Thiolated DAB dendrimers and CdSe quantum dots nanocomposites for Cd(II) or Pb(II) sensing

• Type: Article in International Scientific Journal
• Date: 2012

Authors

algarra, m (Author) Other; campos, bb (Author) Other; alonso, b (Author) Other; miranda, ms (Author) FCUP; martinez, am (Author) Other; casado, cm (Author) Other; da silva, jcge (Author) FCUP

Journal

Title: Talanta

Vol. 88

Pages: 403-407

ISSN: 0039-9140

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 41 Citations

Scopus - 47 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-002-DWG

DOI: 10.1016/j.talanta.2011.11.007

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5