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Effect of Co3+ substitution on the structural, optical, and room-temperature magnetic properties of SnO2 nanoparticulates

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Abstract

To investigate the contribution of cobalt in initiating room-temperature ferromagnetism in SnO2 nanocrystals, the structural, optical, and magnetic behaviors of Co-doped SnO2 nanoparticulates with different dopant concentrations were examined. The structures of the samples were confirmed to be tetragonal and the shift in diffraction peaks as well as reductions in lattice parameters confirmed the incorporation of Co3+ ions into the SnO2 lattice. The diffuse reflectance spectroscopy data reveal the augmentation of absorption to upper wavelength and a decrease in energy bandgap was also observed. Co-doped samples revealed room-temperature ferromagnetism with a small contribution of paramagnetic ordering, which disappears with increase in dopant concentration. An increase in the Co content leads to a rapid increase in the saturation magnetization of the system whereas the coercivity seems to be almost constant for all the Co-doped SnO2 nanoparticles. The ferromagnetic properties of the synthesized samples depend on the distribution of defects, nanometric size, as well as the surface diffusion of Co ions on the tin oxide nanoparticles.

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Acknowledgements

The authors are thankful to the management of Vellore Institute of Technology, Vellore, for their constant support and the characterization facilities provided. The authors are also thankful to SAIF, IIT Madras, for providing VSM measurements and STIC, CUSAT, for carrying out HRTEM/SAED analysis of the synthesized nanoparticles.

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Authors and Affiliations

  1. Materials Research Laboratory, Department of Physics, School of Advanced Sciences, Vellore Institute of Technology, Vellore, Tamilnadu, India

    Renu Rajan

  2. Materials Research Laboratory, Centre for Functional Materials, Vellore Institute of Technology, Vellore, Tamilnadu, India

    R. Ezhil Vizhi

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  1. Renu Rajan
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Correspondence to R. Ezhil Vizhi.

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Rajan, R., Vizhi, R.E. Effect of Co3+ substitution on the structural, optical, and room-temperature magnetic properties of SnO2 nanoparticulates. J Mater Sci: Mater Electron 32, 12716–12724 (2021). https://doi.org/10.1007/s10854-021-05906-6

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  • DOI: https://doi.org/10.1007/s10854-021-05906-6

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