%0 Journal Article
%T Ultrasensitive Detection of Glyphosate Using CdTe Quantum Dots in Sol-Gel-Derived Silica Spheres Coated with Calix[6]arene as Fluorescent Probes
%A Tao Li
%A Yunyou Zhou
%A Junyong Sun
%A Kai Wu
%J American Journal of Analytical Chemistry
%P 12-18
%@ 2156-8278
%D 2012
%I Scientific Research Publishing
%R 10.4236/ajac.2012.31003
%X We have developed a simple method for the preparation of highly fluorescent and stable, water-soluble CdTe quantum dots in sol-gel-derived composite silica spheres which were coated with calix[6]arene. The resulting nanoparticles (NPs) were characterized in terms of UV, fluorescence and FT-IR spectroscopy and TEM. The results show that the new NPs display more intense fluorescence intensity and are more stable than its precursors of the type SiO2/CdTe. Under the optimum, the novel NPs exhibit a higher selectivity and ultrasensitive fluorescence probes for the determination of gly-phosate over other pesticides, the fluorescence intensity increase with the concentration of glyphosate in the range from 1.0 to 25.0 nmol/L and the detection limit is low to 0.0725 nmol/L. A mechanism is suggested to explain the inclusion process by a Langmuir binding isotherm.
%K Quantum Dots
%K SiO&lt
%K sub&gt
%K 2&lt
%K /sub&gt
%K /CdTe NPs
%K C[6]/SiO&lt
%K sub&gt
%K 2&lt
%K /sub&gt
%K /CdTe NPs
%K Glyphosate
%K Fluorescence Probes
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=16796