dissertation aims to:

1. Prepare nano composite of TiO₂: CdS thin films NS using the sol-gel technique and dipping method on glass substrates and study their structural, surface morphology, and optical properties.
2. Prepare nano composite of CdS: TiO₂ Thin films NS on glass substrates for photocatalytic purposes to remove methyl red and blue dyes from water.
3. Deposit gold as island- like on the surfaces of the two prepared films using plasma sputtering and study its effect on the efficiency of the photocatalytic process.

dissertation also includes the synthesis and characterization of Au/TiO₂​:CdS and Au/CdS:TiO₂ nano composite   thin  films   for  photocatalytic applications. The structural, morphological, chemical  and optical properties of the nanoparticles were studied using several examinations (XRD, AFM, FE-SEM, EDX, RS, UV-VIS).

: The most important recommendations which the study has come up with and the average obtained.

1. Study the effect of adding other ceramic materials for TiO₂ and CdS on photocatalysis.
2. A study of prepared powder from the two composites accredited in this study and compared the degradation efficiency of the thin film and powder.
3. Study the addition of gold as a doping of the TiO₂:CdS film and its effect on the degradation organic dye.
4. Study the use of Ag or Cu instead of gold and its effect on the photocatalysis