Preparation and characterization of graphene nanoplatelets from natural graphite via intercalation and exfoliation with tetraalkylammoniumbromide
| Autor: | Dai-Soo Lee, Pashupati Pokharel, Quang-Trung Truong, Gwang Seok Song |
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| Rok vydání: | 2012 |
| Předmět: |
chemistry.chemical_classification
Materials science Scanning electron microscope Intercalation (chemistry) Biomedical Engineering chemistry.chemical_element Bioengineering General Chemistry Condensed Matter Physics Exfoliation joint chemistry Chemical engineering Transmission electron microscopy General Materials Science Lithium Graphite Alkyl Graphene oxide paper |
| Zdroj: | Journal of nanoscience and nanotechnology. 12(5) |
| ISSN: | 1533-4880 |
| Popis: | A new method for the preparation of graphene nanoplatelets (GNP) from graphite intercalation compounds (GICs) was investigated. Donor-type ternary GICs of natural graphites, lithium ions and tetrahydrofurane (NG-Li-THF) were synthesized via a solution process, with the lithium ions in the GICs then exchanged with different tetra alkyl ammonium cations to expand the interlayer distance (d-spacing) of these GICs. Microwave irradiation of these GICs resulted in the exfoliation of GICs, forming so-called 'worm-like exfoliated graphites.' Sonication of the worm-like exfoliated graphites in acetone resulted in GNPs with different aspect ratios. Powder X-ray diffractometry, scanning electron microscopy and transmission electron microscopy were employed to characterize the GICs and GNPs. It was found that the ion-exchange of NG-Li-THF increased the volume expansion ratios, and the molecular structure of the tetra alkyl ammonium cations affected the aspect ratios of the GNPs after exfoliation. |
| Databáze: | OpenAIRE |
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