Optical and morphological properties of Au@Ag core-shell nanoparticles: Influence of different reducing agents

A. S. Merlano, F. R. Pérez, W. Silva, N. Escobar, L. M. Hoyos, A. Salazar

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    Resumen

    Colloidal suspensions of gold coated with silver core-shell nanoparticles in poly vinyl alcohol were prepared by the seed-mediated growth approach and a comparative study of optical and morphological properties was conducted. Two types of gold seeds were considered. For the first type, a strong reducing agent (NaBH4) and for the second one, a weak reducing agent (Na3C6H5O7) were used. Four volumes of AgNO3 solution were used to obtain silver coatings with different thicknesses. In each case, morphological and optical properties were investigated by transmission electron microscopy and ultraviolet-visible spectroscopy, respectively. Also, numerical calculations of optical absorption were performed with Matlab toolbox for the simulation of metallic nanoparticles, using a boundary element method approach. This study offers practical considerations useful as a route of synthesis at room temperature of this type of nanoparticles, in such a way that a good homogeneity and reproducibility can be achieved. Results here presented show practical details useful in the synthesis of this type of nanoparticles for applications such as catalysis.

    Idioma originalInglés
    Número de artículo012012
    PublicaciónJournal of Physics: Conference Series
    Volumen1547
    N.º1
    DOI
    EstadoPublicada - 18 jun. 2020
    Evento16th National Meeting on Optics, ENO 2019 and 7th Andean and Caribbean Conference on Optics and Its Applications, CANCOA 2019 - Monteria, Colombia
    Duración: 26 nov. 201930 nov. 2019

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