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On the Stiffness of Gold at the Nanoscale

Abstract: The density and compressibility of nanoscale gold (both nanospheres and nanorods) and microscale gold (bulk) were simultaneously studied by X-ray diffraction with synchrotron radiation up to 30 GPa. Colloidal stability (aggregation state and nanoparticle shape and size) in both hydrostatic and nonhydrostatic regions was monitored by small-angle X-ray scattering. We demonstrate that nonhydrostatic effects due to solvent solidification had a negligible influence on the stability of the nanoparticles. Conversely, nonhydrostatic effects produced axial stresses on the nanoparticle up to a factor 10× higher than those on the bulk metal. Working under hydrostatic conditions (liquid solution), we determined the equation of state of individual nanoparticles. From the values of the lattice parameter and bulk modulus, we found that gold nanoparticles are slightly denser (0.3%) and stiffer (2%) than bulk gold: V0 = 67.65(3) Å3 , K0 = 170(3)GPa, at zero pressure.

 Fuente: ACS Nano 2021, 15, 19128-19137

Editorial: American Chemical Society

 Fecha de publicación: 01/10/2021

Nº de páginas: 10

Tipo de publicación: Artículo de Revista

 DOI: 10.1021/acsnano.1c06947

ISSN: 1936-0851,1936-086X

Proyecto español: PGC2018-101464-B-I00 (MICINN/FEDER)

Url de la publicación: https://pubs.acs.org/doi/10.1021/acsnano.1c06947?goto=supporting-info&

Autores/as

SÁNCHEZ-IGLESIAS, ANA

JOSE ANTONIO BARREDA ARGÜESO

POLIAN, ALAIN

ITIÉ, JEAN-PAUL ITIÉ

PÉREZ, JAVIER

MULVANEY, PAUL

LIZ-MARZÁN, LUIS M.