期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 462, 期 -, 页码 216-222出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2015.10.008
关键词
Silver nanoparticles; Photoluminescence; Cobalt(II); Copper(II); L-Tyrosine
资金
- Universita di Catania (Progetti di Ricerca di Ateneo)
- European Commission [PONa3_00136]
Nanoparticles have been increasingly used as sensors for several organic and inorganic analytes. In this work, we report a study on the synthesis of novel highly fluorescent L-Tyr capped silver nanoparticles (AgNPs) and their use for the determination of metal ions. The AgNPs have been characterized by TEM, UV-Vis and Photoluminescence (PL) spectroscopy and dynamic light scattering (DLS) measurements and used for the quantitative determination of Co(II) and Cu(II) ions. In the L-Tyr capped AgNPs, the a-amino and a-carboxyl groups of the surface-confined amino acid can coordinate the entitled metal ions, giving rise to a decrease of the silver surface plasmon absorption, that is linearly correlated with the metal ions concentrations. The addition of Co(II) and Cu(II) solutions to the L-Tyr AgNPs also induces a paramagnetic quenching of the fluorescence in the PL spectra and the related Stern Volmer plots highlight a linear correlation over the whole concentration range for both metal ions, with a more pronounced effect for the copper(II) ion. (C) 2015 Elsevier Inc. All rights reserved.
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