期刊
TALANTA
卷 143, 期 -, 页码 205-211出版社
ELSEVIER
DOI: 10.1016/j.talanta.2015.05.063
关键词
Carbon nitride nanoparticles; Fluorescent probe; Quenching; Mercuric ions; Citric acid; Urea
资金
- Natural Science Foundation of Fujian Province [2012J06005]
- Education Bureau of Fujian Province of China [JK2011030, JA13195]
- College Students' Innovative and Entrepreneurial Training Program [20141040]
- Foundation of Fujian Provincial Bureau of Quality and Technical Supervision [fjqi2013109]
Hollow cross-linked fluorescent carbon nitride nanoparticles (CNNPs) were fabricated via a facile one-pot solvothermal process. The obtained CNNPs were characterized by multiple analytical techniques including transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), solid-state nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR). The excitation-dependent fluorescence emission spectra showed significant differences for the CNNPs derived from various proportions of citric acid monohydrate and urea. The fluorescence quantum yield of the obtained CNNPs could reach 31%. The CNNPs exhibited good fluorescence quenching selectivity to mercuric ions. Concentration experiments showed that there existed two parts of linear relationship between fluorescence intensity and concentration of Hg2+ ions in the range of 0.1-8 and 8-32 mu M. The limit of detection (LOD) was estimated to be 0.094 mu M. This method can be applied to the detection of Hg2+ ions in tap water samples. (C) 2015 Elsevier B.V. All rights reserved.
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