14 Kavaz et al. Green Synthesized Metallic Oxide Nanomaterials for Diverse Applications NanoWorld Journal Review Article Open Access https://doi.org/10.17756/nwj.2022-096 Doga Kavaz 1, 2* , Huzaifa Umar 1, 2 , and Maryam Rabiu Aliyu 3   1 Cyprus International University, Bioengineering Department, 98258, Northern Cyprus via Mersin, Turkey 2 Cyprus International University, Biotechnology Research Center, 98258, Northern Cyprus via Mersin, Turkey 3 Cyprus International University, Department of Energy System Engineering, 98258, Northern Cyprus via Mersin, Turkey * Correspondence to: Doga Kavaz Cyprus International University Bioengineering Department, 98258 Northern Cyprus via Mersin 10 Turkey E-mail: dkavaz@ciu.edu.tr Received: January 05, 2022 Accepted: February 17, 2022 Published: February 21, 2022 Citation: Kavaz D, Umar H, Aliyu MR. Green Synthesized Metallic Oxide Nanomaterials for Diverse Applications. J Nanoworld 8(1) 14-22. Copyright: © Kavaz et al. is is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC-BY) (http:// creativecommons.org/licenses/ by/4.0/) which permits commercial use, including reproduction, adaptation, and distribution of the article provided the original author and source are credited. Published by United Scientific Group Abstract e increased demand for metal and metal oxide nanoparticles has led to large-scale manufacturing of these nanoparticles employing high-energy pro- cedures with diverse toxic solvents. is pollutes the environment, necessitating the use of environmentally acceptable "green" synthesis processes. Bio-resources, such as plants and plant products, bacteria, fungi, yeast, and algae, can be used to produce metal nanoparticles as an alternative. In comparison to other methods, "green" synthesis has low toxicity and is safer for human health and the environ- ment, making it the best method for creating metal and metal oxide nanoparticles. Considering metallic oxide nanomaterials as promising materials, we provide a comprehensive review of studies on the diverse application and green synthetic method of metallic oxide nanomaterials using biological materials as reducing agents and stabilizers. is study extensively reviews the recent research on the synthesis mechanism of zinc oxide, silver oxide, and gold oxide nanomaterials and their diverse applications. Keywords Green synthesis, Biogenic, Nanoparticles, Metal nanoparticles Introduction Currently, the scientific community is concerned with new challenges that are present in health and environmental areas. One cutting-edge area of explo- ration is nanotechnology, which holds great potential for diverse applications of nanoparticles, including novel fields of science and technology [1, 2]. Nanotech- nology refers to the synthesis and alteration of particles smaller than 100 nm. Nanoparticles (NPs) are used in medical sciences, particularly in drug delivery, imaging, and diagnosis [3, 4]. ey possess high surface-to-volume ratio due to their small size, which gives them very distinctive features [5, 6]. Researchers are planning to synthesize NPs and design nano-devices for future applications in the fields of medical sciences, environment, energy, information, communication, industry, and food technology [7, 8]. Green synthesis produces NPs for a minimal price with gentle strain, tem- perature, and pH that avoids the hurtful elements of their creation [9, 10]. Phy- tonanotechnology utilizes different parts of the plant, such as roots, stems, seeds, and leaves, in developing nanoparticles [11]. e green combination of various types of NPs comes from biomolecules (proteins, nutrients), plant extracts (fla- vonoids, terpenoids), and microorganisms (microbes, parasites, and yeast) [12]. ere is a huge need to develop better approaches utilizing green nanotechnology