Experimental and theoretical study of the influence of the state of dispersion of graphene on the percolation threshold of conductive graphene/polystyrene nanocomposites

Evgeniy Tkalya, Marcos Ghislandi, Ronald Otten, Mustafa Lotya, Alexander Alekseev, Paul Van Der Schoot, Jonathan Coleman, Gijsbertus De With, Cor Koning

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Abstract

The effect of the dispersed state of graphene is studied as a factor influencing the electrical percolation threshold of graphene/polystyrene nanocomposites. We find the percolation threshold of our nanocomposites, prepared with graphene dispersions with different thermodynamic stabilities, degrees of exfoliation, and size polydispersities, to range from 2 to 4.5 wt %. Connectedness percolation theory is applied to calculate percolation thresholds of the corresponding nanocomposites, based on the premise that size polydispersity of graphene platelets in the corresponding solutions must have a strong influence on it. Theory and experimental results agree qualitatively.

Original languageEnglish
Pages (from-to)15113-15121
Number of pages9
JournalACS Applied Materials and Interfaces
Volume6
Issue number17
DOIs
Publication statusPublished - Sep 10 2014

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Keywords

  • graphene
  • percolation threshold
  • polymer nanocomposites

ASJC Scopus subject areas

  • Materials Science(all)

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