Structural and optical characreterization of CdS nanorods

CdS films have been chemically deposited on glass substrates at room temperature at varying molarity from 0.05M ≤ x ≤ 0.2M by Chemical Bath Deposition technique. The study of crystallinity of the films by XRD, without annealing the films, is observed to improve with increasing molarity at 0.2M with particle size 10nm and prominent reflection along (200) plane in cubic Zinc blend structure. The SEM micrographs of the films at 0.1M and 0.2M show the formation of CdS nanorods with diameter within the range 471.2 – 668.7nm. The band gaps in the films are determined from UV absorption spectra which show lowering from the bulk value at 0.05M but increase above 2.4eV with increasing molarity. The absorption spectra shows blue shift at around 435nm wavelength.