On the mechanisms of precipitation of graphene on nickel thin films

Growth on transition metal substrates is becoming a method of choice to prepare large-area graphene foils. In the case of nickel, where carbon has a significant solubility, such a growth process includes at least two elementary steps: 1) carbon dissolution into the metal, and 2) graphene precipitati...

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Bibliographic Details
Published in:Europhysics letters 2011-11, Vol.96 (4), p.46003
Main Authors: Baraton, L, He, Z. B, Lee, C. S, Cojocaru, C. S, Châtelet, M, Maurice, J.-L, Lee, Y. H, Pribat, D
Format: Article
Language:English
Subjects:
68.65.Pq
81.05.ue
81.16.Hc
Condensed Matter
Materials Science
Physics
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Summary:Growth on transition metal substrates is becoming a method of choice to prepare large-area graphene foils. In the case of nickel, where carbon has a significant solubility, such a growth process includes at least two elementary steps: 1) carbon dissolution into the metal, and 2) graphene precipitation at the surface. Here, we dissolve calibrated amounts of carbon in nickel films, using carbon ion implantation, and annealing at 725 ○C or 900 ○C. We then use transmission electron microscopy to analyse the precipitation process in detail: the latter appears to imply carbon diffusion over large distances and at least two distinct microscopic mechanisms.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/96/46003