A fluorescence quenching method for determination of copper ions with cdte quantum dots

• YILIN WANG ^[1] ; JIANPING LU ^[1] ; ZHANGFA TONG ^[1] ; HAIFENG HUANG ^[1]
  1. [1] Guangxi University

     Guangxi University

     China

     
• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 54, Nº. 3, 2009, págs. 274-277
• Idioma: inglés
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• Resumen

  • 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.