engleski

Optical and structural properties of silver nanoparticles in glass matrix formed by thermal annealing of field-assisted film dissolution

We study the formation of silver nanoparticles embedded in a glass matrix using a two-step procedure: i) the inclusion of silver ions in a glass matrix by electric field assisted dissolution of Ag film deposited on the glass and ii) the later aggregation of silver by thermal annealing. The optical properties of the sample, dominated by the surface plasmon resonance of metal nanoparticles in the visible spectral range, are studied by optical spectrosocopy. The structural characterization is carried out by grazing-incidence small-angle X-ray scattering measurements performed at Syncroton Elettra and silver depth profiles are characterized using Rutherford backscattering. By modification of the parameters of metal film dissolution (electric field, temperature and treatment time) the depth profile of Ag can be tailored. Variation of thermal annealing parameters (temperature and time) allows control on nanoparticles size. As result, the surface plasmon absorption intensity and line shape is changed, enabling the possibility to tune the sample optical properties.

metal nanoparticles; electric field assisted dissolution; surface plasmon resonance

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