Graphene is most often prepared by thermally reducing graphite oxide. But the resulting graphene often has defects, which could be due to gaseous organic byproducts, this article says. "It has been commonly believed that the only gaseous products of graphite oxide exfoliation are water, carbon monoxide and carbon dioxide. But this belief was based on only a few studies which never looked for anything more complex," said Martin Pumera of Nanyang Technological University in Singapore.

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