University of Kashan Journal of Nanostructures 2251-7871 3 2 2013 06 01 Spinel-Type Cobalt Oxide (Co3O4) Nanoparticles from the mer- Co(NH3)3(NO2)3 Complex: Preparation, Characterization, and Study of Optical and Magnetic Properties 199 207 5460 10.7508/jns.2013.02.008 EN S. Farhadi Department of Chemistry, Lorestan University, Khoramabad 68135-465, Iran A. Sepahdar Department of Chemistry, Lorestan University, Khoramabad 68135-465, Iran K. Jahanara Department of Chemistry, Lorestan University, Khoramabad 68135-465, Iran Journal Article 2014 05 18 In this paper, the mer-Co(NH3)3(NO2)3 complex was used as a new precursor for synthesizing spinel-type cobalt oxide nanoparticles (Co3O4NPs).Thermal decomposition of the complex at low temperature (175 °C) resulted in the Co3O4NPs without using expensive and toxic solvents or complicated equipment. XRD, FT-IR, SEM, EDX, and TEM were employed to characterize the product, and its optical and magnetic properties were studied by UV-visible spectroscopy and a VSM, respectively. FT-IR, XRD and EDS analyses confirmed the formation of single-phase Co3O4 with cubic structure. The lattice constant calculated from XRD peaks is 8.0650 Å. SEM and TEM images showed that Co3O4NPs have a sphere-like morphology with an average size of 19 nm. Optical spectrum of Co3O4NPs revealed the presence of two band gaps at 2.20 and 3.45 eV values, which in turn confirmed the semiconducting properties. The magnetic measurement of Co3O4NPs showed a weak ferromagnetic order at room temperature. https://jns.kashanu.ac.ir/article_5460_26bddbd160d302f7ccb4c025bf94183a.pdf