Studying the conversion of graphite into nanographene sheets using supercritical phase exfoliation method |
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Authors: | Muhammad Adel Randa Abdel-Karim Ahmed Abdelmoneim |
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Affiliation: | 1. Advanced Materials and Nanomaterials Multidisciplinary Program, Faculty of Engineering, Cairo University, Giza, Egypt;2. Graphene Center of Excellence for Energy and Electronic Applications, Egypt-Japan University of Science and Technology, New Borg El-Arab, Alexandria, Egypt;3. Materials Science and Engineering Department, Japan University of Science and Technology, New Borg El-Arab, Alexandria, Egypt;4. madel_eng@yahoo.com;6. Department of Metallurgy, Faculty of Engineering, Cairo University, Giza, Egypt;7. Graphene Center of Excellence for Energy and Electronic Applications, Egypt-Japan University of Science and Technology, New Borg El-Arab, Alexandria, Egypt;8. Basic and Applied Sciences Institute, Egypt-Japan University of Science and Technology, New Borg El-Arab, Alexandria, Egypt |
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Abstract: | AbstractThis work studies the application of supercritical-phase exfoliation method to produce 100% yield of high-quality graphene. This simple and cost-effective method utilizes supercritical carbon dioxide and ultrasonication to produce pure and defect-free mono-, few- and multi-layer graphene sheets. The process parameters such as pressure, sonication time, sonication amplitude and the amount of starting graphite were examined. The production of defect-free single-, few- and multi-layer graphene sheets was confirmed using atomic force microscopy and Raman spectroscopy. The Fourier-transform infrared spectroscopy confirms that our method does not cause any oxidation to the synthesized graphene. The conductivity of the best yield graphene sample has been tested by four-point probe method and high electrical conductivity of 8.5?×?104 S/m was recorded. The synthesized graphene can be used in many applications such as supercapacitors, batteries, composites and conductive inks. |
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Keywords: | Graphene supercritical CO2 sonication high quality high yield |
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