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We report on the synthesis of hollow tin dioxide nanoislands by molecular-beam deposition of Sn on Si∕SiO2 substrates followed by thermal oxidation. Their microstructure and phase composition were studied by transmission electron microscopy. The appearance of small (2–5nm) initial voids and their evolution into large (10–30nm) holes in the SnO2 nanoislands correlates with the temperature of oxidation and content of oxygen in the atmosphere. This correlation is discussed on the basis of the Kirkendall effect with the additional assumption that absorption of oxygen atoms on the oxide surface creates an electric field that promotes the diffusion of metal ions.
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Гайдук et al. (2008) studied this question.
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