4.8 Article

Density controlled conductivity of pristine graphene films

Journal

CARBON
Volume 64, Issue -, Pages 435-443

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2013.07.096

Keywords

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Funding

  1. EPSRC/KTA
  2. Kwan Trust
  3. M-SOLV Ltd.
  4. EPSRC [EP/K031562/1] Funding Source: UKRI
  5. Engineering and Physical Sciences Research Council [EP/K031562/1] Funding Source: researchfish

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Single or few layer graphene can be considered an exciting pseudo-two-dimensional molecular material that potentially has a wide range of applications. A critical bottleneck may arise with issues in their controlled assembly into macroscopic ensembles over large areas both in two and three dimensions. Langmuir-type assembly is a particularly useful method to control and manipulate the distribution of graphene at the air-water interface via edge-edge interactions. In this study, pristine graphene suspended in organic solvent was prepared through adaptation of a previously developed process involving the non-invasive exfoliation of graphite. Successful deposition of graphene at the air-water interface was achieved by manipulating the vapor-pressure of the graphene dispersion through solvent mixing. Through careful control of density by following the pressure-area isotherm during monolayer compression, it is possible to precisely tune the electrical conductivity The resulting assemblies can be easily transferred to glass and other substrates using the Langmuir-Schaefer horizontal deposition method producing thin films with tunable electrical conductivity that exhibits percolation-type behavior. A major advantage of this process is that the conducting films require no further treatment unlike their graphene-oxide counterparts. Moreover, the physical properties of these assemblies can be easily controlled which is a precursor for graphene-based electronic applications. (C) 2013 Elsevier Ltd. All rights reserved.

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