Issue 12, 2009
From the journal:

Analyst

Mercury(ii) sensing based on the quenching of fluorescence of CdS–dendrimer nanocomposites

Bruno B. Campos,a   Manuel Algarra,b   Beatriz Alonso,c   Carmen M. Casadoc  and  Joaquim C. G. Esteves da Silva*a  

* Corresponding authors

a Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua Campo Alegre 687, 4169-007 Porto, Portugal

b Centro de Geologia, Faculdade de Ciências da Universidade do Porto, Rua Campo Alegre 687, 4169-007 Porto, Portugal

c Departamento de Química Inorgánica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain

Abstract

A chemical sensor for mercury(II) (Hg(II)) was developed based on the quenching of the fluorescence of cadmium sulfide (CdS) quantum dots (QDs) coated with polypropylenimine tetrahexacontaamine dendrimer (DAB) generation 5, CdS–DAB nanocomposites. The synthesis and characterization of CdS–DAB nanocomposites by means of EDXA, SEM and steady state luminescence is described. Macroscopic spherical structures are observed by electronic microscopy and the wavelength for the maximum fluorescence emission occurs at 535 nm (excitation at 351 nm). Stern–Volmer plots show a linear response in the range of 1 × 10−6 to 1 × 10−5 M with a quenching constant (Ksv) of 1.5 × 105 M−1. A parallel factor (PARAFAC) analysis model confirmed that Hg(II) alone provokes quenching of the fluorescence. Cu(II) and Pb(II) also quench the fluorescence of CdS–DAB nanocomposites, with a Ksv = 1.9 × 105 M−1 and Ksv = 2.2 × 104 M−1, respectively, and Cd(II), Zn(II), Co(II) and Ni(II) have no effect. Ionic strength, in the range from 1.25 × 10−3 up to 2 M, provokes a shift in the wavelength of the maximum of the emission spectra, from 482 to 677 nm.

Graphical abstract: Mercury(ii) sensing based on the quenching of fluorescence of CdS–dendrimer nanocomposites

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Article information

DOI
https://doi.org/10.1039/B914302E
Article type
Paper
Submitted
16 Jul 2009
Accepted
30 Sep 2009
First published
08 Oct 2009

Analyst, 2009,134, 2447-2452

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Mercury(II) sensing based on the quenching of fluorescence of CdS–dendrimer nanocomposites

B. B. Campos, M. Algarra, B. Alonso, C. M. Casado and J. C. G. Esteves da Silva, Analyst, 2009, 134, 2447 DOI: 10.1039/B914302E

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