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

The Analyst
B B CamposJ C G Esteves da Silva

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 x 10(-6) to 1 x 10(-5) M with a quenching constant (K(sv)) of 1.5 x 10(5) 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 K(sv) = 1.9 x 10(5) M(-1) and K(sv) = 2.2 x 10(4) M(-1), respectively, and Cd(II), Zn(II), Co(II) and Ni(II) have no effect. Ionic strength, in the range from 1.25 x 10(-3) up to 2 M, provokes a shift in the wavelength of the maximum of the emission spectra, from 482 to 677 nm.

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Citations

May 25, 2011·Journal of Fluorescence·João M M LeitãoJoaquim C G Esteves da Silva
Nov 21, 2012·Journal of Hazardous Materials·Prathik RoyHuan-Tsung Chang
Jan 31, 2014·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Yuqi ZhangLei Jiang
Nov 11, 2014·The Analyst·E SoršakA Lobnik
Feb 3, 2018·Analytical and Bioanalytical Chemistry·Gaozhi OuXiaojun Feng
Sep 29, 2019·Angewandte Chemie·Marta PachecoAlberto Escarpa
Jun 19, 2013·Physical Chemistry Chemical Physics : PCCP·Yuqi ZhangYanlin Song
Jul 26, 2013·Physical Chemistry Chemical Physics : PCCP·Somayeh Gholami, Mohsen Kompany-Zareh
Oct 9, 2020·Research : a Science Partner Journal·Dekai ZhouLongqiu Li

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