Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 28, Pages 15455-15459Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp501930a
Keywords
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Funding
- ANPCyT Project [PICT PRH 61]
- SeCyT-UNC
- Trieste's ICTP
- CONICET
- [PICT-324]
- [PME (2006) 1544]
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Liquid-phase exfoliation is one of the most promising routes for large-scale production of multilayer graphene dispersions. These dispersions, which may be used in coatings, composites, or paints, are believed to contain disorder-free graphene multilayers. Here, we address the nature of defects in such samples obtained by liquid-phase exfoliation of graphite powder in N-methyl-2-pyrrolidone. Our Raman spectroscopy data challenge the assumption that these multilayers are free of bulk defects, revealing that defect localization strongly depends on the sonication time. For short ultrasound times, defects are located mainly at the layer edges but they turn out to build up in the bulk for ultrasonic times above 2 h. This knowledge may help to devise better strategies to achieve high-quality graphene dispersions.
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