Abstract
V-, Ce-, and Mn-doped NiO/rGO bilayer nanocomposite thin films were prepared by the sol–gel spin-coating method. The structural, optical, and magnetic properties of the thin films have been investigated by XRD, XPS, Raman, SEM, UV-visible spectra, photoluminescence (PL) spectra, and SQUID-VSM analysis. The XRD patterns revealed the polycrystalline nature of the NiO thin films and the rGO layering decreased the crystallite size. The binding energy of all the thin films have been calculated using XPS spectra, confirming the cubic structure of NiO. Raman spectra analysis revealed the presence of increased defects corresponding to rGO in the layered films. rGO layering changed the surface morphology of all the doped films. Higher transmittance values have been observed for all the NiO and rGO layered NiO thin films in the visible and IR regions. The layering and doping changed the band gap values significantly. A PL quenching was observed in the rGO layered undoped and doped NiO thin films. Analysis of the magnetic properties revealed the increased values of saturation magnetization and magnetic moment in the rGO layered thin films.
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Acknowledgments
N.R. Aswathy acknowledges junior research fellowship from the University of Kerala, Thiruvananthapuram. The authors also acknowledge RUSA, India, for providing sol-gel spin coating unit and UV-visible spectrophotometer for the completion of this research.
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All the authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Aswathy, and Vinod Kumar R. The first draft of the manuscript was written by Aswathy and corrected by Shree Renjini and Vinod Kumar. All the authors contributed to previous versions of the manuscript. All the authors read and approved the final manuscript.
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Aswathy, N.R., Vinod Kumar, R. & Nair, S.R. Effect of rGO Layering on the Structural, Optical, and Magnetic Properties of Sol–Gel Spin-Coated V-, Ce-, and Mn-Doped NiO Thin Films. JOM 76, 2352–2361 (2024). https://doi.org/10.1007/s11837-024-06490-w
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DOI: https://doi.org/10.1007/s11837-024-06490-w