CENTRO DE TECNOLOGIA DE RECURSOS MINERALES Y CERAMICA
Unidad Ejecutora - UE
A simple and “green” technique to synthesize long-term stability colloidal Ag nanoparticles: Fs laser ablation in a biocompatible aqueous medium
ARBOLEDA, DAVID MUÑETÓN; FERNÁNDEZ VAN RAAP, MARCELA B.; SANTILLÁN, JESICA M.J.; TORRES SANCHEZ, ROSA M.; MURACA, DIEGO; SCHINCA, DANIEL C.; ARCE, VALERIA B.; FERNÁNDEZ, MARIELA A.; SCAFFARDI, LUCÍA B.
ELSEVIER SCIENCE INC
Lugar: Amsterdam; Año: 2018 vol. 140 p. 320 - 332
A comparative study of spectral characteristics, size distribution, composition, morphology and long-term stabilityof colloidal Ag NPs synthesized by ultrashort pulse laser ablation of a solid target and by chemical saltreduction, both in Trisodium Citrate (TSC) aqueous solution was carried out. Several techniques were independentlyused to characterize optical, structural and compositional properties of the colloidal samples. Bothsynthesis routes yield bare core Ag and Ag@Ag2O core@shell NPs, with size distributions of roughly similar sizecentered at about 1.2 nm radius. Stability analysis of samples was conducted for several weeks and after one-yearof fabrication, analyzing the characteristics of the plasmon resonance in the optical extinction spectra and independentlyby zeta potential measurements. For laser ablation colloids, plasmon peak reaches redshift saturationregime at the second week, while salt reduction colloids seem to reach saturation at times beyond oneyear. After one year, colloids synthesized by UPLA still show a clear single plasmon resonance in their opticalspectra together with higher negative zeta potential values, compatible with very good stability characteristicsand no signs of agglomeration. A suitable selection of laser pulse energy and citrate concentration may be usedfor tuning plasmon resonance peak position and FWHM for specific applications. The biocompatibility propertiesand good stability of the colloids generated by ?green? UPLA may boost its use as long-term antimicrobialadditive in films, antifungal paints and antibacterial composites.