Controlled Distribution of Oxygen Adatoms on a Single Layer Graphene

초록

Tailoring the properties of graphene is important for next generation electronic, optical, and mechanical applications. Various chemical and physical methods have been studied for such modification. The physical methods include confinement of size and varying number of graphene layers. The physical methods need highly sophisticated instruments and their reproducibility is poor. Among chemical method, adding atoms to graphene is one of the promising methods for modifying graphene properties. The concentration or coverage of adatom defines the properties and such coverage can be controlled by various methods. Atomic force microscope (AFM) and scanning tunneling microscope (STM) are utilized for the control of adatoms preciously on the graphene surface. However, in these methods the modifications are restricted to the tip size, which is at nanoscale level. The theoretical studies also shown changes in various properties, like wetting property, magnetic property, and electrical property due to adatom concentration. Further theoretical studies shown the possibility of migration of adatoms for controlling graphene properties. In this study, we report the synthesis of clean and good quality single layer graphene oxide (SLGO) by physical method. We further controlled the coverage of oxygen adatoms by physical method and demonstrated its implication on the properties of single layer graphene.