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Materials 2011, 4(2), 368-379; doi:10.3390/ma4020368

Coalescence and Collisions of Gold Nanoparticles

1,5, 1,2,3,* , 1,3, 4 and 2
1 CICFIM, Facultad de Ciencias Físico-Matemáticas, Universidad Autónoma de Nuevo León, San Nicol´as de los Garza, N.L. 66450, Mexico 2 Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX 78249, USA 3 Centro de Innovación, Investigación y Desarrollo en Ingeniería y Tecnología (CIIDIT), Universidad Autónoma de Nuevo León, Apodaca, Nuevo León 66600, Mexico 4 Instituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, S.L.P. 48000, Mexico 5 Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, B.C. 22800, Mexico
* Author to whom correspondence should be addressed.
Received: 28 December 2010 / Revised: 21 January 2011 / Accepted: 27 January 2011 / Published: 28 January 2011
(This article belongs to the Special Issue Metal Nanoparticles)
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We study the assembling of small gold clusters subject to collisions and close contact coalescence by using molecular dynamics simulations to simulate events that occur typically in the sputtering process of synthesis. Our results support the notion that the kinetics of coalescence processes strongly determine the geometry and structure of the final particle. While impact velocities, relative orientations, and the initial shape of the interacting particles are unlikely to strictly determine the structural details of the newly formed particle, we found that high initial temperatures and/or impact velocities increase the probability of appearance of icosahedral-like structures, Wulff polyhedra are likely to be formed as a product of the interactions between nanospheres, while the appearance of fcc particles of approximately cuboctahedral shape is mainly due to the interaction between icosahedra.
Keywords: gold nanoparticles; coalescence; collisions; molecular dynamics; common neighbor analysis
gold nanoparticles; coalescence; collisions; molecular dynamics; common neighbor analysis
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Antúnez-García, J.; Mejía-Rosales, S.; Pérez-Tijerina, E.; Montejano-Carrizales, J.M.; José-Yacamán, M. Coalescence and Collisions of Gold Nanoparticles. Materials 2011, 4, 368-379.

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