Resumo

MORALES, Jorge; MORAN, José; QUINTANA, María  e  ESTRADA, Walter. Synthesis and characterization of silver nanoparticles by sol-gel route from silver nitrate. Rev. Soc. Quím. Perú [online]. 2009, vol.75, n.2, pp.177-184. ISSN 1810-634X.

Silver nanoparticles colloids have been synthetized by sol-gel method. This synthesis consists in silver nitrate reduction by ethylene glycol in a process called polyol. The growth of the nanoparticles have been controlled by the steric stabilization of the colloid with polyvinilpyrolidone (PVP, M_w = 40 000). The silver nanoparticle size and structure was depending on the control of parameters such as: molar concentrations ratio of silver nitrate and PVP, temperature of reaction and the reflux time. Colloids have been characterized by UV-vis spectroscopy in the range from 300 to 1000 nm. The results show that the typical peak of surface plasmon resonance is formed at 400 - 450 nm indicating the formation of silver nanoparticles. The presences of silver nanoparticles of spherical shape with size among 20-40 nm were observed by Transmission Electronic Microscopy (TEM). Electron diffraction patterns confirmed that synthesized colloids contain metallic silver with a crystal structure face centered cubic FCC.

Palavras-chave : nanoparticles; silver; sol-gel; ethyleneglycol; polyol process; PVP.

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