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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:25 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Physics and Technology of Renewable and Alternative Energy Sources
Title:
Methods for producing few-layer graphenes. Raman characterization
Authors:
Catalin CEAUS(1), Ana CUCU(2), Popovici LAURENTIU(1), Ana-Maria IORDACHE(1)
Affiliation:
1)University of Bucharest, Faculty of Physics,
2)3Nano-SAE Research Centre, Bucharest-Magurele, Romania
E-mail
catalin@3nanosae.org
Keywords:
graphene, raman, supercritical fluids, few-layer
Abstract:
Few studies deal with methods for graphite exfoliation at moderate pressures and temperature in different solvents (e.g. water, ethanol, tetrahydofuran, DMF, methanol). On the other hand, the expandable graphite is a stack of intercalated graphene with different inercalants like nitric, sulphuric, acetic compounds. Three supercritical fluids mixtures are used in different water-methanol ratio. Graphene held unique properties (intrinsic mobility limit of 2 x 105 cm2 V-1s-1, high specific surface area, thermal conductivity above 2,000 W/mK - for monolayer graphene). Structural investigation by atomic force microscopy (AFM), Raman spectroscopy and scanning electron microscopy reveal structures with a single to a few layers (up to five) of graphene. This report provides a simple and low-cost approach for the production of graphene sheets, with a wide range of applications.
Acknowledgement:
Catalin Ceaus was supported by the strategic grant POSDRU/159/1.5/S/133652, ”Integrated system to improve the quality of doctoral and postdoctoral research in Romania and promotion of the role of science in society” cofinanced by the European Social Found within the Sectorial Operational Program Human Resources Development 2007 – 2013.
This work was supported by a grant of the Romanian National Authority for Scientific Research, Program for research- PNCDI-II project number 64/2011, PNCDI-II- project number 66/2013.
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