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Proceedings Paper

Use of water-soluble PbS quantum dots as fluorescent probe in sensing copper(II)
Author(s): Ting Li; Nanxi Wang; Lijia Chen; Dawei Deng; Yueqing Gu
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Paper Abstract

In this paper, we report a new facile method for the synthesis of water-soluble PbS quantum dots (QDs), using dihydrolipoic acid (DHLA) as a stabilizer. The prepared QDs were characterized by optical techniques and high-resolution transmission electron microscopy (TEM). Next, these water-soluble luminescent PbS QDs were further used to detect copper (II). The obtained experimental results show that the fluorescence of the PbS QDs could be markedly quenched by Cu(II) whereas approximate concentrations of other physiologically relevant cations, such as Zn(II), Ca(II), Mg(II), Mn(II), Na(I) and K(I) etc., almost did not interfere with the fluorescence quenching progress of copper ions. Based on this, a simple and rapid method for Cu(II) determination was developed. Under optimal conditions, the response was linearly proportional to the copper(II) concentration in the range of 1 to 11.5x10-8 mol•L-1, with a correlation coefficient of 0.995. Hence, aqueous DHLA-stabilized PbS QDs may be a promising fluorescent probe in sensing copper(II) selectively.

Paper Details

Date Published: 9 November 2010
PDF: 8 pages
Proc. SPIE 7853, Advanced Sensor Systems and Applications IV, 78531C (9 November 2010);
Show Author Affiliations
Ting Li, China Pharmaceutical Univ. (China)
Nanxi Wang, China Pharmaceutical Univ. (China)
Lijia Chen, China Pharmaceutical Univ. (China)
Dawei Deng, China Pharmaceutical Univ. (China)
Yueqing Gu, China Pharmaceutical Univ. (China)

Published in SPIE Proceedings Vol. 7853:
Advanced Sensor Systems and Applications IV
Brian Culshaw; Yanbiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan; Lin Zhang, Editor(s)

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