Document Detail

Size-dependent electrochemiluminescence behavior of water-soluble CdTe quantum dots and selective sensing of l-cysteine.
MedLine Citation:
PMID:  19159779     Owner:  NLM     Status:  MEDLINE    
Water-soluble CdTe quantum dots (QDs) with five sizes (2.25, 2.50, 2.77, 3.12, and 3.26nm) were synthesized with the hydrothermal method. The electrochemiluminescence (ECL) of CdTe QDs was investigated in detail in air-saturated solution without adding foreign oxidant. It was found that the ECL of CdTe QDs displayed a size-dependent property. With the increasing in the particle size of the CdTe QDs, the ECL intensity was gradually increased, in addition, both ECL peak potentials and ECL onset potentials of CdTe QDs were shifted positively. Influences of some factors on the ECL intensity were investigated. Under the optimal conditions, the ECL intensity had a linear relationship with the concentration of l-cysteine (l-Cys) in the range from 1.3 x 10(-6) to 3.5 x 10(-5) molL(-1) (R(2) 0.996) with a detection limit of 8.7 x 10(-7) molL(-1) (S/N=3). The proposed method was applied to the determination of l-Cys in real samples with satisfactory results. Compared with previous reports, it has better selectivity for the determination of l-Cys.
Lijuan Hua; Heyou Han; Xueji Zhang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-10-19
Journal Detail:
Title:  Talanta     Volume:  77     ISSN:  1873-3573     ISO Abbreviation:  Talanta     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-01-22     Completed Date:  2009-02-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984816R     Medline TA:  Talanta     Country:  England    
Other Details:
Languages:  eng     Pagination:  1654-9     Citation Subset:  IM    
College of Science, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, PR China.
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MeSH Terms
Cadmium Compounds*
Cysteine / analysis*
Luminescent Measurements*
Quantum Dots*
Reg. No./Substance:
0/Cadmium Compounds; 1306-25-8/cadmium telluride; 13494-80-9/Tellurium; 52-90-4/Cysteine; 7732-18-5/Water

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