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A simple and effective stepwise-method has been developed to remove defectsfrom the top graphene layers of highly orientated pyrolytic graphite. Using acombination of ozone exposure and moderately high temperature we have shownthat a defect-rich graphite surface can be modified to generate a graphene-likesurface containing a negligible amount of oxygen, hydrogen and sp3 carbon. Wereport definitive x-ray photoelectron and x-ray absorption spectroscopyanalysis after each stage of the process, suggest a mechanism by which themodification occurs and propose it as a route towards the preparation ormanipulation of pristine graphene samples.

A simple method to produce almost perfect graphene on highly oriented pyrolytic graphite