8-9th August, 2008 School of Materials Science & Nanotechnology,Jadavpur University
Synthesis Of Graphene And Some Graphene Based Composite Materials
Arpan Bhatacharyya and K. K. Chattopadhyay
Department Of Nano Science And Technology
Jadavpur University
Abstract:
Graphene sheets—one-atom-thick two-dimensional layers of sp2-bonded carbon—are predicted to have a range of unusual properties. Their thermal conductivity and mechanical stiffness may rival the remarkable in-plane values for graphite their fracture strength should be comparable to that of carbon nanotubes for similar types of defects; and recent studies have shown that individual graphene sheets have extraordinary electronic transport properties. One possible route to harnessing these properties for applications would be to incorporate graphene sheets in a composite material. The manufacturing of such composites requires not only that graphene sheets be produced on a sufficient scale but that they also be incorporated, and homogeneously distributed, into various matrices(Polymers like Poly Vinyl Alcohol or Poly Aniline). Here in this project a general approach for the preparation of graphene-polymer composites via complete exfoliation of graphite via chemical route using aqueous medium in presence of a proper surfactant and non aqueous dispersing medium(DMF). Finally the aqueous exfoliated graphene sheets were deposited on a gold coated glass substrate via electrophoretic deposition and the morphological studies of all the samples were performed. The measurement of electrical properties manifested the fact that the resistance of graphene based PVA composite decreases with increase of temperature and the percolation threshold also lie in between 1- 2%(w/w) of the filler.
Our bottom-up chemical approach of tuning the graphene sheet properties provides a path to a broad new class of graphene based materials and their use in a variety of applications.
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