Near-Infrared Fluorimetric Determination of Copper(II) Ions Using CdHgTe Nanorods as Probe

作者：Yu Mingchuan; Jin Yingqiong; Qi Xin; Bao Linjun; Qian Zhangsheng; Zhu Changqing^*

来源：Chinese Journal of Chemistry, 2010, 28(7): 1165-1170.

DOI：10.1002/cjoc.201090202

• CdHgTe nanorods
• near-infrared
• fluorescence quenching
• copper(II) ion

Stable water-soluble CdHgTe nanorods with an emission wavelength at 722 nm, obtained by doping Hg2+ into CdTe nanorods, has been used as a near-infrared region (NIR) probe to investigate their interaction with copper(II) ions. A new fluorimetric method for the determination of copper(II) ions has been developed based on the quenching effect of copper(II) ions on the emission of CdHgTe nanorods. The mechanism studies show that an effective electron transfer from nanorods to the copper(II) ions occurred based on the coordination reaction between copper(II) ions and the carboxyl groups on the nanorods surface, which could be responsible for the emission quenching of CdHgTe nanorods. Under optimum conditions, the linear range of the calibration curve for the determination of Cu2+ is from 8.0x10(-9) to 1.0x10(-6) mol/L and the detection limit is 2.0x10(-9) mol/L. Owing to low background interference of NIR measurement, the proposed method displays relative high sensitivity and selectivity. Especially, some physiologically important cations almost do not interfere with the determination of Cu2+. The proposed method was also applied to the determination of trace Cu2+ in real aqueous samples with satisfactory results.

• 出版日期2010-7
• 单位安徽师范大学