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Issue 13, 2018
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Characterisation, coverage, and orientation of functionalised graphene using sum-frequency generation spectroscopy

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Abstract

We report the unambiguous detection of phenyl groups covalently attached to functionalised graphene using non-linear spectroscopy. Sum-frequency generation was employed to probe graphene on a gold surface after chemical functionalisation using a benzene diazonium salt. We observe a distinct resonance at 3064 cm−1 which can clearly be assigned to an aromatic C–H stretch by comparison with a self-assembled monolayer on a gold substrate formed from benzenethiol. Not only does sum-frequency generation spectroscopy allow one to characterise functionalised graphene with higher sensitivity and much better specificity than many other spectroscopic techniques, but it also opens up the possibility to assess the coverage of graphene with functional groups, and to determine their orientation relative to the graphene surface.

Graphical abstract: Characterisation, coverage, and orientation of functionalised graphene using sum-frequency generation spectroscopy

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Publication details

The article was received on 28 Nov 2017, accepted on 13 Mar 2018 and first published on 13 Mar 2018


Article type: Paper
DOI: 10.1039/C7CP07991E
Citation: Phys. Chem. Chem. Phys., 2018,20, 8962-8967
  • Open access: Creative Commons BY-NC license
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    Characterisation, coverage, and orientation of functionalised graphene using sum-frequency generation spectroscopy

    H. S. AlSalem, C. Holroyd, M. Danial Iswan, A. B. Horn, M. A. Denecke and S. P. K. Koehler, Phys. Chem. Chem. Phys., 2018, 20, 8962
    DOI: 10.1039/C7CP07991E

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