srjmdSRJMDSRJMD2788-9467https://doi.org/10.47310/srjmd.2025.v05i01.007Green Synthesis of Copper Oxide Nanoparticles Using Urtica Dioica Leaf ExtractManalJ. KhalifaDepartment of Physics, College of Science, Wasit University, IraqThis study examines the eco-friendly production of copper oxide nanoparticles (CuONPs) utilizing Urtica dioica (nettles) As a reducing and stabilizing agent, we use leaf extract. Optical and structural characterization was done on the synthesized CuONPs deposited on a glass substrate. It was confirmed by X-ray diffraction (XRD) analysis that the nanoparticles were crystalline with an estimated crystallite size of around 40 nm as calculated by use of Scherrer’s equation. Scanning Electron Microscopy (SEM) performed morphological analysis of the nanoparticles of 10-50 nm found in a non uniform distribution. Optical characteristics such as energy band gap were examined by UV-Vis spectroscopy and predicted to be 3.6 eV, indicating strong quantum confinement effect due to nanoscale particles size. The increased band gap provides opportunities for photocatalysis and optoelectronic usage of devices sensitive to UV.