International Journal of Nano Dimension (Int. J. Nano Dimens.) Synthesis and characterization of Iron Oxide, rare earth Erbium Oxide, and Erbium Oxide blended Iron Oxide nanocomposites for biomedical activity application Volume 14 (2023) Issue 1, January 2023 2024 03 03 Synthesis and characterization of Iron Oxide, rare earth Erbium Oxide, and Erbium Oxide blended Iron Oxide nanocomposites for biomedical activity application 10.22034/ijnd.2022.1964912.2170 EN Umadevi Palani Department of Physics, Arignar Anna Govt. Arts College, Cheyyar-604407, (Affiliated: Thiruvalluvar University, Vellore), Tamil Nadu (TN), India. Baskaran Iruson Department of Physics, Arignar Anna Govt. Arts College, Cheyyar-604407, (Affiliated: Thiruvalluvar University, Vellore), Tamil Nadu (TN), India. Sathyaseelan Balaraman Department of Physics, University College of Engineering Arni, Anna University Chennai, Arni-632326, TN, India. Senthilnathan Krishnamoorthy Department of Physics, VIT University, Vellore-632014, TN, India. 0000-0001-5870-9985 Manikandan Elayaperumal Department of Physics, Thiruvalluvar University, TVUCAS Campus, Thennangur, 604408, Tamil Nadu, India. Journal Article 2024 03 03 In this report, we intend to synthesize iron oxide (Fe2O3), erbium oxide (Er2O3), and a composite of erbium oxide/iron oxide (Er2O3/Fe2O3) nanoparticles (NPs) by a microwave irradiation technique. After the synthesis, we explore the various physicochemical properties of the sample with the help of various systematic characterization techniques. First, the prepared sample has been subjected to XRD for determining the crystal structure. Then, we confirm the functional groups of the sample with the help of FTIR. Further, we analyze the absorbance and the band gap with a UV-Vis spectrometer. Besides, we also investigate the microbial studies, namely, the anti-bacterial and the anti-fungal. Finally, we also analyze the response of human breast cancer cells when they are exposed to iron oxide (Fe2O3), erbium oxide (Er2O3), and a composite of erbium oxide/iron oxide (Er2O3/Fe2O3) nanoparticles (NPs) with MDA MB 231 by MTT assay.