期刊
JOURNAL OF LUMINESCENCE
卷 207, 期 -, 页码 273-281出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2018.11.033
关键词
Rhodamine B assisted graphene quantum dots; Fluorescence sensor; High sensitivity; Fluorescence quenching; Mercury ions
类别
资金
- Department of Science and Technology of Yunnan Province [2017FA025]
- National Natural Science Foundation of China [61761047, 41876055]
- Program for Innovative Research Team (in Science and Technology) in University of Yunnan Province
Water-soluble rhodamine B assisted graphene quantum dots (RhB-GQDs) were synthesized by a facile one-pot hydrothermal method, using rhodamine B and ethylenediamine as nitrogen source. The as-synthesized RhB-GQDs have few layers configuration with an average size of 4.5 nm and good distribution. The fluorescence quenching approach was applied to the sensing of mercury ions in water. Rodamine B absorb on the surface of RhB-GQDs, and it can prevent RhB-GQDs from contacting with interfering cations. The presence of N atoms reduces the ability of interfering cations to form stable complex with carboxyl groups, and gives the RhB-GQDs good selectivity to mercury ions. In the case of low concentration, the fluorescence quenching efficiency of as-synthesized RhB-GQDs still has a good liner relationship with concentration. Due to the strong affinity of Hg2+ to amino and carboxyl on the surface of RhB-GQDs, the fluorescence of RhB-GQDs is quenched by nonradiative electron transfer between Hg2+ and the excited state of RhB-GQDs. Based on the fluorescence turn off process, the as-synthesized RhB-GQDs can be served as fluorescent platform for the sensitive and selective detection of Hg2+ with a detection limit of 0.16 nM.
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