Role of substrate on nucleation and morphology of gold nanoparticles produced by pulsed laser deposition

V. Resta, C.N. Afonso, E. Piscopiello, G. Van Tendeloo

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Abstract

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.
Original languageEnglish
Article number235409
Pages (from-to)-
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number23
DOIs
Publication statusPublished - 9 Jun 2009
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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