Effect of Surface Structure on Heteroepitaxial Growth of Silver Nanoparticles on WO3 Thin Films

Ahmad Al Mohammad; Mohamad B. Alsous

doi:10.4028/www.scientific.net/AMR.324.137

Paper Titles

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Influence of Experimental Parameters on the Synthesis of Gold Nanoparticles by Electroless Deposition
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Effect of pH on the Structural and Magnetic Properties of Magnetite Nanoparticles Synthesised by Co-Precipitation
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Preparation and Characterization of Transparent Electrodes Based on CNT-s Doped Metal Oxides
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Effect of Surface Structure on Heteroepitaxial Growth of Silver Nanoparticles on WO₃ Thin Films
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Influences of Ball-Milling Time on Gas-Sensing Properties of ZnO-WO₃ Nanocomposites
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Investigation of the Formation Mechanisms of Pd Nanoclusters Produced Using a Magnetron Sputtering Source
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Effect of Oxygen and Water in the CO Photocatalytic Oxidation with TiO₂
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Promoting Effect of CeO₂ Addition on Activity and Catalytic Stability in Steam Reforming of Methane over Ni/Al₂O₃
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Effect of Surface Structure on Heteroepitaxial Growth of Silver Nanoparticles on WO₃ Thin Films

Abstract:

The effect of surface structures of annealed WO₃ thin films on heteroepitaxial growth of molecular beam epitaxy (MBE) deposited silver nanoparticles (Ag NPs) has been investigated. Hexagonal WO₃ (h-WO₃) and monoclinic WO₃ (m-WO₃) thin films were used in (1x1) stoichiometric forms. The structure, the density, the particle size and the morphology of Ag NPs on WO₃ films were determined by transmission electron microscope (TEM) and selected area electron diffraction (SAEC). Ag NPs on the m-WO₃ surface created the (111)Ag//(001)m-WO₃ interface without preferred orientations while the epitaxial relationships between Ag NPs and the h-WO₃ films were formed as (111)Ag//(0001)h-WO₃ and Ag[01-1]//[21-30]h-WO₃. It was observed that the particle density, the mean size and the size dispersion of Ag NPs were controlled by either atom diffusion or by particle migration on the substrates. The maximum cluster density method and the Lifethenz theory of Van der Waals energy were used to investigate the Ag NP morphology and Ag//WO₃ interface parameters at saturation particle density of NPs.