Week 8 Graphene Flashcards
1
Q
why does the nearly-free electron model have energy gaps
A
interference between wave function and lattice
2
Q
why does the tight bonding model have energy gaps
A
atomic energy levels
3
Q
why does carbon have so many different structures
A
hybridisation of sp orbitals
4
Q
briefly summarise sp2 and sp3 hybridisation shapes
A
> sp2 gives trigonal planar + single tetrahedral
>sp3 gives a full tetrahedral
5
Q
what allows for the tight bonding model to be applied to graphene
A
the honeycomb structre means that the carbon atoms have sigma bonds from covalent bonding and the the Pz electron is a π electron
6
Q
what is true of the ground state configuration
A
filled lower band and upper band is empty
