dr. Gregor Bavdek: Electronic Properties of Graphene Synthesized on Catalytic Metal Surface
Povzetek:
Electronic Properties of Graphene Synthesized on Catalytic Metal Surface
dr. Gregor Bavdek
Faculty of Education, University of Ljubljana
and
TASC Laboratory at CNR-IOM, Trieste
Graphene has been extensively studied in the past 10 years due to its electronic properties, e.g. very high charge carrier mobilities, which open its way to fast carbon-based electronics.
Catalytic decomposition of light gasseos hydrocarbons on metallic surfaces in ultrahigh vacuum is one of the effective methods for large-area graphene synthesis. Among several catalytically active metals Ni(111) surface is of particular interest: it allows graphene to grow at relatively low temperatures and due to its high carbon solubility it enables segregation growth. On Ni(111) several electronically inequivalent graphene phases can be grown, depending on the substrate temperature and surface carbon concentration. The formation of graphene phases as well as graphene removal by ion sputtering has been monitored by combining He-atom scattering and photoemission spectroscopy. Graphene phases have been characterized by X-ray photoemission spectroscope (XPS) and angle resolved UV photoemission spectroscopy (ARUPS) to reveal the role of graphene-Ni coupling on the graphene band structure.
Combined with STM images the graphene/Ni layers will be presented as a tunable template for further architectures with organic based nanoassemblies. The impact of graphene-Ni coupling strength on the organic-graphene interfacial charge transport will be discussed.
