OPTICALLY ACTIVE FILMS BASED ON AOT-STABILIZED SILVER ORGANOSOL

The composite films based on silver organosol stabilised with anionic surfactant (AOT or bis(2-ethylhexyl)sodium sulphosuccinate) were obtained by the dip-coating method on polystyrene substrates. The films exhibit a surface plasmon resonance signal due to the presence of silver nanoparticles localised in the stabiliser layer. The film formation process is concomitant with the development of silver chain aggregates characterised by an interparticle distance that exceeds the particle diameters. The formation of aggregates does not induce alterations in the optical properties of nanoparticles. The obtained films exhibit a plasmonic signal and no plasmonic delocalisation. Due to varying the number of substrate immersions in the sol, it allows one to change the functional properties of the obtained films (viz., roughness (from 9 ± 2 to 25 ± 4 nm), wettability (from 36 ± 6 to 53 ± 9°), the morphology, the thickness (from 585 ± 13 to 831 ± 28 nm) and surface plasmon resonance signal).