ZnS:Mn nanoparticles functionalized by PAMAM-OH dendrimer based fluorescence ratiometric probe for cadmium

Bruno B Campos; Manuel Algarra; Ksenija Radotić; Dragosav Mutavdžić; Enrique Rodríguez-Castellón; José Jiménez-Jiménez; Beatriz Alonso; Carmen M Casado; Joaquim C G Esteves da Silva

doi:10.1016/j.talanta.2014.10.010

ZnS:Mn nanoparticles functionalized by PAMAM-OH dendrimer based fluorescence ratiometric probe for cadmium

Talanta. 2015 Mar:134:317-324. doi: 10.1016/j.talanta.2014.10.010. Epub 2014 Nov 24.

Authors

Bruno B Campos¹, Manuel Algarra², Ksenija Radotić³, Dragosav Mutavdžić³, Enrique Rodríguez-Castellón⁴, José Jiménez-Jiménez⁴, Beatriz Alonso⁵, Carmen M Casado⁵, Joaquim C G Esteves da Silva¹

Affiliations

¹ Centro de Investigação em Química, Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, Porto, Portugal.
² Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain. Electronic address: malgarra67@gmail.com.
³ Institute for Multidisciplinary Research, University of Belgrade, KnezaVišeslava 1, 11000 Beograd, Serbia.
⁴ Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain.
⁵ Departamento de Química Inorgánica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.

PMID: 25618674
DOI: 10.1016/j.talanta.2014.10.010

Abstract

We report a nanocomposite of ZnS:Mn quantum dots and a third generation PAMAM-OH dendrimer (ZnS:Mn@PAMAM-OH(G=3)) which was rationalized to be used as ratiometric nanosensor for Cd(2+) in aqueous solution. The nanoparticles exhibited a bright yellow-orange emission with peaks at 448 and 595 nm. The structure of ZnS:Mn was not changed after coupling with PAMAM-OH, which was evidenced by the analysis of the emission spectra of the compounds. The results confirm that the prepared fluorescence nanoparticles could selectively detect Cd(2+) in aqueous solution with a limit of detection of 24.34 μM and RSD 4.07%, obtained by using the ratio I448/I595. The method was applied to different water samples.

Keywords: Cadmium; Dendrimer; Quantum dots; Ratiometric sensor; ZnS:Mn(2+).