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 language | English |
|---|---|
| Title of host publication | Technical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012 |
| Pages | 322-325 |
| Number of pages | 4 |
| Publication status | Published - 2012 |
| Externally published | Yes |
| Event | Nanotechnology 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 2012 → Jun 21 2012 |
Other
| Other | Nanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012 |
|---|---|
| Country | United States |
| City | Santa Clara, CA |
| Period | 6/18/12 → 6/21/12 |
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Keywords
- Aqueous dispersion
- Electrical conductivity
- Graphene
- Polymer composites
ASJC Scopus subject areas
- Ceramics and Composites
- Surfaces, Coatings and Films
Cite this
Investigating the preparation routes to aqueous graphene dispersions and their influence on electrical conductivity of polymer composites. / Ghislandi, M.; Tkalya, E.; Alekseev, A.; Koning, C. E.; De With, G.
Technical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012. 2012. p. 322-325.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Investigating the preparation routes to aqueous graphene dispersions and their influence on electrical conductivity of polymer composites
AU - Ghislandi, M.
AU - Tkalya, E.
AU - Alekseev, A.
AU - Koning, C. E.
AU - De With, G.
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
KW - Aqueous dispersion
KW - Electrical conductivity
KW - Graphene
KW - Polymer composites
UR - http://www.scopus.com/inward/record.url?scp=84864966853&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84864966853&partnerID=8YFLogxK
M3 - Conference contribution
SN - 9781466562745
SP - 322
EP - 325
BT - Technical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012
ER -