title: Preparation of graphene oxide and polymer-like quantum dots and their one- and two-photon induced fluorescence properties.
abstract: A simple, effective and green bottom-up method for the synthesis of highly fluorescent N doped graphene oxide quantum dots (GOQDs) and polymer-like quantum dots (PQDs) was developed on the basis of rapid one-step microwave assisted pyrolysis of citric acid (CA) and diethylenetriamine (DETA) in different reaction solvents. Both one-photon-induced and two-photon-induced photoluminescence (PL) properties of the resultant GOQDs and PQDs were characterized and analyzed. The one-photon-induced PL quantum yields (QY) of GOQDs and PQDs reached 39.8 and 74.0%, respectively, which are high enough to exhibit strong photoluminescence (PL) emission even under daylight excitation. The origin of the PL behavior and PL quenching mechanism was explored in terms of the interaction between the functional groups on the surfaces of GOQDs or PQDs and Hg(2+). Furthermore, due to the excellent selectivity and sensitivity of the GOQDs and PQDs to Hg(2+), the quantum dots might be used for quantitative detection of Hg(2+) in aqueous solution.
authors.affiliation: School of Chemical Engineering and Energy, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, P. R. China and Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, GD HPPC Lab, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China. cesrmz@mail.sysu.edu.cn ceszmq@mail.sysu.edu.cn.
authors.forename: Jia Jia
authors.initials: JJ
authors.lastname: Huang
authors.affiliation: Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, GD HPPC Lab, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China. cesrmz@mail.sysu.edu.cn ceszmq@mail.sysu.edu.cn.
authors.forename: Min Zhi
authors.initials: MZ
authors.lastname: Rong
authors.affiliation: Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, GD HPPC Lab, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China. cesrmz@mail.sysu.edu.cn ceszmq@mail.sysu.edu.cn.
authors.forename: Ming Qiu
authors.initials: MQ
authors.lastname: Zhang