Factors influencing graphene growth on metal surfaces
By E. Loginova, N. Bartelt, P. Feibelman, K. Mccarty. 2009
251 citations recorded by the source corpus.
Graphene forms from a relatively dense, tightly bound C-adatom gas when elemental C is deposited on or segregates to the Ru(0001) surface. Nonlinearity of the graphene growth rate with C-adatom density suggests that growth proceeds by addition of C atom clusters to the graphene edge. The generality of this picture has now been studied by use of low-energy electron microscopy (LEEM) to observe graphene formation when Ru(0001) and Ir(111) surfaces are exposed to ethylene. The finding that graphene growth velocities and nucleation rates on Ru have precisely the same dependence on adatom concentration as for elemental C deposition implies that hydrocarbon decomposition only affects graphene growth through the rate of adatom formation. For ethylene, that rate decreases with increasing adatom concentration and graphene coverage. Initially, graphene growth on Ir(111) is like that on Ru: the growth velocity is the same nonlinear function of adatom concentration (albeit with much smaller equilibrium adatom concentrations, as we explain with DFT calculations of adatom formation energies). In the later stages of growth, graphene crystals that are rotated relative to the initial nuclei nucleate and grow. The rotated nuclei grow much faster. This difference suggests firstly, that the edge-orientation of the graphene sheets relative to the substrate plays an important role in the growth mechanism, and secondly, that attachment of the clusters to the graphene is the slowest step in cluster addition, rather than formation of clusters on the terraces.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/078c42e4c18c18c2ca352eb95c0b434d8e4713c0
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Citations in the corpus
- Graphene growth and stability at nickel surfaces (2011, background): “Large barriers for carbon attachment have also been reported for graphene growing on other transition metal surfaces [37, 38].”
- Electronic and geometric corrugation of periodically rippled, self-nanostructured graphene epitaxially grown on Ru(0001) (2010, background): “Similar misalignment between the carbon lattice and the ripples can be observed in LEED patterns measured with a low-energy electron microscope (LEEM) on a single domain island of epitaxial gr/Ru(0001) but went unnoticed [7, 24].”
- Growth of Epitaxial Graphene: Theory and Experiment (2014, methodology): “[54, 92] the flux of the carbon atoms arriving at the surface, F , and the diffusion related constant for their motion across it, D, were used in rate equations for the homogeneous densities of carbon monomers c(t), five atom clusters c5(t) and graphene islands G.”