Fluorescence Response of Cysteamine Modified CdTe Quantum Dots to Co2+

Abstract

Abstract:

The cysteamine (CA) modified CdTe (CA-CdTe) quantum dots (QDs) with different particle sizes were prepared by hydrothermal method. And the fluorescence response of CA-CdTe QDs to Co2+ was measured and analysed. The results indicate that Co2+ can quench the fluorescence of CA-CdTe QDs, with the increase of Co2+ concentration, the fluorescence intensity of CA-CdTe QDs was gradually decreased. When Co2+ concentration is in the range of 0.3×10-5～33×10-5 mol•L-1, the Stern-Volmer quenching equation of the interaction between Co2+ and CA-CdTe QDs with particle size 3.60 nm is obtained, and the detection limit is 6.547×10-7 mol•L-1. The method of quantitative detection of Co2+ based on the CA-CdTe QDs fluorescence analysis method is simple, rapid, and with low detection limits, which provides a theoretical basis for detecting Co2+ in real water samples.

Key words: CdTe QDs, hydrothermal synthesis, fluorescence analysis, Co2+, detection

CLC Number:

O657.31

GAN Ting-Ting, ZHANG Yu-Jun, ZHAO Na-Jing, XIAO Xue, YIN Gao-Fang, SHI Chao-Yi. Fluorescence Response of Cysteamine Modified CdTe Quantum Dots to Co2+[J]. Journal of Atmospheric and Environmental Optics, 2013, 8(6): 422-427.

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