Investigating the preparation routes to aqueous graphene dispersions and their influence on electrical conductivity of polymer composites

M. Ghislandi, E. Tkalya, A. Alekseev, C. E. Koning, G. De With

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Graphene was produced from graphite powder using the three best known water-based conversion approaches. The first two are based on chemical oxidation methods, only differing in the reduction process, either by the use of hydrazine or by thermal expansion, respectively. The third one is based on long-term ultrasonic exfoliation. Water/surfactant solutions were prepared with these three nanofillers and latex technology was applied for the preparation of conductive graphene/polystyrene composites, with well-dispersed graphene platelets. Microscopic studies showed that both reduction processes lead to agglomeration/wrinkling of the nanoplatelets, even though they yield composites with high conductivity and low percolation threshold. Although mechanical ultrasound exfoliation of graphite produces less defective multi-layer graphene, these platelets have a smaller lateral size and their composites exhibit a higher percolation threshold.

Original languageEnglish
Title of host publicationTechnical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012
Pages322-325
Number of pages4
Publication statusPublished - Aug 20 2012
EventNanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012 - Santa Clara, CA, United States
Duration: Jun 18 2012Jun 21 2012

Publication series

NameTechnical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012

Other

OtherNanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012
CountryUnited States
CitySanta Clara, CA
Period6/18/126/21/12

Keywords

  • Aqueous dispersion
  • Electrical conductivity
  • Graphene
  • Polymer composites

ASJC Scopus subject areas

  • Ceramics and Composites
  • Surfaces, Coatings and Films

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  • Cite this

    Ghislandi, M., Tkalya, E., Alekseev, A., Koning, C. E., & De With, G. (2012). Investigating the preparation routes to aqueous graphene dispersions and their influence on electrical conductivity of polymer composites. In Technical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012 (pp. 322-325). (Technical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012).