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


Image of FIG. 1.
FIG. 1.

(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).

Image of FIG. 2.
FIG. 2.

(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.

Image of FIG. 3.
FIG. 3.

(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)

Image of FIG. 4.
FIG. 4.

(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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Temperature induced transition from hexagonal to circular pits in graphite oxidation by O2