Functional groups at carbon surfaces

AFM of HCl treated HOPG before and after heating in air.

AFM of HCl treated HOPG before and after heating in air.

Our latest paper on the nature and role of functional groups on highly ordered pyrolytic graphite (HOPG) surfaces in the stabilisation of gold nanoparticles has been accepted for publication in Faraday Discussion 173. The uncorrected proofs are available here. We have used selective functionalisation and XPS to identify the functional groups produced on the HOPG by acids and study how these are affected by heating. HCl produce primarily OH(a) which when heated convert to a mixture of ketone and ether type oxygens. We show the effect of these oxygen states on gold deposited on the surface from solution. The figure shown here is an AFM of the effect of heating on the functionalised HOPG surface.

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