Graphene : A Light Star On The Horizon Of Material Science

1347 WordsNov 7, 20146 Pages
INTRODUCTION Graphene is a two-dimensional material (2D), composed of layers of carbon atoms packed into a honeycomb network, has become a sparkling rising star on the horizon of material science in the last several years. Even though GN is the mother of all graphitic forms, including 0D fullerene, 1D carbon nanotubes (CNT) and 3D graphite, which have been intensively studied for decades, not too much attention was paid to GN before. Graphene, a monolayer of sp2 hybridized carbon atoms arranged in a honeycomb lattice, is an interesting material with a range of unusual properties. Long-range pi-conjugation in graphene yields remarkable and unique properties, such as high values of its Young’s modulus (1.0 TPa), large theoretical specific surface area (2630m2 g-1),excellent thermal conductivity (5000 W m-1 K-1), high mobility of charge carriers (200 000 cm2 V-1 s-1), and optical transmittance (97.7%). These excellent properties support GN as an ideal building blocks in nanocomposites. Nanocomposites are multiphase materials, in which one phase (dispersed phase) in the nanosize regime is dispersed in a second phase (matrix/ continuous phase), resulting in a combination of the individual properties of the component materials. Researchers are now making rapid progress in the study of the synthesis and properties of novel graphene-based nanocomposites besides creating feasible synthesis approaches to generate highly ‘purity’ graphene sheets at the present time. Graphene is

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