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We have investigated the way in which the concentration and distribution ofadatoms affect the geometric and electronic properties of graphene. Ourcalculations were based on the use of first principle under the densityfunctional theory which reveal various types of $\pi$-bonding. The energy bandstructure of this doped graphene material may be explored experimentally byemploying angle-resolved photo-emission spectroscopy (ARPES) for electronicband structure measurements and scanning tunneling spectroscopy (STS) for thedensity-of-states (DOS) both of which have been calculated and reported in thispaper. Our calculations show that such adatom doping is responsible for thedestruction or appearance of the Dirac cone structure.

Adatom Doping-Enriched Geometric and Electronic Properties of Pristine Graphene: a Method to Modify the Band Gap