Publicado

2016-09-01

Fácil síntesis en un paso y mecanismo de formación de nanopartículas de plata

Facile one-pot synthesis of uniform silver nanoparticles and growth mechanism

Palabras clave:

nanopartículas de plata, crecimiento, agentes estabilizantes (es)
silver nanoparticles, nanoparticles growth, capping agents (en)

Autores/as

  • Daniel Estiben Ramirez Universidad de Antioquia
  • Franklin Jaramillo Universidad de Antioquia
En este trabajo se obtuvieron nanoparticulas de plata por la ruta de reducción química usando síntesis en un paso. Diferente a otros métodos reportados para nanoparticulas de plata, se usó 1-octanol como solvente y agente reductor, oleilamina y ácido oleico como agentes estabilizantes, mientras que el precursor del metal fue nitrato de plata. El crecimiento de las nanopartículas fue monitoreado por espectroscopia de absorción ultravioleta-visible y Raman, lo cual corroboró la oxidación del alcohol a ácido caprilico. Los ensayos de difracción de rayos X y microscopia electrónica de transmisión permitieron conocer la forma y el tamaño de las nanopartículas. Se encontró que la temperatura y los reactivos empleados fueron apropiados para producir nanopartículas de plata. Se formaron carboxilatos de plata como un paso intermedio en la reacción. Finalmente, el incremento en la concentración de ácido oleico permitió la obtención de nanopartículas de plata de menos de 5nm.
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.

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