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Coalescence and Collisions of Gold Nanoparticles

By Eduardo Pérez-Tijerina, Juan Martín Montejano-Carrizales, Joel Antúnez-García, Sergio Mejía-Rosales and Miguel José-Yacamán

Abstract

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

Topics: gold nanoparticles, coalescence, collisions, molecular dynamics, common neighbor analysis, Materials of engineering and construction. Mechanics of materials, TA401-492, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Technology, T, DOAJ:Materials, DOAJ:Technology and Engineering, Engineering (General). Civil engineering (General), TA1-2040, Microscopy, QH201-278.5, Descriptive and experimental mechanics, QC120-168.85
Publisher: MDPI AG
Year: 2011
DOI identifier: 10.3390/ma4020368
OAI identifier: oai:doaj.org/article:1f2a7561369e44318de872c07fc4d6fa
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