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A novel fluorescent probe for H_2PO_4~- was designed and fabricated based on the carbon dots/Fe~(3+) composite. The carbon dots were synthesized by an established one-pot hydrothermal method and characterized by transmission electron microscope, X-ray diffractometer, UV-Vis absorption spectrometer and fluorescence spectrophotometer. The carbon dots/Fe~(3+) composite was obtained by aqueous mixing of carbon dots and FeCl_3, and its fluorescence property was characterized by fluorescence spectrophotometer. The fluorescence of carbon dots was quenched by aqueous Fe~(3+) cations, resulting in the low fluorescence intensity of the carbon dots/Fe~(3+) composite. On the other hand, H_2PO_4~- reduced the concentration of Fe~(3+) by chemical reaction and enhanced the fluorescence of the carbon dots/Fe~(3+) composite. The Stern-Volmer equation was introduced to describe the relation between the relative fluorescence intensity of the carbon dots/Fe~(3+) composite and the concentration of H_2PO_4~-, and a fine linearity(R2=0.997) was found in the range of H_2PO_4~- concentration of 0.4-12 m M.
A novel fluorescent probe for H_2PO_4 ~ was designed and fabricated based on the carbon dots / Fe ~ (3+) composite. The carbon dots were synthesized by an established one-pot hydrothermal method and characterized by transmission electron microscope, X-ray diffractometer The carbon dots / Fe ~ (3+) composite was obtained by aqueous mixing of carbon dots and FeCl_3, and its fluorescence property was characterized by fluorescence spectrophotometer. The fluorescence of carbon dots was quenched by (3+) cations, resulting in the low fluorescence intensity of the carbon dots / Fe ~ (3+) composite. On the other hand, H 2 PO 4 - reduced the concentration of Fe ~ (3+) by chemical reaction and enhanced the fluorescence of the carbon dots / Fe ~ (3+) composite. The Stern-Volmer equation was introduced to describe the relation between the relative fluorescence intensity of the carbon dots / Fe ~ (3+) composite and the concentration of H_2PO_4 ~ -, and a fine linearity (R2 = 0.997) was found in the range of H 2 PO 4 - concentration of 0.4-12 m.