Black in colour Bright in Nature By B.Gopal 05-08-4124L GRAPHENE
History and experimental Discovery
Advantages and Limitations
“It is the thinnest known material in the universe, and the strongest ever measured,” wrote University of Manchester physicist Andre Geim.
Graphene is a one-atom-thick planar sheet.
The carbon-carbon bond length in graphene is about 0.142 nm.
3million Graphene sheets would be only one millimeter thick of Graphite.
The term graphene first appeared in 1987 to describe single sheets of graphite.
Theory of graphene was first explored by Philip R Wallace in 1947 as a starting point for understanding the electronic properties of more complex, 3D graphite.
Andre Geim and Kostya Novoselov at Manchester University managed to extract single-atom-thick crystallites (graphene) from bulk graphite in 2004.
In 2004, the Russian researchers obtained graphene by mechanical exfoliation of graphite.
The researchers simplified the technique and started using dry deposition.
There were a number of previous attempts to make atomically thin graphitic films vary by using exfoliation techniques.
Yet another method of obtaining graphene is to heat silicon carbide to high temperatures (>1100 °C) to reduce it to graphene.
Epitaxial graphene on silicon carbide can be patterned using standard microelectronics methods.
Many important graphene properties have been identified in graphene produced by this method. For example, the electronic band-structure (so-called Dirac cone structure) has been first visualized in this material.
Epitaxial growth on silicon carbide
High-sped computer chips
Nano Tubes and Ribbons
Very small in size
Can be used as 1D,2Dand 3D
Very high conductivity
Super conductor at room temperature .,etc
Comparatively very few disadvantages
Advantages & Disadvantages
H. P. Boehm, R. Setton, E. Stumpp (1994). "Nomenclature and terminology of graphite intercalation compounds". Pure and Applied Chemistry
H. C. Schniepp, J.-L. Li, M. J. McAllister, H. Sai, M. Herrera-Alonso, D. H. Adamson, R. K. Prud’homme, R. Car, D. A. Saville, I. A. Aksay (2006). "Functionalized Single Graphene Sheets Derived from Splitting Graphite Oxide". The Journal of Physical Chemistry
P. Boehm, A. Clauss, G. O. Fischer, U. Hofmann (1962). "Das Adsorptionsverhalten sehr dünner Kohlenstoffolien". Zeitschrift für anorganische und allgemeine Chemie