Questions of Graphite~~

Why Graphite can conduct electricity?

and

Why it is GOOD electrical conductor?

Tags:

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

Graphite

Graphite's crystal structure is made up of 2-D sheets of interlocking 6-membered benzene-like rings of carbons. The delocalized pi-bonding orbitals (ring structure is sp2) interact weakly in between layers to hold adjacent layers together. These half-full pi-orbitals are the obvious choice for the conduction band, and a quick sketch of the band diagram for graphite confirms this, having (in lowest to highest energy) a full sp2 bonding orbital followed by a small band gap, and then the half-full nonbonding pi system, followed by a band gap, and then the empty antibonding sp2 hybrid orbitals. This is why graphite is a conductor, and the fact that the pi-system is half full makes it a good conductor, although only along the planes of the 2-D sheets. Hope this answers your question.

WebElements: the periodic table on the WWW [http://www.webelements.com/]

Copyright 1993-20010 Mark Winter [The University of Sheffield and WebElements Ltd, UK]. All rights reserved.