Abstract

RAMIREZ, Daniel  and  JARAMILLO, Franklin. Facile one-pot synthesis of uniform silver nanoparticles and growth mechanism. Dyna rev.fac.nac.minas [online]. 2016, vol.83, n.198, pp.165-170. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v83n198.48707.

Size controlled silver nanoparticles were obtained via chemical reduction using one-pot synthesis. Differently from other reported methods for silver nanoparticles, 1-octanol was used as both solvent and reduction agent, oleylamine and oleic acid acted as capping agents and silver nitrate was used as the metal precursor. Ultraviolet-visible and Raman spectroscopy were used to monitor the in situ growth of the nanoparticles and to corroborate the oxidation of the alcohol to caprylic acid. X-ray diffraction (XRD) and transmission electron microscopy (TEM) served to find the size and shape of the nanoparticles. It was found that the temperature used and the reagents proportions were appropriated to produce silver nanoparticles. A growth mechanism was proposed including the formation of silver carboxylates as an intermediate step of the reaction. As a systematic use of oleic acid, we could observe that a higher concentration of this capping agent led to smaller and more homogenous nanoparticles, less than 5nm in size.

Keywords : silver nanoparticles; nanoparticles growth; capping agents.

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