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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
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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Abstract

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 (CC BY 3.0).

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MDPI and ACS Style

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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