title: Nearly monodisperse graphene quantum dots fabricated by amine-assisted cutting and ultrafiltration.
abstract: We report a novel procedure involving polyethylenimine-assisted hydrothermal cutting and subsequent ultrafiltration for fabricating nearly monodisperse graphene quantum dots with a uniform lateral size and confined layer number. The isolated monolayer quantum dots exhibit a sharp band-edge absorption feature and strong photoluminescence (quantum yield of 21%) independent of excitation wavelength and pH. Their preliminary application in bioimaging has been demonstrated.
authors.affiliation: Institute of Nanochemistry and Nanobiology, Shanghai University, Shanghai, China. dypan617@shu.edu.cn.
authors.forename: Qi
authors.initials: Q
authors.lastname: Xue
authors.forename: He
authors.initials: H
authors.lastname: Huang
authors.forename: Liang
authors.initials: L
authors.lastname: Wang
authors.forename: Zhiwen
authors.initials: Z
authors.lastname: Chen
authors.forename: Minghong
authors.initials: M
authors.lastname: Wu
authors.forename: Zhen
authors.initials: Z
authors.lastname: Li
authors.forename: Dengyu
authors.initials: D
authors.lastname: Pan
mesh_terms: D002478:Cells, Cultured; D004847:Epithelial Cells / Q000166:cytology; D005753:Gastric Mucosa / Q000166:cytology; D006108:Graphite / Q000737:chemistry*; D006801:Humans; D057054:Molecular Imaging / Q000295:instrumentation / Q000379:methods*; D036103:Nanotechnology / Q000379:methods*; D045663:Quantum Dots / Q000737:chemistry*; D014462:Ultrafiltration
chemical_list: D006108:Graphite