Journal
TALANTA
Volume 88, Issue -, Pages 403-407Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2011.11.007
Keywords
DAB dendrimer; Nanocomposite sensor; CdSe quantum dots; Thiolated DAB dendrimer; Cd(II); Pb(II)
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Funding
- Spanish Ministerio de Ciencia e Innovacion [CTQ2009-12332-C02-01]
- Fundacao para a Ciencia e a Tecnologia (FCT, Lisbon) [PTDC/QUI/71001/2006]
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Four different generation of thiol-DAB dendrimers were synthesized, S-DAB-G(x) (x = 1, 2, 3 and 5), and coupled with CdSe quantum dots, to obtain fluorescent nanocomposites as metal ions sensing. Cd(II) and Pb(II) showed the higher enhancement and quenching effects respectively towards the fluorescence of S-DAB-G(5)-CdSe nanocomposite. The fluorescence enhancement provoked by Cd(II) can be linearized using a Henderson-Hasselbalch type equation and the quenching provoked by Pb(II) can be linearized by a Stern-Volmer equation. The sensor responds to Cd(II) ion in the 0.05-0.7 mu M concentration range and to Pb(II) ion in the 0.01-0.15 mM concentration range with a LOD of 0.06 mM. The sensor has selectivity limitations but its dendrimer configuration has analytical advantages. (C) 2011 Elsevier B.V. All rights reserved.
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