  Crystalline nanoparticles of cadmium iodide where suspended in the amorphous
matrix of antimony trisulphide. Both materials are layered structured and have
large band-gaps however cadmium iodide exhibits polytypism, i.e. it exists in
various different crystalline states. Different crystalline states are marked
by wholely different dielectric constants which give rise to sharp surface
plasmon resonance (SPR) peaks in the UV-visible. The manuscript details the
variation in SPR's with heat-treatment of the films.

Materials Science