title: Growth and oxidation of graphene on Rh(111).
abstract: 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 ~2 × 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.
authors.affiliation: Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany. christian.papp@fau.de.
authors.forename: Karin
authors.initials: K
authors.lastname: Gotterbarm
authors.forename: Wei
authors.initials: W
authors.lastname: Zhao
authors.forename: Oliver
authors.initials: O
authors.lastname: Höfert
authors.forename: Christoph
authors.initials: C
authors.lastname: Gleichweit
authors.forename: Christian
authors.initials: C
authors.lastname: Papp
authors.forename: Hans-Peter
authors.initials: HP
authors.lastname: Steinrück