The relationship between optical characteristics and antibacterial performance of Mg0.97Cu0.03O nanoparticles

This study investigates the optical properties and antibacterial efficiency of Mg₀.₉₇Cu₀.₀₃O nanoparticles synthesized via a sol-gel method. The nanoparticles were characterized using UV-Vis spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, and antibacterial activity tests. FTIR analysis confirmed the presence of distinct functional groups, indicating successful incorporation of copper into the magnesium oxide matrix. UV-Vis spectroscopy revealed an optical bandgap (Eg) of 2.89 eV, highlighting a reduction in the bandgap due to copper doping, which enhances light absorption in the visible region. Antibacterial activity was evaluated against Staphylococcus aureus using the agar diffusion method, with the nanoparticles exhibiting a significant zone of inhibition (25 mm). The results suggest that doping MgO with copper not only modifies its optical properties but also enhances its antibacterial efficacy, making it a promising candidate for biomedical applications, UV-protective coatings, and photocatalysis. The multifunctionality of these nanoparticles underscores their potential in diverse fields requiring materials with tailored optical and antibacterial properties.