The Effect of Double Doping with Copper and Tin on the Structural and Optical Properties of Nickel Oxide Nanoparticles Prepared by Sol-Gel Method. Acad. Sci. J. [Internet]. 2023 Oct. 1 [cited 2025 May 12];1(4):149-68. Available from: https://acadscij.uodiyala.edu.iq/index.php/Home/article/view/260