Field emission from single and few-layer graphene flakes
  We report the observation and characterization of field emission current from individual single- and few-layer graphene flakes laid on a flat SiO2/Si substrate. Measurements were performed in a scanning electron microscope chamber equipped with nanoprobes, used as electrodes to realize local measurements of the field emission current. We achieved field emission currents up to 1 {\mu}A from the flat part of graphene flakes at applied fields of few hundred V/{\mu}m. We found that emission process is stable over a period of several hours and that it is well described by a Fowler-Nordheim model for currents over 5 orders of magnitude. 
S. Santandrea, F. Giubileo, V. Grossi, S. Santucci, M. Passacantando,   T. Schroeder, G. Lupina, and A. Di Bartolomeo
cond-mat.mes-hall cond-mat.mtrl-sci