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Article Dans Une Revue Applied Physics Letters Année : 2011

Temperature induced transition from hexagonal to circular pits in graphite oxidation by O2

Résumé

We report on an in-situ monitoring of graphite oxidation using a high temperature environmental scanning electron microscope. A morphological transition is clearly identified around 1040 K between hexagonal pits at low temperatures and circular pits at high temperatures, with apparently no change in the kinetic law. A kinetic Monte Carlo model allows rationalizing these findings in terms of the competitive oxidation of armchair and zig-zag edge sites and provides an estimate of the rate laws associated to these two events. Extended to three dimensions, the model also explains the "in-depth" transition between the stepwise hexagons and the hemispheres observed by atomic force microscopy.
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hal-00618148 , version 1 (11-09-2023)

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Arnaud Delehouzé, Francis Rebillat, Patrick Weisbecker, Jean-Marc Leyssale, Jean-François Epherre, et al.. Temperature induced transition from hexagonal to circular pits in graphite oxidation by O2. Applied Physics Letters, 2011, 99 (4), 044102 (3 p.). ⟨10.1063/1.3615801⟩. ⟨hal-00618148⟩
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