LAPSE:2020.0180
Published Article
LAPSE:2020.0180
Exfoliation Behavior of Large Anionic Graphite Flakes in Liquid Produced by Salt-Assisted Ball Milling
Yoshihiko Arao, Jonathon D. Tanks, Kojiro Aida, Masatoshi Kubouchi
February 12, 2020
Functionalization of graphite is crucial for efficient and effective exfoliation to graphene. When negative charges are fixed to the edges of natural graphite, the resulting anionic graphite shows negative charging in a polar solvent. This enhanced negative charging is assumed to contribute the exfoliation of graphite during liquid-phase exfoliation (LPE). In this study, we prepared large anionic graphite flakes (~10 μm) by salt-assisted ball milling, as well as natural graphite flakes of the same size for comparison. During the LPE process, centrifugation speed and solvent type have dominant effects on graphene concentration and quality (e.g., size and thickness), so we investigated these factors for anionic graphite flakes in detail. The anionic graphite showed higher exfoliation efficiency in every type of solvent (isopropanol, methyl ethyl ketone, acetone, and water-based cosolvent) compared with the natural graphite. Monolayer graphene, with an average size of 80−200 nm, was obtained with relatively high yield (>10%) at only 3 min of sonication. The small size of graphene was due to edge fragmentation during the LPE process. The recyclability of the sediment and the characterization of the exfoliated powders for anionic graphene were also investigated.
Keywords
characterization, graphene, graphite structure, liquid-phase exfoliation
Subject
Suggested Citation
Arao Y, Tanks JD, Aida K, Kubouchi M. Exfoliation Behavior of Large Anionic Graphite Flakes in Liquid Produced by Salt-Assisted Ball Milling. (2020). LAPSE:2020.0180
Author Affiliations
Arao Y: School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro, Tokyo 152-8550, Japan [ORCID]
Tanks JD: National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan
Aida K: School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro, Tokyo 152-8550, Japan
Kubouchi M: School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro, Tokyo 152-8550, Japan
Journal Name
Processes
Volume
8
Issue
1
Article Number
E28
Year
2019
Publication Date
2019-12-24
Published Version
ISSN
2227-9717
Version Comments
Original Submission
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PII: pr8010028, Publication Type: Journal Article
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LAPSE:2020.0180
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doi:10.3390/pr8010028
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Feb 12, 2020
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CC BY 4.0
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Feb 12, 2020
 
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Original Submitter
Calvin Tsay
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