title: Facile preparation and upconversion luminescence of graphene quantum dots.
abstract: A facile hydrazine hydrate reduction of graphene oxide (GO) with surface-passivated by a polyethylene glycol (PEG) method for the fabrication of graphene quantum dots (GQDs) with frequency upconverted emission is presented. And we speculate on the upconversion luminescence due to the anti-Stokes photoluminescence (ASPL), where the δE between the π and σ orbitals is near 1.1 eV.
authors.affiliation: Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, China.
authors.forename: Jianhua
authors.initials: J
authors.lastname: Shen
authors.forename: Yihua
authors.initials: Y
authors.lastname: Zhu
authors.forename: Cheng
authors.initials: C
authors.lastname: Chen
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Yang
authors.forename: Chunzhong
authors.initials: C
authors.lastname: Li
mesh_terms: D006108:Graphite / Q000737:chemistry*; D006834:Hydrazines / Q000737:chemistry; D010084:Oxidation-Reduction; D011092:Polyethylene Glycols / Q000737:chemistry; D045663:Quantum Dots; D011789:Quantum Theory; D013056:Spectrophotometry, Ultraviolet
chemical_list: D006834:Hydrazines; C029424:hydrazine; D011092:Polyethylene Glycols; D006108:Graphite