Early stage of CVD graphene synthesis on Ge(001) substrate
In: Carbon, Jg. 134 (2018-08-01), S. 183-188
Online
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Zugriff:
In this work we shed light on the early stage of the chemical vapor deposition of graphene on Ge(001) surfaces. By a combined use of m-Raman and x-ray photoelectron spectroscopies, and scanning tunneling microscopy and spectroscopy, we were able to individuate a carbon precursor phase to graphene nucleation which coexists with small graphene domains. This precursor phase is made of C aggregates with different size, shape and local ordering which are not fully sp(2) hybridized. In some atomic size regions these aggregates show a linear arrangement of atoms as well as the first signature of the hexagonal structure of graphene. The carbon precursor phase evolves in graphene domains through an ordering process, associated to a re-arrangement of the Ge surface morphology. This surface structuring represents the embryo stage of the hills-and-valleys faceting featured by the Ge(001) surface for longer deposition times, when the graphene domains coalesce to form a single layer graphene film. (C) 2018 Elsevier Ltd. All rights reserved.
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Early stage of CVD graphene synthesis on Ge(001) substrate
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Autor/in / Beteiligte Person: | Fazi, Laura ; Miseikis, Vaidotas ; Sgarlata, Anna ; Coletti, Chiara ; M. De Seta ; Notargiacomo, Andrea ; L. Di Gaspare ; Scaparro, A. M. ; Fanfoni, Massimo ; Di Gaspare, L. ; Fanfoni, M. ; Fazi, L. ; Sgarlata, A. ; Notargiacomo, A. ; Miseikis, V. ; De Seta, M. |
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Zeitschrift: | Carbon, Jg. 134 (2018-08-01), S. 183-188 |
Veröffentlichung: | Elsevier BV, 2018 |
Medientyp: | unknown |
ISSN: | 0008-6223 (print) |
DOI: | 10.1016/j.carbon.2018.03.092 |
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