Preparation and analysis of PVP surface protected Ag nanoparticles

MARÍA VIRGINIA ROLDÁN; HORACIO TROIANI; MARA GRANADA; OSCAR A. DESANCTIS; NORA S. PELLEGRI

Rosario, Santa Fe, Argentina

Congreso; 10º Inter-American Congress of Electron Microscopy 2009 (CIASEM 2009) y 1º Congress of the Argentine Society of Microscopy (SAMIC 2009); 2009

Noble metal nanoparticles have been intensely investigated due to their amazing properties such as optical, catalytic and electric ones. These characteristics make them suitable for a variety of potential applications for several devices. Metallic silver particles in particular are technologically important because it shows unique properties normally related to noble metals besides other specific ones that can be controlled depending on the particles size, the size distribution and shape. Several methods have been reported for Ag nanoparticles synthesis, including physical and chemical methods in discrete or continuous media. In this work we present a chemical reduction method of AgNO3 in ethanol to prepare silver nanoparticles of several shapes with PVP as surface modifier. We studied the influence of different parameters in the preparation method over the size and shape of the nanoparticles: surface modifier, reagents concentration, processing time, irradiation time. Finally we show the morphological and structural characterization of the nanoparticles by UV-visible spectroscopy, AFM and TEM.