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TT: Fachverband Tiefe Temperaturen
TT 85: Graphene: Adsorption, Intercalation and Other Aspects (joint session DY, DS, HL, MA, O, TT, organized by O)
TT 85.6: Vortrag
Freitag, 24. März 2017, 11:45–12:00, TRE Ma
Oxygen intercalation at the graphene/Ni(111) interface — •Luca Bignardi1, Paolo Lacovig1, Matteo Dalmiglio1, Fabrizio Orlando1,2, Aliakbar Ghafari1,3, Luca Petaccia1, Alessandro Baraldi1,4, Rosanna Larciprete5, and Silvano Lizzit1 — 1Elettra - Sincrotrone Trieste, Trieste, Italy — 2Paul Scherrer Institut - Villingen PSI, Switzerland — 3Helmholtz-Zentrum Berlin, Berlin, Germany — 4Università degli Studi di Trieste, Trieste, Italy — 5CNR - Istituto dei Sistemi Complessi, Rome, Italy
Intercalation of atomic species at the graphene-substrate interface is an effective way to decouple graphene (GR) from the metal on which it is grown, restoring the Dirac cone and tuning the GR-substrate interaction. The intercalation of oxygen was found to be successful, independently of the extent of the graphene-metal interaction, upon a suitable choice of oxygen partial pressure and sample temperature. Herein we report on the intercalation and de-intercalation of oxygen at the strongly interacting Gr/Ni(111) interface. Synchrotron-radiation based high-resolution X-ray photoelectron spectroscopy was used to characterise the intercalation mechanism and the nature of the compounds at the interface. We observed that the intercalated oxygen efficiently decouples the GR layer quenching the hybridisation with the metal substrate. Angle-resolved photoelectron spectroscopy measurements showed the restoration of the Dirac cone band-structure. Moreover, X-ray photoelectron diffraction added further insight into the structure of GR in the different phases of the process.