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Materials 2013, 6(1), 198-205; doi:10.3390/ma6010198

Hardness and Elastic Modulus on Six-Fold Symmetry Gold Nanoparticles

1,2,* , 2
1 Departmento de Física y Matemáticas, Instituto de Ingenieríay Tecnología, UACJ, Avenida del Charro #450 Nte. Cd. Juárez, Chihuahua, C.P. 32312, Mexico 2 Materials Research and Technology Institute, University of Texas at El Paso, 500 W. University Ave, El Paso TX 79968, USA 3 Centro de Investigación en Materiales Avanzados S.C., Laboratorio Nacional de Nanotecnología-Chihuahua Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua, Apdo. Postal 31109, Mexico
* Author to whom correspondence should be addressed.
Received: 6 November 2012 / Revised: 20 December 2012 / Accepted: 6 January 2013 / Published: 14 January 2013
(This article belongs to the Special Issue Metal Nanoparticles 2012)
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The chemical synthesis of gold nanoparticles (NP) by using gold (III) chloride trihydrate (HAuCl∙3H2O) and sodium citrate as a reducing agent in aqueous conditions at 100 °C is presented here. Gold nanoparticles areformed by a galvanic replacement mechanism as described by Lee and Messiel. Morphology of gold-NP was analyzed by way of high-resolution transmission electron microscopy; results indicate a six-fold icosahedral symmetry with an average size distribution of 22 nm. In order to understand the mechanical behaviors, like hardness and elastic moduli, gold-NP were subjected to nanoindentation measurements—obtaining a hardness value of 1.72 GPa and elastic modulus of 100 GPa in a 3–5 nm of displacement at the nanoparticle’s surface.
Keywords: nanoparticles; gold; HRTEM; nanoindentation; hardness nanoparticles; gold; HRTEM; nanoindentation; hardness
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Ramos, M.; Ortiz-Jordan, L.; Hurtado-Macias, A.; Flores, S.; Elizalde-Galindo, J.T.; Rocha, C.; Torres, B.; Zarei-Chaleshtori, M.; Chianelli, R.R. Hardness and Elastic Modulus on Six-Fold Symmetry Gold Nanoparticles. Materials 2013, 6, 198-205.

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