Few-layer graphene by assisted-exfoliation of graphite with layered silicate |
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| Affiliation: | 1. Department of Chemical and Environmental Engineering, Nanoscience Institute of Aragón (INA), Universidad de Zaragoza, 50018 Zaragoza, Spain;2. Laboratorio de Microscopía Avanzada, Nanoscience Institute of Aragón (INA), Universidad de Zaragoza, 50018 Zaragoza, Spain;1. Department of Solid State Physics, Indian Association for the Cultivation of Science, Kolkata 700032, India;2. Nanostructured Materials Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India;1. Soreq NRC, Yavne 81800, Israel;2. Ariel University Center, Ariel 40700, Israel;1. Department of Pediatric Surgery, Huai''an Women and Children''s Hospital, Jiangsu, China;2. Department of General surgery, Huai''an First People''s Hospital, Nanjing Medical University, Huai''an, Jiangsu, China;1. Department of Physics, University College, Kurukshetra University, Kurukshetra 136119, Haryana, India;2. Department of Physics, Kurukshetra University, Kurukshetra 136119, Haryana, India;3. Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, IA 50011-3020, USA;4. Department of Physics, Guru Jambheshwar University of Science & Technology, Hisar 125001, Haryana, India;5. New Technologies – Research Centre, University of West Bohemia, Univerzitni 8, 306 14 Pilsen, Czech Republic;6. School of Material Engineering, University Malaysia Perlis, 01007 Kangar, Perlis, Malaysia |
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| Abstract: | Few-layer graphene has been achieved in liquid dispersion from graphite by the assistance of titanosilicate JDF-L1, using ultrasound and methanol as dispersive media. After a sedimentation step, both the dispersed and the sedimented phases were collected and then the titanosilicate was removed by alkaline hydrothermal dissolution from the mixed materials to obtain few-layer graphene (FLG) and sedimented material, respectively. The production of smaller particles was confirmed by means of N2 adsorption and zeta-potential measurements, so that the BET specific surface area increased from 20 m2/g of the raw graphite to 333 ± 22 m2/g in FLG. Raman spectroscopy shows a decrease in the ratio of intensities of the peaks G and 2D from 3.8 in the raw material to 2.5 in FLG. Particles as fine as 1.3 nm, corresponding to 4-layered FLG, were observed by AFM, while high-resolution TEM showed defect-free regions of graphene. |
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