Abstract
Graphene, an extraordinary allotropy of carbon, the 2D nanosheet, have been synthesized through exfoliation of graphite in ortho dichloro benzene by sonication. The morphological changes in different interval of sonication have been investigated by Scanning Electron Microscopy (SEM) andTransmission Electron Microscopy (TEM). Raman Spectra confirmed the formation of defect free Graphene sheets. As prepared Graphene showed high thermal stability under N2 atmosphere. It has been observed that sonication for 4 hours, effectively exfoliates graphite to form Graphene sheets. However, further sonication leads to restacking of Graphene sheets. The formation of Graphene is supposed to be due to the Sonopolymerization of the solvent (ortho-dichloro benzene)and graphite solvent interaction.
Highlights
The discovery of Graphene stimulates the scientists to unlock a new aspect in the field of nanoscience and nanotechnology
The morphological changes in different interval of sonication have been investigated by Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM)
Transmission Electron Microscopy (TEM) All the samples were analyzed by TEM, JEOL 2100 in order to understand exact morphological change of Graphene dispersion in orthodichloro benzene (ODCB) with sonication time
Summary
The discovery of Graphene stimulates the scientists to unlock a new aspect in the field of nanoscience and nanotechnology. Graphene were synthesized by different procedures like mechanical exfoliation of graphite [6], Chemical vapor deposition method [7] etc. These are not efficient method to synthesize Graphene in commercial scale. The homogeneous Graphene dispersion in some common organic solvents like benzene, toluene, nitrobenzene etc was reported [14]. Polar solvents like N, N-dimethylformamide (DMF), N-methylpyrrolidone (NMP) can exfoliate graphite to form homogeneous Graphene dispersion [15,16]. The electronic structure of Graphene has been characterized by FTIR, SEM, TEM and Raman spectra The advantages of this synthesis method are its simplicity, absence of long term synthetic route and high yield. One of the major advantages of ODCB is, like other organic halides, it is known to decompose during sonication to liberate chlorine and polymerize [17,18]
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