Graphene,band opening

Dec 2012
Graphene is a wonder material with exotic properties. But, zero band gap in graphene hinders its application in logic devices. what are the factors responsible for bandgap opening in graphene? How band gap is opened by hetero atom doping and chemical modification in graphene?
Jan 2015
Graphene Bandgap

In Graphene it is possible to open bandgap in three ways : (1) By constraining large area graphene in one dimension to form carbon nanoribbon (or Quantum confinement)
(3)Applying Strain in graphene.