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Green Synthesis of Cobalt Oxide Nanostructures: Morphology, Optical and Magnetic Characterization

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Abstract

Synthesis of Co3O4 nanostructures with morphologies of nanoparticles and nanosheets were successfully achieved by reflux method in the presence of pyridinium based ionic liquids, N-butylpyridinium bromide [BuPy]Br and N-octylpyridinium bromide [OPy]Br. The ionic liquid plays an important role as reaction media and morphology template to control Co3O4 nanostructures. Different morphologies of Co3O4 nanostructures were obtained by changing the ratio of the NaOH to Co(NO3)2·6H2O. The structure, morphology, and properties of prepared Co3O4 nanostructures were characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), vibrating sample magnetometer (VSM) and UV-visible spectroscopy. SEM and X-ray powder diffraction results showed that the Co3O4 nanostructures were obtained with smaller crystallite sizes by using butyl pyridinium ionic liquid with a shorter alkyl side chain. The results of optical measurements illustrate the blue shift of the bandgap using ILs. Furthermore, the ferromagnetic behavior of Co3O4 nanostructures was confirmed in magnetic measurement by the presence of a hysteresis loop.

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ACKNOWLEDGMENTS

The authors thank the Department of Chemistry Islamic Azad University, Ahvaz Branch for supporting and helping to perform this research.

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Authors and Affiliations

  1. Department of Chemistry, Khuzestan Science and Research Branch, Islamic Azad University, 61555-163, Ahvaz, Iran

    M. Darband

  2. Department of Chemistry, Ahvaz Branch, Islamic Azad University, 61349-37333, Ahvaz, Iran

    M. Darband, E. Tahanpesar, R. Badri & H. Sanaeishoar

  3. Department of Chemistry, College of Science, Shahid Chamran University of Ahvaz, 61357-43169, Ahvaz, Iran

    R. Badri

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  1. M. Darband
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Correspondence to E. Tahanpesar.

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Darband, M., Tahanpesar, E., Badri, R. et al. Green Synthesis of Cobalt Oxide Nanostructures: Morphology, Optical and Magnetic Characterization. Russ. J. Inorg. Chem. 66, 2068–2076 (2021). https://doi.org/10.1134/S0036023621140114

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