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Título: | Role of substrate on nucleation and morphology of gold nanoparticles produced by pulsed laser deposition |
Autor: | Resta, Vincenzo CSIC ORCID; Afonso, Carmen N. CSIC ; Piscopiello, E.; Tendeloo, G. Van | Fecha de publicación: | 2009 | Editor: | American Physical Society | Citación: | Physical Review B - Condensed Matter and Materials Physics 79(23):235409 (2009) | Resumen: | This work compares the morphology of gold nanoparticles (NPs) produced at room temperature on single-crystalline (MgO nanocubes and plates) and amorphous (carbon/glass plates) substrates by pulsed laser deposition (PLD). The results show that similar deposition and nucleation rates (>5× 1013 cm-2 s-1) are achieved irrespective of the nature of the substrate. Instead, the shape of NPs is substrate dependent, i.e., quasispheres and faceted NPs in amorphous and single-crystalline substrates, respectively. The shape of the latter is octahedral for small NPs and truncated octahedral for large ones, with the degree of truncation being well explained using the Wulff-Kaichew theorem. Furthermore, epitaxial growth at room temperature is demonstrated for single-crystalline substrate. The large fraction of ions having energies higher than 200 eV and the large flux of species arriving to the substrate (1016 at. cm-2 s-1) involved in the PLD process are, respectively, found to be responsible for the high nucleation rates and epitaxial growth at room temperature. © 2009 The American Physical Society. | URI: | http://hdl.handle.net/10261/54131 | DOI: | 10.1103/PhysRevB.79.235409 | Identificadores: | issn: 1098-0121 |
Aparece en las colecciones: | (CFMAC-IO) Artículos |
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