Green Synthesis of MnO2 Nanoparticles with Aqueous Extract of Star Apple Leaves (Chrysophyllum cainito L.)Dewi Jalinan Izzah, Nazriati Nazriati and Sumari SumariE3S Web Conf., 481 (2024) 05003DOI: https://doi.org/10.1051/e3sconf/202448105003