Stability of Supported Lead Nanoparticles: Five-Fold Twinned Pyramids versus Single Crystals - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry C Année : 2015

Stability of Supported Lead Nanoparticles: Five-Fold Twinned Pyramids versus Single Crystals

Résumé

Many metals adopt a face-centered cubic structure in their bulk form, but they often exhibit important structural and morphological deviations when confined to nanoscale or interacting with the environment. In this paper, the growth of lead nanoislands on silicon(111) has been investigated in ultrahigh vacuum for different evaporation conditions: temperature, flux, annealing time, and source or surface condition. Unexpected Pb icosahedral nanoparticles of a very large, tip to 100 rim, size have been revealed to grow on Si(111) substrate. The coexistence between these 5-fold twinned Pb pyramids and expected face-centered cubic (fcc) Pb single crystals has been investigated in situ by Scanning Tunneling Microscopy (STM) and ex situ by Scanning Electron Microscopy (SEM). We found that the growth of the Pb icosahedral particles only occurs when very high Pb diffusion conditions are met, with a high quality of the silicon surface and a purified lead source. The icosahedral pyramids have been observed to be more stable upon ripening at room temperature than fcc single crystals.
Fichier non déposé

Dates et versions

hal-01233570 , version 1 (25-11-2015)

Identifiants

Citer

Lise Serrier-Garcia, François Debontridder, Dominique Demaille, Tristan Cren, Dimitri Roditchev. Stability of Supported Lead Nanoparticles: Five-Fold Twinned Pyramids versus Single Crystals. Journal of Physical Chemistry C, 2015, 119 (22), pp.12651-12659. ⟨10.1021/acs.jpcc.5b00441⟩. ⟨hal-01233570⟩
61 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More