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Updated: May 22, 2026
Compact Quantum Dots for Single-molecule Imaging
Published on: October 9, 2012
A near-infrared-emitting CdTe/CdS core/shell quantum dots-based OFF-ON fluorescence sensor for highly selective and
Rijun Gui1, Xueqin An, Hongjuan Su
1Department of Physical Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Meilong Road 130, Shanghai 200237, PR China. jacky_0538@163.com
Abstract:
A near-infrared-emitting CdTe/CdS core/shell quantum dots (QDs)-based photoluminescence (PL) sensor was designed and applied for highly selective and sensitive detection of Cd(2+). This sensor was based on a PL "OFF-ON" mode. First, the addition of ammonium pyrrolidine dithiocarbamate (APDC) led to remarked PL quenching of QDs. Second, PL of APDC surface modified QDs (QDs-APDC) was gradually restored with the each increment of Cd(2+) concentration. Experimental results showed that PL of QDs-APDC was near proportional upon the addition of Cd(2+) in the range from 0.1 to 2 μM with a good correlation coefficient of 0.9989. The limit of detection of this proposed method was 6 nM. Interferential experiments confirmed that this sensor of Cd(2+) was highly selective over other metal ions. To further investigate perfect analysis performance, this sensor was favorably utilized to determine Cd(2+) in tap water, river water and liposome solutions.
