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An undercover agent: graphene has been used as an imaging agent to visualize interfacial reactions under its cover, and exhibits a strong confinement effect on the chemistry of molecules underneath. In a CO atmosphere, CO penetrates into the graphene/Pt(111) interface and reacts with O(2) therein, whereas intercalated CO desorbs from the Pt surface.
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Mu et al. (2012) studied this question.
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