Temporospatial distribution of oxygen adatoms on a single layer graphene

초록

Graphene has attracted significant interest due to its extraordinary properties and tailoring these properties of graphene is important for next generation electronic, optical, and mechanical applications. Both chemical and physical techniques have been studied for such modification. The physical techniques include confinement of size and varying number of graphene layers. Such physical techniques need highly sophisticated instruments but their reproducibility is poor. Among chemical techniques, surface functionalization is one of the promising method for modifying graphene properties. However, chemical method has inherent limitation in temporospatial distribution of dopant. Atomic force microscope and scanning tunneling microscope are utilized for the control of adatoms locally on the graphene surface. However, in these methods the modifications are restricted to nanoscale level. In this study, we report the synthesis of clean and good quality single layer graphene oxide (SLGO) by thermal oxidization of single layer graphene (SLG). Then, we controlled the coverage of oxygen adatoms in SLGO using physical method via electromigration technique. Raman mapping was utilized to differentiate the graphene and graphene oxide loci in SLGO samples. Finally we demonstrate the implication of adatom migration on the properties of graphene.