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Rapidly Synthesis of Fluorescent Carbon Dots and Their Application in Hg~(2+) Detection

Water-solubility fluorescent carbon dots(CDs) containing surface carboxyl and hydroxyl were rapidly synthesized using glucose as the carbon source and hydrogen peroxide as the oxidative agent. CDs were characterized by FT-IR and fluorescence spectroscopy. The quantum yield of the fluorescent CDs was 6.29% as characterized by fluorescence spectroscopy analysis at the excitation wavelength of 310 nm. The emission spectra wavelength showed bathochromic-shift effect along with the increase of excitation wavelength. Fluorescence intensity of the fluorescent CDs solution was tested at different p H values. The results showed that the fluorescence intensity of CDs solution not dependent on the p H value. When the p H value was 8, the CDs solution had the maximum fluorescence intensity. Obvious fluorescence quenching phenomenon of the fluorescent CDs to Hg2+ was found through fluorescence spectra data analysis, demonstated that the fluorescent CDs could be used to detect Hg2+.