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 function-ality 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.
Testa, G., Fontana, L., Venditti, I., & Fratoddi, I. (2016). Functionalized platinum nanoparticles with surface charge trigged by pH: Synthesis, characterization and stability studies. Beilstein Journal of Nanotechnology, 7, 1822–1828. https://doi.org/10.3762/bjnano.7.175