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Vliv teploty na plazmonické vlastnosti nanočástic
VOBRUBA, Jan
Nanoparticle-based thin films find the utilization in a wide range of applications, based on the unique properties of these nano-objects. If the metal nanoparticle is illuminated by the light with the correct wavelength, collective oscillations of electrons can be excited in the nanoparticle, which leads either to an enormous increase of electrical intensity near the nanoparticle and to significant optical absorption at a given wavelength. This phenomenon of localized surface plasmon resonance (LSPR) strongly depends on the material, shape, and amount of nanoparticles, but also on the optical properties of the surrounding environment. Nanoparticle surfaces can thus be used for the preparation of LSPR sensors or substrates for surface-enhanced Raman spectroscopy. In this work, silver nanoparticle films were prepared by magnetron sputtering, where a very small amount of material was deposited on the glass substrate, which resulted in the formation of nano-islands. The influence of deposition conditions on the optical properties of the resulting layers was studied. It is shown that both the depth of the LSPR peak and its position can be changed by variation of the deposition time and the heating temperature.
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