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Cd Se quantum dots(QDs) were synthesized using diphenylcarbazide(DL) to sequester QDs precursors(Cd~(2+)) in situ. Fluorescence(FL) analysis showed the successive synthesis of QDs could be realized by capping with DL and the binding between DL and Cd~(2+). The average QDs particle size was about 5-20 nm by high-resolution transmission electron microscopy(HRTEM). Fourier transform infrared(FT-IR) spectra showed that Cd Se QDs could be chemically bonded with DL. The formation of QDs-DL-Cr(Ⅵ) could lower the fluorescence intensity of QDs. In a certain concentration range, the fluorescence intensity and Cr(Ⅵ) concentration presented a linear relationship. As a result, this phenomenon could be used to determine the Cr(Ⅵ) concentration in the range of 0-24 ×10~(-6) mol· L~(-1).
CdSe quantum dots (QDs) were synthesized using diphenylcarbazide (DL) to sequester QDs precursors (Cd ~ (2+)) in situ. Fluorescence (FL) analysis showed the successive synthesis of QDs could be realized by capping with DL and the binding Between DL and Cd ~ (2+). The average QDs particle size was about 5-20 nm by high-resolution transmission electron microscopy (HRTEM). Fourier transform infrared (FT-IR) spectra showed that Cd Se QDs could be chemically bonded The formation of QDs-DL-Cr (VI) could lower the fluorescence intensity of QDs. In a certain concentration range, the fluorescence intensity and Cr (VI) concentration presented a linear relationship. As a result, this phenomenon could be used to determine the Cr (Ⅵ) concentration in the range of 0-24 × 10 -6 mol · L -1.