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2009 | 115 | 3 | 679-684
Article title

Effect of Annealed (0001) α-Al_2O_3 Surfaces on Heteroepitaxial Growth of Silver Nanoparticles

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Languages of publication
EN
Abstracts
EN
The effect of annealed (0001) α -Al_2O_3 surfaces on heteroepitaxial growth of silver nanoparticles were analysed by reflection high-energy electron diffraction, transmission electron microscope and selected area electron diffraction. Ag nanoparticles were deposited on 1× 1 stoichiometric and reconstructed (111)Al//(0001) α -Al_2O_3 with the Knudsen cell. The maximum cluster density method and the Lifethenz theory of Van der Waals energy were used to investigate the Ag//(0001)α -Al_2O_3 interface parameters. The growth modes, lattice parameters, nanoparticle forms and sizes are strongly dependent on the substrate surface structures. Initially, three-dimensional islands of Ag nanoparticles grow on both kinds of surfaces with partial hexagonal shapes. Ag nanoparticles on stoichiometric surface create the (111)Ag//(0001)α -Al_2O_3 interface without any preferred epitaxial direction. On this surface, Gaussian distribution is characteristic of an atom-by-atom growth mode with density of Ag nanoparticles lower than saturation density while a coalescence growth mode appears due to binary collisions between Ag nanoparticles accompanied by a liquid-like behaviour after saturation density. In case of reconstruction substrates, the epitaxial relationships between Ag nanoparticles and the surface are formed (111)Ag//(0001)α -Al_2O_3, 〈01\bar(1)〉Ag//[12\bar(3)0]α -Al_2O_3 or 〈01\bar(1)〉Ag//[1\bar(1)00]α-Al_2O_3. The Ag nanoparticles make rotation with angles between ± 6° around the epitaxial orientations 〈1\bar(1)00〉 or 〈12\bar(3)0〉. Only the atom-by-atom growth mode were found at all Ag nanoparticles growth processes.
Keywords
Year
Volume
115
Issue
3
Pages
679-684
Physical description
Dates
published
2009-03
received
2008-03-27
(unknown)
2008-09-18
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv115n315kz
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