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Functionalised graphene sheets as effective high dielectric constant fillers

Laura J Romasanta, Marianella Hernández, Miguel A López-Manchado and Raquel Verdejo*

Author Affiliations

Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, Juan de la Cierva 3, 28006, Madrid, Spain

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Nanoscale Research Letters 2011, 6:508  doi:10.1186/1556-276X-6-508

Published: 25 August 2011

Abstract

A new functionalised graphene sheet (FGS) filled poly(dimethyl)siloxane insulator nanocomposite has been developed with high dielectric constant, making it well suited for applications in flexible electronics. The dielectric permittivity increased tenfold at 10 Hz and 2 wt.% FGS, while preserving low dielectric losses and good mechanical properties. The presence of functional groups on the graphene sheet surface improved the compatibility nanofiller/polymer at the interface, reducing the polarisation process. This study demonstrates that functionalised graphene sheets are ideal nanofillers for the development of new polymer composites with high dielectric constant values.

PACS: 78.20.Ci, 72.80.Tm, 62.23.Kn

Keywords:
dielectric properties; graphene; interfacial polarisation; nanocomposites; silicones