▎ 摘　　要

The dielectric response of pentagonal defects in multilayer graphene nano-cones has been studied by electron energy loss spectroscopy and ab initio simulations. At the cone apex, a strong modification of the dielectric response is observed below the energy of the pi plasmon resonance. This is attributed to pi -> pi* interband transitions induced by topology-specific resonant pi bonding states as well as pi*-sigma* hybridization. It is concluded that pentagonal defects strongly affect the local electronic structure in such a way that multi-walled graphene nano-cones should show great promise as field emitters.