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High-power splitting of expanded graphite to produce few-layer graphene sheets
- Source :
- Carbon. 49:2862-2868
- Publication Year :
- 2011
- Publisher :
- Elsevier BV, 2011.
-
Abstract
- Few-layer graphene sheets were prepared by splitting expanded graphite using high-power sonication. Atomic-level calibrated scanning transmission electron microscopy was used to obtain efficient layer statistics, enabling optimization of the experimental conditions. This resulted in a two-step splitting mechanism in which the mean number of layers was first reduced to less than 20 by heating to 1100 °C and then to a few-layer region by a 5-min 104 W Lā1 ā power-density sonication. Raman spectroscopic analysis confirms the above mechanism and demonstrates that the sheets are largely free of defects and functional groups.
Details
- ISSN :
- 00086223
- Volume :
- 49
- Database :
- OpenAIRE
- Journal :
- Carbon
- Accession number :
- edsair.doi...........a576392bc2bf5d0535398f116549f174