Ibrahim, D. A., Usman, A., & Abubakar, A. D. (2026). Defect-Mediated Cobalt-Doped SnO₂ Nanostructures for Enhanced Visible-Light Photocatalytic Degradation. UMYU Scientifica, 5(1), 276-283. https://doi.org/10.56919/usci.2651.023