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Article Dans Une Revue Nanoscale Année : 2013

Equilibrium shapes of supported silver clusters

Slavica Stankic
Robinson Cortes-Huerto
  • Fonction : Auteur
Nicoleta Crivat
  • Fonction : Auteur
Jacek Goniakowski
Jacques Jupille
  • Fonction : Auteur

Résumé

The morphology of silver nanoparticles supported on MgO smoke crystallites was studied by combining Transmission Electron Microscopy (TEM) and atomistic simulations of clusters of realistic size. Advantage was taken of the occurrence of well-defined complex MgO surfaces, including stepped surfaces and contact lines between stacked crystallites, to analyze Ag clusters of various orientations. Silver clusters were seen to adopt systematically the shape of a truncated octahedron irrespective of the support morphology. The (100) Ag//(100) MgO epitaxy was evidenced and (100), (111) and (110) facets were identified. The agreement between observed shapes and simulated profiles demonstrated that the formers were close to equilibrium which allowed the use of Wulff-Kaishew construction to determine the anisotropy ratios gamma 100/gamma 111 (1.03 +/- 0.03) and gamma 110/gamma 111 (1.08 +/- 0.03) and the Ag(100)/MgO(100) adhesion energy (0.58 +/- 0.10 J m(-2)) for clusters large enough to escape stress effects.
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Dates et versions

hal-01240522 , version 1 (09-12-2015)

Identifiants

Citer

Slavica Stankic, Robinson Cortes-Huerto, Nicoleta Crivat, Dominique Demaille, Jacek Goniakowski, et al.. Equilibrium shapes of supported silver clusters. Nanoscale, 2013, 5 (6), pp.2448-2453. ⟨10.1039/c3nr33896g⟩. ⟨hal-01240522⟩
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