Carbon nitride vs. Graphene

GRAPHENE a candidate material for ‘‘post-silicon electronics’’
1. Advantage: it's exciting combination of high electrical and thermal conductivity, and stability
2. Disadvantage: 
  + the (semi-)metallic character
  + the absence of an electronic band gap
3. Strategies  to  open  up  a  graphene  band  gap:
  + single-  or  multi-step  modifications  by  physical  and  chemical  means
  + introduction  of  defects  through  deletion  of carbon  atoms
  + the  incorporation  of  heteroatoms
 * Drawback: it involve  physical  damage  to  the (ideally)  infinite  2D  carbon  lattice,  and  may  also  hamper  either the  geometry  (e.g.,  in  nanoribbons)  or  the  properties  (e.g.,  charge mobility)  of  pristine  graphene
4. Solution:
=> The invention of ‘‘triazine-based  graphitic  carbon nitride’’ (carbon nitride)
[For the past, only  five  materials  of the  ‘‘graphene  family’’  are  known:  graphene,  hBN,  BCN,  fluorographene,  and  graphene  oxide]
5. Properties of carbon nitride:
it  consists  exclusively  of  covalently-linked,  sp2-hybridized carbon  and  nitrogen  atoms  in  an  alternating  fashion

6.Result:

Band gap: 1.6 - 2.0 eV