title: One-step synthesis of graphitic carbon nitride nanosheets with the help of melamine and its application for fluorescence detection of mercuric ions.
abstract: A facile, simple, and relatively environment-friendly hydrothermal approach was developed for one-step synthesis of graphitic carbon nitride nanosheets (GCNNs) using melamine and sodium citrate as the precursors. The prepared GCNNs emit strong fluorescence with a high quantum yield of 48.3%. The GCNNs were then characterized by various techniques including transmission electron microscopy, atomic force microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and UV-Vis absorption spectroscopy. In addition, the fluorescence quenching behavior of the GCNNS by mercuric ions (Hg2+) was exploited to fabricate a label-free fluorescence quenching sensor for sensitive and selective detection of Hg2+. The results showed that there existed a linear relationship between the fluorescence intensity and the concentration of Hg2+from 0.001 to 1.0μM with a detection limit of 0.3nM. Finally, the sensor was successfully used to detection of Hg2+in water and milk samples.
authors.affiliation: College of Chemistry, Nanchang University, Nanchang 330031, China.
authors.forename: Qianfen
authors.initials: Q
authors.lastname: Zhuang
authors.affiliation: College of Chemistry, Nanchang University, Nanchang 330031, China.
authors.forename: Liming
authors.initials: L
authors.lastname: Sun
authors.affiliation: College of Chemistry, Nanchang University, Nanchang 330031, China; State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China. Electronic address: ynni@ncu.edu.cn.
authors.forename: Yongnian
authors.initials: Y
authors.lastname: Ni
mesh_terms: D000818:Animals; D060326:Chemistry Techniques, Synthetic; D006108:Graphite / Q000737:chemistry*; D055772:Green Chemistry Technology; D057230:Limit of Detection; D008628:Mercury / Q000032:analysis* / Q000737:chemistry; D008892:Milk / Q000737:chemistry; D008958:Models, Molecular; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology; D009570:Nitriles / Q000138:chemical synthesis / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013997:Time Factors; D014227:Triazines / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D009570:Nitriles; D014227:Triazines; D014867:Water; C011206:cyanogen; D006108:Graphite; D008628:Mercury; C011907:melamine
keywords: Fluorescence detection; Graphitic carbon nitride; Melamine; Mercuric ions; Nanosheets