title: Functionalized platinum nanoparticles with surface charge trigged by pH: synthesis, characterization and stability studies.
abstract: In this work, the synthesis and characterization of functionalized platinum nanoparticles (PtNPs) have been investigated. PtNPs were obtained by a wet redox procedure using 2-diethylaminoethanethiol hydrochloride (DEA) as capping agent. By varying the Pt/thiol molar ratio, monodispersed and stable particles with diameters in the range of 3-40 nm were isolated. The amino functionality allows neutral particles to be obtained in basic water solution and positive charged nanoparticles in neutral or acidic water solution (pH 7-2), as confirmed by DLS and ζ-potential measurements. FTIR spectroscopy, FE-SEM, DLS and ζ-potential measurements confirmed the size and showed long term water stability (up to three months) of the colloidal system.
authors.affiliation: Department of Chemistry, University Sapienza of Rome, p.le Aldo Moro 5, 00185 Rome, Italy.
authors.forename: Giovanna
authors.initials: G
authors.lastname: Testa
authors.affiliation: Department of Chemistry, University Sapienza of Rome, p.le Aldo Moro 5, 00185 Rome, Italy.
authors.forename: Laura
authors.initials: L
authors.lastname: Fontana
authors.affiliation: Department of Chemistry, University Sapienza of Rome, p.le Aldo Moro 5, 00185 Rome, Italy.
authors.forename: Iole
authors.initials: I
authors.lastname: Venditti
authors.affiliation: Department of Chemistry, University Sapienza of Rome, p.le Aldo Moro 5, 00185 Rome, Italy.
authors.forename: Ilaria
authors.initials: I
authors.lastname: Fratoddi
keywords: functionalized platinum nanoparticles; pH responsive materials; synthesis of metal nanoparticles; thiol functionalization