title: Tyrosine capped silver nanoparticles: A new fluorescent sensor for the quantitative determination of copper(II) and cobalt(II) ions.
abstract: 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 α-amino and α-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.
authors.affiliation: Dipartimento di Scienze Chimiche, Università degli Studi di Catania, Viale Andrea Doria 6, 95125 Catania, Italy.
authors.forename: Annalinda
authors.initials: A
authors.lastname: Contino
authors.affiliation: Dipartimento di Scienze Chimiche, Università degli Studi di Catania, Viale Andrea Doria 6, 95125 Catania, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Maccarrone
authors.affiliation: CNR-IMM, MATIS, Via S. Sofia 64, 95123 Catania, Italy.
authors.forename: Massimo
authors.initials: M
authors.lastname: Zimbone
authors.affiliation: Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Via S. Sofia 64, 95123 Catania, Italy.
authors.forename: Riccardo
authors.initials: R
authors.lastname: Reitano
authors.affiliation: Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Via S. Sofia 64, 95123 Catania, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Musumeci
authors.affiliation: Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Via S. Sofia 64, 95123 Catania, Italy.
authors.forename: Lucia
authors.initials: L
authors.lastname: Calcagno
authors.affiliation: Dipartimento di Scienze Chimiche, Università degli Studi di Catania, Viale Andrea Doria 6, 95125 Catania, Italy.
authors.forename: Ivan Pietro
authors.initials: IP
authors.lastname: Oliveri
keywords: Cobalt(II); Copper(II); Photoluminescence; Silver nanoparticles; l-Tyrosine