title: Carbon-based dots co-doped with nitrogen and sulfur for high quantum yield and excitation-independent emission.
abstract: Helpful elements: A facile bottom-up method using citric acid and L-cysteine as a precursor has been developed to prepare graphene quantum dots (GQDs) co-doped with nitrogen and sulfur. A new type and high density of surface state of GQDs arises, leading to high yields (more than 70 %) and excitation-independent emission. FLQY = fluorescence quantum yield.
authors.affiliation: School of Chemical and Biomedical Engineering and Center for Advanced Bionanosystems, Nanyang Technological University, Singapore 637457, Singapore.
authors.forename: Yongqiang
authors.initials: Y
authors.lastname: Dong
authors.forename: Hongchang
authors.initials: H
authors.lastname: Pang
authors.forename: Hong Bin
authors.initials: HB
authors.lastname: Yang
authors.forename: Chunxian
authors.initials: C
authors.lastname: Guo
authors.forename: Jingwei
authors.initials: J
authors.lastname: Shao
authors.forename: Yuwu
authors.initials: Y
authors.lastname: Chi
authors.forename: Chang Ming
authors.initials: CM
authors.lastname: Li
authors.forename: Ting
authors.initials: T
authors.lastname: Yu
mesh_terms: D019343:Citric Acid / Q000737:chemistry*; D003545:Cysteine / Q000737:chemistry*; D005453:Fluorescence; D006108:Graphite / Q000737:chemistry*; D008422:Materials Testing; D009584:Nitrogen / Q000737:chemistry*; D045663:Quantum Dots; D013455:Sulfur / Q000737:chemistry*
chemical_list: D019343:Citric Acid; D013455:Sulfur; D006108:Graphite; D003545:Cysteine; D009584:Nitrogen
keywords: doped materials; graphene; nitrogen; quantum dots; sulfur