Forming structures similar to or smaller than the optical wavelength offers a wide range of possibilities to modify the
optical properties of materials. Tunable optical nanostructures can be applied as materials for surface-enhanced
spectroscopy, optical filters, plasmonic devices, and sensors. In this work we present experimental results on technology
and properties of periodical, polymer based optical structures modified by ordered adsorption of silver nanoparticles.
These structures were formed combining UV hardening and dip coating from colloidal solutions. We have investigated
the influence of silver nanoparticles assembly on the ambient conditions (deposition temperature and time) and surface
features (periodicities and shape) of the template micro structures. Optical absorbance as well as morphology of the
structures containing silver nanoparticles were investigated by UV-VIS spectroscopy, AFM, SEM and optical
microscopy. The influence of silver nanoparticles on the optical properties of the structures was investigated by polarized
light spectroscopy (Grating Light Reflection Spectroscopy - GLRS). From the results of this study we propose a low cost
procedure for fabricating structures that could be potentially new type of plasmonic sensors exploiting surface enhanced
plasmon resonance in silver nano structures.
Silver nanoparticles have received considerable attention due to their attractive physical and chemical properties. The
surface plasmon resonance and large effective scattering cross section of individual silver nanoparticles make them ideal
candidates for molecular labeling, where phenomena such as surface enhance Raman scattering (SERS) can be
exploited. In addition, silver nanoparticles have recently been shown to be a promising antimicrobial material.
In the present research silver colloid was produced by sodium citrate reduction. The colloidal silver was incorporated by
dip-coating to the polymer substrate. X-Ray Fluorescence Spectroscopy (XRF), Atomic force microscopy (AFM),
ultraviolet-visible spectroscopy (UV-VIS ) and SERS indicate that the produced structures include metallic crystalline
silver nanoparticles. The surface plasmon resonance peak in absorption spectra of silver particles showed an absorption
maximum at 420-500 nm. The silver - polymer nanocomposites structures with selective light properties as a result of
plasmon resonance shifting in the UV-VIS wavelength region were produced.
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