This work compares the morphology of gold nanoparticles NPs produced at room temperature on singlecrystalline MgO nanocubes and plates and amorphous carbon/glass plates substrates by pulsed laser deposition PLD. The results show that similar deposition and nucleation rates 51013 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.
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