On the mechanisms of precipitation of graphene on nickel thin films

Abstract : 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.
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Submitted on : Wednesday, June 29, 2011 - 3:42:02 PM
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L. Baraton, Z. B. He, C. S. Lee, C.S. Cojocaru, Marc Châtelet, et al.. On the mechanisms of precipitation of graphene on nickel thin films. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2011, 96, pp.46003. ⟨10.1209/0295-5075/96/46003⟩. ⟨hal-00601452v2⟩

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