title: Facile synthetic method for pristine graphene quantum dots and graphene oxide quantum dots: origin of blue and green luminescence.
abstract: Pristine graphene quantum dots and graphene oxide quantum dots are synthesized by chemical exfoliation from the graphite nanoparticles with high uniformity in terms of shape (circle), size (less than 4 nm), and thickness (monolayer). The origin of the blue and green photoluminescence of GQDs and GOQDs is attributed to intrinsic and extrinsic energy states, respectively.
authors.affiliation: Department of Chemical and Biomolecular, Engineering (BK21 program) and Institute for the BioCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Fei
authors.initials: F
authors.lastname: Liu
authors.forename: Min-Ho
authors.initials: MH
authors.lastname: Jang
authors.forename: Hyun Dong
authors.initials: HD
authors.lastname: Ha
authors.forename: Je-Hyung
authors.initials: JH
authors.lastname: Kim
authors.forename: Yong-Hoon
authors.initials: YH
authors.lastname: Cho
authors.forename: Tae Seok
authors.initials: TS
authors.lastname: Seo
keywords: graphene oxide quantum dot; graphene quantum dot; graphite nanoparticels; monolayer; photoluminescence