Role of the Near-Surface Region of a Substrate in a Two-Dimensional Phase Transition Leading to the Growth of Single-Layer Graphene: The Pt–C System
| Autor: | N. R. Gall, E. V. Rut’kov |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | JETP Letters. 113:576-580 |
| ISSN: | 1090-6487 0021-3640 |
| DOI: | 10.1134/s0021364021090095 |
| Popis: | A new approach to the growth and destruction of graphene owing to a two-dimensional first-order condensation phase transition on metals dissolving carbon has been proposed and experimentally tested. It has been shown that this process cannot be correctly described taking into account only intrinsic surface phases: graphene and chemisorbed carbon, as previously proposed for iridium, which is the only metal that does not dissolve С atoms in the bulk. However, the description becomes correct if both carbon atoms on the surface and carbon atoms that are dissolved in the bulk of the metal and are in equilibrium with surface carbon are taken into consideration. A strong correlation between the critical concentrations of carbon on the surface Ns, cr and in the bulk Nb, cr in the phase transition with the formation of graphene islands has been demonstrated by example of the graphene–Pt(111) system. The temperature dependences of Ns, cr and Nb, cr have been determined for the first time in a wide temperature range; in particular, Ns, cr = 3.0 × 1013 cm–2 and Nb, cr = 3.5 × 1019 cm–3 at $$T = 1770$$ K. |
| Databáze: | OpenAIRE |
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