Graphene was produced from graphite powder using the three best known water-based conversionapproaches. The first two are based on chemical oxidation methods, only differing in the reduction pro-cess, either by the use of hydrazine or by thermal expansion, respectively. The third one is based onlong-term ultrasonic exfoliation. Water/surfactant solutions were prepared with these three nanofillersand latex technology concept was applied for the preparation of conductive graphene/polystyrenecomposites with well-dispersed graphene platelets. The samples were characterized with respectto filler properties and morphology, and their influences on electrical conductive properties of thecomposites were compared. Microscopic studies showed that both reduction processes lead to agglom-eration/wrinkling of the platelets, even though they yield composites with high conductivity and lowpercolation threshold. Although mechanical ultrasound exfoliation of graphite produces less defectivemulti-layer graphene, these platelets have a smaller lateral size and their composites exhibit a higherpercolation threshold. Differences in electronic transport behavior were observed, which suggest directcontact transport competing with tunneling.
- Graphenelatex Technologyelectrical Conductivitypolymer Compositesa
ASJC Scopus subject areas
- Materials Science(all)