Title: Synthesis and optical properties of Au@Ag bimetallic nanoparticles

Authors: Xavier E. Guerrero-Dib, Ubaldo Ortiz-Mendez, Selene Sepulveda-Guzman, Oxana V. Kharissova, Domingo Ferrer-Luppi

Addresses: Programa Doctoral en Ingenieria de Materiales (PDIM), Facultad de Ingenieria Mecanica y Electrica, Universidad Autonoma de Nuevo Leon, Av. Universidad s/n. Ciudad Universitaria, San Nicolas de los Garza, Nuevo Leon, C.P. 66451, Mexico. ' Programa Doctoral en Ingenieria de Materiales (PDIM), Facultad de Ingenieria Mecanica y Electrica, Universidad Autonoma de Nuevo Leon, Av. Universidad s/n. Ciudad Universitaria, San Nicolas de los Garza, Nuevo Leon, C.P. 66451, Mexico. ' Programa Doctoral en Ingenieria de Materiales (PDIM), Facultad de Ingenieria Mecanica y Electrica, Universidad Autonoma de Nuevo Leon, Av. Universidad s/n. Ciudad Universitaria, San Nicolas de los Garza, Nuevo Leon, C.P. 66451, Mexico. ' Programa Doctoral en Ingenieria de Materiales (PDIM), Facultad de Ingenieria Mecanica y Electrica, Universidad Autonoma de Nuevo Leon, Av. Universidad s/n. Ciudad Universitaria, San Nicolas de los Garza, Nuevo Leon, C.P. 66451, Mexico. ' The Texas Materials Institute, The University of Texas at Austin, 1 University Station C0400, Building CPE 5.404, Austin, 78712-0231, Texas, USA

Abstract: Synthesis of Au, Ag monometallic, and Au-Ag bimetallic nanoparticles have been synthesised by successive reduction of metal salts with ascorbic acid on prefabricated seeds in the presence of cetyltrimethylammonium bromide (C₁₆H₃₃)N(CH₃)₃Br (CTAB), as a cationic surfactant, is presented in this paper. This coverage method for the prefabricated seeds is uniform, although in some cases deviations from a spherical shape are observed with the formation of nanorods or nanoprisms. Results using high-resolution STEM-XEDS elemental mapping suggest that the actual distribution of the two metals within the multilayer spheres may involve partial alloying of the metals.

Keywords: nanoparticles; transmission electron microscopy; TEM; multishell nanostructured particles; nanotechnology; cetyltrimethylammonium bromide; CTAB; cationic surfactants; nanorods; nanoprisms; metal alloying; synthesis; optical properties; gold; silver.

DOI: 10.1504/IJNP.2010.037139

International Journal of Nanoparticles, 2010 Vol.3 No.4, pp.367 - 377

Published online: 26 Nov 2010 *

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