Simulación computacional de la generación de nanoparticulas bimetálicas

O. A. OVIEDO, N. A. OLDANI, S. A. DASSIE, M. M. MARISCAL AND E. P. M. LEIVA

Bariloche, Argentina

Otro; VIII Encuentro CNEA sobre Superficies y Materiales Nanoestructurados; 2008

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mso-ansi-font-size:26.0pt; mso-bidi-font-size:26.0pt; font-family:"Cambria","serif"; mso-ascii-font-family:Cambria; mso-ascii-theme-font:major-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:major-fareast; mso-hansi-font-family:Cambria; mso-hansi-theme-font:major-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:major-bidi; color:#17365D; mso-themecolor:text2; mso-themeshade:191; letter-spacing:.25pt; mso-font-kerning:14.0pt;} .MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; font-size:10.0pt; mso-ansi-font-size:10.0pt; mso-bidi-font-size:10.0pt;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> Las nanopartículas metálicas (NPs) han recibido considerable atención en las últimas décadas, debido a sus novedosas propiedades mecánicas, ópticas, electrónicas y magnéticas diferentes a la de su constituyente masivo. Estas propiedades hacen de las NPs interesantes candidatos para la generación de nanoestructuras y/o circuitos nanoelectrónicos . En particular la modificación de la superficie por deposición de diferentes especies químicas (átomos metálicos) permite además alcanzar propiedades novedosas no observables con NPs puras, dando origen a la formación de varias estructuras bimetálicas (NPBs). En el presente estudio, diferentes NPs (Ag, Pt y Au) son usadas como semilla para la generación de diferentes estructuras. Se emplearon simulaciones de templado dinámico, para localizar los diferentes mínimos durante el crecimiento de las NPBs. Examinamos los fenómenos de nucleación y crecimiento a diferentes sobrepotenciales y su respuesta frente a  variables tales como naturaleza, forma y tamaño del sustrato.