene sheet; preferential binding motifs are dimers in the ortho and para positions. SFG spectroscopy is hence not only able to detect hydrogen atoms on graphene at sub-monolayer coverage but it can also serve to obtain relative information about the surface coverage, and in combination with DFT can reveal information about binding motifs.

    Impact and Reach

    Statistics

    Activity Overview
    6 month trend
    104Downloads
    6 month trend
    207Hits

    Additional statistics for this dataset are available via IRStats2.

    Altmetric

    Actions (login required)

    View Item View Item