Structure Formation Features of Poly--xylylene – Cadmium Sulphide Nanocomposite Films

The films of polymer nanocomposites based on poly--xylene containing cadmium sulfide (CdS) as a filler were studied by X-ray diffraction and IR spectroscopy. The films were synthesized by gas-phase polymerization on the surface by joint vapor deposition of -xylene monomer and CdS, had thicknesses of ~0.2, ~0.5, ~1 and ~1.5 μm, and contained from 5 to 90 vol. % of CdS. It is shown that in such films, depending on their thickness and filler content, CdS nanoparticles can be both X-ray amorphous and crystalline oriented with wurtzite-type structure (size ~30 nm) or with RCP structure (size ~9 nm). The polymer matrix in the vast majority of films is X-ray amorphous and yet oriented in some films. Oxygen-containing compounds are identified in many films, which appear to be formed as a result of partial oxidation of the films when they are exposed to air after synthesis. Possible influence of these compounds on the structure formation of CdS nanoparticles is discussed.