Resumen de A fluorescence quenching method for determination of copper ions with cdte quantum dots
Yilin Wang, Jianping Li, Zhangfa Tong, Haifeng Huang
CdTe quantum dots (QDs) were synthesized in aqueous medium by employing L-cysteine as a stabilizer. They exhibited high stability and moderate fluorescence quantum yield (12.5%), and were characterized by UV-vis absorption, fluorescence spectra, Fourier transform infrared spectrometry. Based upon the fact that the fluorescence of the QDs could be quenched by Cu2+, a simple and rapid method for Cu2+ detection was proposed using L-cysteine-capped CdTe QDs as fluorescent probes. Under optimum conditions, the response showed linear proportion to the concentration of Cu2+ between 20 to 300µg·L-1. The detection limit was 9.3µg·L-1. This method was successfully applied to the determination of trace copper in real samples.
