A FLUORESCENCE QUENCHING METHOD FOR DETERMINATION OF COPPER IONS WITH CDTE QUANTUM DOTS

作者:Wang, Yilin*; Lu, Jianping; Tong, Zhangfa; Huang, Haifeng
来源:Journal of the Chilean Chemical Society, 2009, 54(3): 274-277.
DOI:10.4067/s0717-97072009000300015

摘要

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 lact that the fluorescence of the QDs could be quenched by Cu(2+), a simple and rapid method for Cu(2+) detection was proposed using L-cysteine-capped CdTe QDs as fluorescent probes. Under optimum conditions, the response showed linear proportion to the concentration of Cu(2+) between 20 to 300 mu g.L(-1). The detection limit was 9.3 mu g.L(-1). This method was successfully applied to the determination of trace copper in real samples.