Reference : Graphene liquid crystal retarded percolation for new high-k materials

	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics
	To cite this reference:	http://hdl.handle.net/10993/23747

Title :	Graphene liquid crystal retarded percolation for new high-k materials
Language :	English
Author, co-author :	Yuan, Jinkai [Centre National de la Recherche Scientifique - CNRS > Université de Bordeaux > Centre de Recherche Paul Pascal > ; Université de Bordeaux > CNRS, Solvay, LOF, UMR 5258]
	Luna, Alan [Centre National de la Recherche Scientifique - CNRS > Université de Bordeaux > Centre de recherche Paul Pascal]
	Neri, Wilfrid [Centre National de la Recherche Scientifique - CNRS > Université de Bordeaux > Centre de r]
	Zakri, Cécile [Centre National de la Recherche Scientifique - CNRS > Université de Bordeaux > Centre de r]
	Schilling, Tanja [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Poulin, Philippe [Centre National de la Recherche Scientifique - CNRS > Université de Bordeaux > Centre de r]
Publication date :	16-Nov-2015
Journal title :	Nature Communications
Publisher :	Nature Pub.lishing Group
Peer reviewed :	Yes (verified by ORBilu)
Audience :	International
e-ISSN :	2041-1723
City :	London
Country :	United Kingdom
Keywords :	[en] THRESHOLD ; OXIDE ; NANOCOMPOSITES ; COMPOSITES ; PERMITTIVITY ; DISPERSIONS ; FLUORIDE ; KINETICS ; BEHAVIOR ; SHEETS
Abstract :	[en] Graphene flakes with giant shape anisotropy are extensively used to establish connectedness electrical percolation in various heterogeneous systems. However, the percolation behaviour of graphene flakes has been recently predicted to be far more complicated than generally anticipated on the basis of excluded volume arguments. Here we confirm experimentally that graphene flakes self-assemble into nematic liquid crystals below the onset of percolation. The competition of percolation and liquid crystal transition provides a new route towards high-k materials. Indeed, near-percolated liquid-crystalline graphene-based composites display unprecedented dielectric properties with a dielectric constant improved by 260-fold increase as compared with the polymer matrix, while maintaining the loss tangent as low as 0.4. This performance is shown to depend on the structure of monodomains of graphene liquid-crystalline phases. Insights into how the liquid crystal phase transition interferes with percolation transition and thus alters the dielectric constant are discussed.
Funders :	Labex AMADEus
Permalink :	http://hdl.handle.net/10993/23747
DOI :	10.1038/ncomms9700

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