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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 22:08 |
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Conference: Bucharest University Faculty of Physics 2012 Meeting
Section: Physics and Technology of Alternative Renewable Energy Supplies
Title:
Graphenes obtained from expanded graphite using Supercritical Fluids
Authors:
C. CEAUS , S.M. IORDACHE, Ana CUCU, L. POPOVICI, Ana M. DUCU, S. STAMATIN, Adriana BALAN, I. STAMATIN
Affiliation:
University of Bucharest, Faculty of Physics, Romania
3Nano-SAE Research Centre, University of Bucharest, Romania
E-mail
catalin@3nanosae.org
Keywords:
Graphene, Graphite, multi-layer, supercritical fluid
Abstract:
In this paper we report the multi-layer graphenes production based on expanded graphite ( Humer method) using supercritical fluids method. Under supercritical fluid conditions the conversion of expanded graphite in multi-layer graphenes is possible due to the solvating power and high diffusivity of different SCFs such as ethanol, DMF and methanol. In this process we insert the carbon material in a supercritical fluid, at a set temperature for a period of time in a high pressure vessel. Three supercritical fluids mixtures are used: ethanol/water: 50/50 , 80/ 20 and 100% ethanol ( v/v). Raman spectroscopy and atomic force microscopy (AFM) shows that SCF-graphene 2-5-multi-layered and has high conductivity. Graphene nanosheets (GN) held distinct and 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) that make them perfect candidate for a lot of applications.
Note:This work was financially supported by contract PNCDI-II-IDEI/64/2011
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