Graphene coatings: An efficient protection from oxidation

By M. Topsakal, Hasan Şahin, S. Ciraci. 2012

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(Received 6 November 2011; revised manuscript received 12 February 2012; published 23 April 2012)We demonstrate that graphene coating can provide efficient protection from oxidation by posing a high-energybarrier to the path of oxygen atom, which could have penetrated from the top of the graphene to the reactivesurface underneath. A graphene bilayer, which blocks the diffusion of oxygen with a relatively higher energybarrier, provides even better protection from oxidation. While an oxygen molecule is weakly bound to a baregraphene surface and hence becomes rather inactive, it can easily dissociate into two oxygen atoms adsorbed tolow-coordinated carbon atoms at the edges of a vacancy. For these oxygen atoms the oxidation barrier is reducedand hence the protection from oxidation provided by graphene coatings is weakened. Our predictions obtainedfrom the state-of-the-art first-principles calculations of the electronic structure, phonon density of states, andreaction path will unravel how graphene can be used as a corrosion-resistant coating and guide further studiesaimed at developing more efficient nanocoatings.DOI: 10.1103/PhysRevB.85.155445 PACS number(s): 81

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/88070250de23fc8b556cbab4e5b7cc0774add622

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