title: Quasi-noble-metal graphene quantum dots deposited stannic oxide with oxygen vacancies: Synthesis and enhanced photocatalytic properties.
abstract: Quasi-noble-metal graphene quantum dots (GQDs) deposited stannic oxide (SnO2) with oxygen vacancies (VOs) were prepared by simply sintering SnO2 and citric acid (CA) together. The redox process between SnO2 and GQDs shows the formation of oxygen vacancy states below the conduction band of stannic oxide. The produced VOs obviously extend the optical absorption region of SnO2 to the visible-light region. Meanwhile, GQDs can effectively improve the charge-separation efficiency via a quasi function like noble metal and promote the visible-light response to some degree. In addition, the samples calcinated at 450°C reveals the best performance because of its relatively high concentrations of VOs. What is more, the possible degradation mechanism has been inferred as extended visible-light response as well as raised charge-separation efficiency has also been put forward. Our work may offer a simple strategy to combine the defect modulation and noble metal deposition simultaneously for efficient photocatalysis.
authors.affiliation: College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China.
authors.forename: Bin
authors.initials: B
authors.lastname: Quan
authors.affiliation: College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.affiliation: Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, Sichuan 621900, PR China.
authors.forename: Yousong
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, Sichuan 621900, PR China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, Sichuan 621900, PR China.
authors.forename: Guangcheng
authors.initials: G
authors.lastname: Yang
authors.affiliation: College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China. Electronic address: gbji@nuaa.edu.cn.
authors.forename: Guangbin
authors.initials: G
authors.lastname: Ji
keywords: Graphene quantum dots; Oxygen vacancies; Photocatalytic properties; SnO(2); Visible-light response