Hardness and Elastic Modulus on Six-Fold Symmetry Gold Nanoparticles

Materials

Manuel Ramos¹  Luis Ortiz-Jordan²  Abel Hurtado-Macias³  Sergio Flores¹  José T. Elizalde-Galindo¹  Carmen Rocha²  Brenda Torres²  Maryam Zarei-Chaleshtori² 

[1]Departmento de Física y Matemáticas, Instituto de Ingenieríay Tecnología, UACJ, Avenida del Charro #450 Nte. Cd. Juárez, Chihuahua, C.P. 32312, Mexico

[2] E-Mails:

[3]Materials Research and Technology Institute, University of Texas at El Paso, 500 W. University Ave, El Paso TX 79968, USA

[4] E-Mails:

[5]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

[6] E-Mail:

关键词: nanoparticles;    gold;    HRTEM;    nanoindentation;    hardness;   

DOI  :  10.3390/ma6010198

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.