SYNTHESIS OF HETEROATOM DOPED GRAPHENE QUANTUM DOTS VIA ONE-POT REACTION INCLUDING SIMULTANEOUS EXFOLIATING AND DOPING

摘要

Graphene quantum dots (GQDs) are consist of continuous hexagonal carbon structures and are generally defined single or ten-layered graphene sheets with smaller than 100 nm lateral dimensions. It has noticeably strong quantum confinement and edge effects due to their zero dimensions (OD), in contrast to graphene sheets.GQDs received much attention due to its unique properties of large surface area, excellent solubility, tunable band-gap, semiconducting properties, many active sites, fluorescence and low cytotoxicity. Because of its various properties, GQDs were proved as a potential material in various applications including light emitting diodes, biological imaging, catalyst supporting materials, optoelectronic devices and photovoltaic. However, although there are many approach to synthesize GQDs, no one achieved one-pot synthetic reaction for heteroatom doping process among the top-down methods. The harsh oxidation process also restricted GQDs to apply electronic devices due to many structural defects in GQDs plane. In this paper, we report a one-pot reaction for heteroatom doped GQDs using only graphite and NMP (N-methyl-2-pyrrolidone).