Role of grain boundaries in tailoring electronic properties of polycrystalline graphene by chemical functionalization
Seifert, Max (Technische Universität München. Physik Department)
Barrios Vargas, José Eduardo (Institut Català de Nanociència i Nanotecnologia)
Bobinger, Marco (Technische Universität München. Physik Department)
Sachsenhauser, Matthias (Technische Universität München. Physik Department)
Cummings, Aron (Institut Català de Nanociència i Nanotecnologia)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)
Garrido, Jose (Technische Universität München. Physik Department)

Data:	2015
Resum:	Grain boundaries, inevitably present in chemical vapor deposited graphene, are expected to have considerable impact on the development of graphene-based hybrid materials with tailored material properties. Wedemonstrate here the critical role of polycrystallinity on the chemical functionalization of graphene comparing ozone-induced oxidation with remote plasma hydrogenation. Weshow that graphene oxidation and hydrogenation occur in two consecutive stages upon increasing defect density: an initial step in which surface-bound functional groups are generated, followed by the creation of vacancies. Remarkably, we find that hydrogenation yields homogeneously distributed defects while ozone-induced defects are preferentially accumulated at the grain boundaries eventually provoking local cracking of the structure. Supported by quantum simulations, our experimental findings reveal distinct electronic transport regimes depending on the density and distribution of induced defects on the polycrystalline graphene films. Our findings highlight the key role played by grain boundaries during graphene functionalization, and at the same time provide a novel perspective to tailor the properties of polycrystalline graphene.
Ajuts:	European Commission 604391 European Commission 280433 Ministerio de Economía y Competitividad MAT2012-33911 Ministerio de Economía y Competitividad SEV-2013-0295
Nota:	Altres ajuts: Priority Program 1459 Graphene (German Research Foundation (DFG))
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Functionalization ; Grain boundary ; Graphene ; Hydrogenation ; Oxidation ; Polycrystalline
Publicat a:	2D Materials, Vol. 2, Núm. 2 (May 2015) , article 024008, ISSN 2053-1583

DOI: 10.1088/2053-1583/2/2/024008

Postprint 20 p, 943.8 KB

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