Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: Metal Substrates II: Adsorption and Reactivity
O 15.9: Vortrag
Montag, 1. April 2019, 17:00–17:15, Kunsthalle
The role of the surface in the atomic oxidation of supported Coronene films — Jürgen Weippert, Vincent Gewiese, Seyithan Ulas, Dmitry Strelnikov, •Artur Böttcher, and Manfred M. Kappes — Institute of Physical Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 2, 76131 Karlsruhe, Germany
Atomic oxidation of Coronene films grown on HOPG results in the formation of various surface species, CmHnOk, which subsequently can be desorbed as intact nm-sized graphene oxides, nano-GOs. Coronene films were grown at room temperature by low-energy cluster ion beam deposition (LECBD, C24H12+) and oxidized by exposing them to a beam of near-thermal atomic oxygen. The XPS-based analysis indicated that the oxidation of the C24H12 films proceeds predominantly via the formation of epoxides, ethers, and quinones. The mass spectrometric analysis of the subliming species revealed a strong dependency on the film thickness. The sublimation of thick oxidized Coronene films proceeds predominantly via the emission of rim-epoxides C24H12On (n≤ 7) [1]. The sublimation from oxidized thin films, Θ≤ 2, exhibits lactones C23H10O2 and dilactones C22H8O4. The sublimation from Coronene monolayers deposited on a pre-oxidized basal plane is also dominated by the aforementioned oxides.
[1] J. Weippert, et al. JPC C 2018, DOI: 10.1021/acs.jpcc.8b01655