Tunable electronic properties of Pt-doped zigzag graphene nanoribbons

Graphene, since its experimental realization in 2004, attracts considerable attention due to its interesting physical properties and promising applications in nanoelectronics. The electronic properties of graphene can be controlled through the chemical adsorption or the incorporation of impurities [1]. Doping of graphene with transition metal atoms has also received considerable attention due to strong bonding between metal and carbon atoms and interesting magnetic properties [2]. Recently, the interaction of individual Au or Pt atoms with a single graphene sheet has been investigated experimentally in a transmission electron microscope (TEM) [3]. Subsequently, Zhang et al. studied the migration of gold atoms attached to single vacancies near the edges of graphene ribbons using density-functional theory [4]. So we further investigate the electronic properties of ZGNRs with Pt doping at different sites. In particular, we believe that Pt will play an interesting role on the electronic properties of ZGNRs.