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(Color online) Snapshots taken from in-situ SEM observation of HOPG oxidation under a pure O 2 atmosphere at an operating pressure of 140 Pa at 1018 K (a) and 1053 K (b). (c)-(f): zooms on hexagonal (c) and (d) and circular (e) and (f) pits; (g) and (h): model pits obtained from KMC simulations at 1000 K (g) and 1075 K (h).
(Color online) Arrhenius plot of the linear growth rate of oxidation (140 Pa of pure O 2) pits in HOPG showing a transition from hexagonal to circular holes. Error bars shown on the experimental rates are taken as twice the standard deviation of the rates measured on different pits (from 15 to 30) of the same sample.
(Color online) Tapping mode atomic force microscopy imaging of HOPG samples oxidized at 987 K (a) and 1037 K (b) (140 Pa of pure O 2)
(Color online) Three-dimensional kinetic Monte Carlo oxidation model. Typical pit morphologies are displayed as a function of the armchairetching (P AC ) and in-depth pitting (P P ) normalized probabilities (P AC + P ZZ + P P = 1).
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