Effect of surrounding environment on atomic structure and equilibrium shape of growing nanocrystals: gold in/on SiO2 (Articolo in rivista)

Type
Label
  • Effect of surrounding environment on atomic structure and equilibrium shape of growing nanocrystals: gold in/on SiO2 (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s11671-007-9058-4 (literal)
Alternative label
  • Ruffino, F; Bongiorno, C; Giannazzo, F; Roccaforte, F; Raineri, V; Grimaldi, MG (2007)
    Effect of surrounding environment on atomic structure and equilibrium shape of growing nanocrystals: gold in/on SiO2
    in Nanoscale research letters (Print); SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ruffino, F; Bongiorno, C; Giannazzo, F; Roccaforte, F; Raineri, V; Grimaldi, MG (literal)
Pagina inizio
  • 240 (literal)
Pagina fine
  • 247 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 2 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR, IMM, I-95121 Catania, Italy; Univ Catania, MATIS CNR, INFM, I-95123 Catania, Italy; Univ Catania, Dipartimento Fis & Astron, I-95123 Catania, Italy (literal)
Titolo
  • Effect of surrounding environment on atomic structure and equilibrium shape of growing nanocrystals: gold in/on SiO2 (literal)
Abstract
  • We report on the equilibrium shape and atomic structure of thermally-processed Au nanocrystals (NCs) as determined by high resolution transmission electron microscopy (TEM). The NCs were either deposited on SiO2 surface or embedded in SiO2 layer. Quantitative data on the NCs surface free energy were obtained via the inverse Wulff construction. Nanocrystals inside the SiO2 layer are defect-free and maintain a symmetrical equilibrium shape during the growth. Nanocrystals on SiO2 surface exhibit asymmetrical equilibrium shape that is characterized by the introduction of twins and more complex atomic defects above a critical size. The observed differences in the equilibrium shape and atomic structure evolution of growing NCs in and on SiO2 is explained in terms of evolution in isotropic/anisotropic environment making the surface free energy function angular and/or radial symmetric/asymmetric affecting the rotational/translational invariance of the surface stress tensor. (literal)
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