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Early stage of CVD graphene synthesis on Ge(001) substrate
- Source :
- Carbon 134 (2018): 183–188. doi:10.1016/j.carbon.2018.03.092, info:cnr-pdr/source/autori:Di Gaspare, L.; Scaparro, A. M.; Fanfoni, M.; Fazi, L.; Sgarlata, A.; Notargiacomo, A.; Miseikis, V.; Coletti, C.; De Seta, M./titolo:Early stage of CVD graphene synthesis on Ge(001) substrate/doi:10.1016%2Fj.carbon.2018.03.092/rivista:Carbon/anno:2018/pagina_da:183/pagina_a:188/intervallo_pagine:183–188/volume:134
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- 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.
- Subjects :
- Materials science
Nucleation
FOS: Physical sciences
chemistry.chemical_element
02 engineering and technology
Substrate (electronics)
Chemical vapor deposition
010402 general chemistry
01 natural sciences
Settore FIS/03 - Fisica della Materia
law.invention
law
Phase (matter)
cvd growth
General Materials Science
Condensed Matter - Materials Science
Graphene
graphene
stm
Materials Science (cond-mat.mtrl-sci)
General Chemistry
021001 nanoscience & nanotechnology
0104 chemical sciences
Faceting
germanium
chemistry
Chemical physics
xps
Scanning tunneling microscope
0210 nano-technology
Carbon
Subjects
Details
- ISSN :
- 00086223
- Volume :
- 134
- Database :
- OpenAIRE
- Journal :
- Carbon
- Accession number :
- edsair.doi.dedup.....78d69fe61ea66669fcf57f404f00e3c6