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The migration of individual Au and Pt atoms in graphene layers (see image) is observed by high-resolution TEM. In situ experiments at 600–700 °C show that two-dimensional diffusion within the plane of the layer and the one-dimensional diffusion along the open edges occurs with activation energies of 2.3–2.5 eV. It is shown that metal atoms strongly interact with carbon in graphene.
Gan et al. (Wed,) studied this question.