Zinc oxide nanoparticles (ZnO-NPs) have gained attention due to their distinctive properties and applications. In the current study, we developed an eco-friendly, economical, and green route for the synthesis of ZnO-NPs using the aqueous extract of the brown marine alga Cystoseira crinita (Fucales; Sargassaceae). ZnO-NPs were characterized by UV-Vis spectroscopy, transmission electron microscope (...