Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 15, Issue 45, Pages 19625-19631Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp53802h
Keywords
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Funding
- German Research Council (DFG)
- Fonds der chemischen Industrie
- China Scholarship Council
- [SFB 953]
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The growth and oxidation of graphene supported on Rh(111) was studied in situ by high-resolution X-ray photoelectron spectroscopy. By variation of propene pressure and surface temperature the optimum growth conditions were identified, yielding graphene with low defect density. Oxidation of graphene was studied at temperatures between 600 and 1000 K, at an oxygen pressure of similar to 2 x 10(-6) mbar. The oxidation follows sigmoidal reaction kinetics. In the beginning, the reaction rate is limited by the number of defects, which represent the active sites for oxygen dissociation. After an induction period, the reaction rate increases and graphene is rapidly removed from the surface by oxidation. For graphene with a high defect density we found that the oxidation is faster. In general, a reduction of the induction period and a faster oxidation occur at higher temperatures.
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