Carbon Allotropes, Band Theory of Solids
Network solids are giant molecules
Difference between graphite sheets of hexagons of C and diamond 3D tetrahedral network; properties related to structures
Novel carbon frameworks C-60 buckyball; nanotubes
Conductivity varies metals >> semiconductors > insulators
In large crystals MOs combine to give bands; valence band; conduction band
Doping of insulator like Si with P gives n-type semiconductor
Doping of Si with Al gives p-type semiconductor
p/n junctions yield transistors and chips
Glasses: common ones made from quartz, sodium carbonate, calcium oxide; amorphous
Carbon Allotropes, Band Theory of Solids
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