Quantum Dots at Room Temperature carved out from Few-Layer Graphene
  We present graphene quantum dots endowed with addition energies as large as 1.6 eV, fabricated by the controlled rupture of a graphene sheet subjected to a large electron current in air. The size of the quantum dot islands is estimated to be in the 1 nm range. The large addition energies allow for Coulomb blockade at room temperature, with possible application to single-electron devices. 
Amelia Barreiro, Herre S. J. van der Zant, Lieven M. K. Vandersypen
cond-mat.mes-hall