Beilstein J. Nanotechnol.2020,11, 1608–1614, doi:10.3762/bjnano.11.143
between gold and silver (Figure 7). HAADF and EDS-STEM image analysis revealed that the column was mainly constituted of gold surrounded with silver. This suggests that the migration of silver to the upper surface might have resulted from a grain-boundary diffusion mechanism. Indeed, in thin films silver
diffusion happens either in volume (bulk diffusion) or through a grain boundary mechanism (short circuit diffusion) [22]. The latter is expected to be dominant as it exhibits a lower activation energy [23].
The following mechanism was proposed to explain the different steps of the oxidation process (Figure
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Figure 1:
Schematic showing the procedure used in this work to study the oxidation of Au/Ag thin films by rad...
Beilstein J. Nanotechnol.2020,11, 141–146, doi:10.3762/bjnano.11.12
metal nanoparticles. A simple method employing sol–gel coating of nanoparticles with titania followed by controlled silverdiffusion was developed and applied for the synthesis of Ag-modified hollow TiO2 spheres. The morphology of the synthesized structures and their chemical composition was
fabrication step. The synthesized nanostructures exhibit a broadband optical absorption in the UV–vis range.
Keywords: core–shell nanostructures; hollow spheres; silverdiffusion; silver-modified titanium dioxide; titania; Findings
In recent years, nanometer- to micrometer-sized inorganic hollow spheres
silverdiffusion in Ag–TiO2 core–shell nanostructures (CSNs). Our approach comprises three simple steps starting from the synthesis of the metallic core, through its coating with titania and finally annealing leading to plasmonic hollow nanostructures with plasmon resonance in a broad spectral range. SEM
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Figure 1:
Formation of Ag-modified TiO2 HSs (top) and SEM images showing Ag–TiO2 nanostructures at different ...