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Atomic Oxygen on Graphite: Chemical Characterization and Thermal Reduction (Articolo in rivista)

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Atomic Oxygen on Graphite: Chemical Characterization and Thermal Reduction (Articolo in rivista) (literal)

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Rosanna Larciprete (1); Paolo Lacovig (2); Sandra Gardonio (2,3); Alessandro Baraldi (4,5); Silvano Lizzit (2) (2012)
Atomic Oxygen on Graphite: Chemical Characterization and Thermal Reduction
in Journal of physical chemistry. C; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
(literal)

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Rosanna Larciprete (1); Paolo Lacovig (2); Sandra Gardonio (2,3); Alessandro Baraldi (4,5); Silvano Lizzit (2) (literal)

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1 CNR-Institute for Complex Systems, via Fosso del Cavaliere 100, I-00133 Roma, Italy 2 Sincrotrone Trieste S.C.p.A., Strada Statale 14 Km 163.5, I-34149 Trieste, Italy 3 University of Nova Gorica, Vipavska 11c, 5270 Ajdovscina, Slovenia 4 Physics Department and CENMAT, University of Trieste, Via Valerio 2, I-34127 Trieste, Italy 5 Laboratorio TASC CNR-IOM, Strada Statale 14 Km 163.5, I-34149 Trieste, Italy (literal)

Titolo

Atomic Oxygen on Graphite: Chemical Characterization and Thermal Reduction (literal)

Abstract

The chemisorption of O atoms on graphite and the thermal reduction of the oxidized surface were studied by means of high energy resolution photoelectron spectroscopy with synchrotron radiation. The C 1s and O 1s core levels and the valence band spectra were used to identify the different oxidizing surface species and to evaluate the extension of the sp2 conjugation as a function of oxidation time and annealing temperature. We found that epoxy groups are the dominant species only at the low oxidation stage, and ethers and semiquinones form as oxidation proceeds. The evolution of the ether/epoxy ratio with increasing oxygen coverage provides evidence for the occurrence of C-C bond unzipping. Epoxy groups are the functionalities with the lowest thermal stability and start to desorb around 370 K, strongly affecting the desorption temperature of other functional groups. The ratio between ethers and epoxy groups determines the balance between epoxy-epoxy and epoxy-ether reactions, the latter promoting the removal of C atoms from the C backbone. Adsorbate spectroscopy during thermal annealing definitely proves the catalytic effect of the basal plane oxygen atoms on the desorption reactions. (literal)

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