Journal
NANOMATERIALS
Volume 9, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/nano9121785
Keywords
graphene; large size; pulsed wire discharge; graphite strip
Categories
Funding
- National Natural Science Foundation of China [11521062]
- State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology [ZDKT18-01]
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The synthesis of large-size graphene materials is still a central focus of research into additional potential applications in various areas. In this study, large-size graphene platelets were successfully produced by pulsed discharge of loose graphite strips with a dimension of 2 mm x 0.5 mm x 80 mm in distilled water. The graphite strips were made by pressing and cutting well-oriented expanded graphite paper. The recovered samples were characterized by various techniques, including TEM, SEM, optical microscopy (OM), atomic force microscopy (AFM), XRD and Raman spectroscopy. Highly crystalline graphene platelets with a lateral dimension of 100-200 mu m were identified. The high yield of recovered graphene platelets is in a range of 90-95%. The results also indicate that increasing charging voltage improves the yield of graphene platelets and decreases the number of graphitic layers in produced graphene platelets. The formation mechanism of graphene platelets was discussed. This study provides a one-step cost-effective route to prepare highly crystalline graphene platelets with a sub-millimeter lateral size.
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