Hits:

Indexed by:会议论文

Date of Publication:2012-10-12

Included Journals:EI、CPCI-S、Scopus

Volume:610-613

Page Number:1060-+

Key Words:CdTe quantum dots; Copper(II); Detection; Seawater

Abstract:The use of CdTe quantum dots (QDs) as fluorescent probes for detection of copper(1) in seawater was evaluated, and the relationship between the size of CdTe QDs and fluorescent response in seawater was investigated. The fluorescence intensity of CdTe QDs was quenched linearly as the concentration of copper(II) increased, and the quenching efficiency increased as the size of the CdTe QDs decreased. The smaller CdTe QDs (emission peak at 518 nm, average diameter of similar to 2.1 urn) achieved a detection limit of copper(1) of 0.48 mu g L-1 under optimal experimental conditions. No significant influence was found for pH in the range from 7.0 to 9.0 in seawater. In contrast, the emission maxima of the CdTe QDs exhibited a slight red shift and the intensity of fluorescence decreased significantly as salinity was increased. Based on the performance of CdTe QDs in this study, small CdTe QDs display enormous potential for detection of copper(II) in seawater.