Department of Physics, College of Education for pure Sciences, Tikrit University, 34001, Tikrit, Iraq.

* Correspondence: nadimkh4@tu.edu.iq

To examine the impact of preparation medium pH on structural, optical, and photocatalytic capabilities, ZnO-Ag₂O hybrid nanostructured films were created using a solution-spray-deposition technique. XRD, SEM, EDX, UV-Vis absorbance, and transmittance spectroscopy were used to assess samples prepared at pH 7.5 and 9.5. Methylene Blue dye degradation under visible light was used to measure photocatalytic activity. The findings showed that the pH had a major impact on the films' efficiency and shape. In 60 minutes, the sample prepared at pH 9.5 exhibited better photocatalytic activity, achieving a removal efficiency of 32.1% compared with 24.5% for the sample prepared at pH 7.5. The improved crystallinity, uniform particle distribution, and ideal band alignment are responsible for the increased activity at pH 9.5. These results emphasize the crucial role of alkaline synthesis conditions in the development of ZnO-Ag₂O nanocomposites for environmental applications.