Local electron mean free path versus the Fermi energy measured on array of several tip positions on pristine and irradiated graphene at different fluences. On pristine graphene (a). On irradiated graphene with 500 keV C+ ions at fluences 1 × 1013 cm-2 (b) and 1 × 1014 cm-2 (c), respectively.
Giannazzo et al. Nanoscale Research Letters 2011 6:109 doi:10.1186/1556-276X-6-109