Graphene

atoms arranged to a hexagonal network. 2D crystal based. Has fold symmetry. Single sheet of graphite.

Unit Cell

• A rhombus with
• Lattice parameter (side length of a unit cell) where is the bond length
• 2 atoms per unit cell

Note

Single layer of graphene was discovered using scotch tape method and the discovery won a Nobel prize in 2010.

Synthesis

• Top-down approaches
  • Exfoliation (eg: Scotch tape method)
• Bottom-up approaches
  • Chemical vapor deposition

Properties

• Band gap is
• High tensile strength ()
• High young’s modulus ()
• High charge carrier mobility ()
• Highly transparent ()