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      Graphene coatings: an efficient protection from oxidation

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      Author
      Topsakal, M.
      Şahin, H.
      Çıracı, Salim
      Date
      2012
      Source Title
      Physical Review B - Condensed Matter and Materials Physics
      Print ISSN
      2469-9950
      Electronic ISSN
      2469-9969
      Publisher
      American Physical Society
      Volume
      85
      Issue
      15
      Pages
      155445-7 - 155445-1
      Language
      English
      Type
      Article
      Item Usage Stats
      129
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      Abstract
      We demonstrate that graphene coating can provide efficient protection from oxidation by posing a high-energy barrier to the path of oxygen atom, which could have penetrated from the top of the graphene to the reactive surface underneath. A graphene bilayer, which blocks the diffusion of oxygen with a relatively higher energy barrier, provides even better protection from oxidation. While an oxygen molecule is weakly bound to a bare graphene surface and hence becomes rather inactive, it can easily dissociate into two oxygen atoms adsorbed to low-coordinated carbon atoms at the edges of a vacancy. For these oxygen atoms the oxidation barrier is reduced and hence the protection from oxidation provided by graphene coatings is weakened. Our predictions obtained from the state-of-the-art first-principles calculations of the electronic structure, phonon density of states, and reaction path will unravel how graphene can be used as a corrosion-resistant coating and guide further studies aimed at developing more efficient nanocoatings. © 2012 American Physical Society.
      Keywords
      81.16.Pr
      68.65.Pq
      66.30.Pa
      81.05.ue
      Permalink
      http://hdl.handle.net/11693/21501
      Published Version (Please cite this version)
      http://dx.doi.org/10.1103/PhysRevB.85.155445
      Collections
      • Department of Physics 2299
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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