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Effect of Co dopant on structural, optical, and magnetic properties of CeO2 quantum dots

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Abstract

The present study discusses the synthesis and characterization of Co-doped CeO2 quantum dots obtained via the chemical precipitation technique. The crystalline nature, optical properties, nanostructure, and magnetic behavior of the prepared samples have been investigated using various experimental techniques. The face-centered cubic structure of the Co-doped CeO2 quantum dots was demonstrated by the structural confirmation. The crystallite size was observed to decrease from 10.11 to 5.84 nm when the cobalt dopant concentration increased from 0 to 6%. Optical analysis revealed a significant blue shift in the UV absorption spectrum from 246 to 220 nm, resulting in a bandgap increase from 5.04 to 5.64 eV. The photoluminescence analysis indicates that the added Co dopant decreased the emission intensity. The peak shift from 512 to 532 cm−1 in Fourier transform infrared spectra confirmed the cobalt ion doping. The displacement of the Raman peak from 462 to 441 cm−1 further confirmed the space group Fm\(\overline{3}\)m of CeO2. TEM images revealed that the CeO2 samples without Co were spherical, but those with Co were nanorods. Energy-dispersive x-ray spectrum and x-ray photoelectron spectra confirmed the Co dopant. The vibrating sample magnetometer study confirmed the magnetic transition from weak to strong ferromagnetic transition due to Co dopant. Electron spin resonance spectra established the ferromagnetic character of undoped and Co-doped cerium oxide quantum dots.

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Data Availability

The authors confirm that the data supporting the findings of this study are available with the corresponding author on reasonable request.

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Acknowledgements

The authors thank SAIF IIT(M)-Chennai for offering VSM and EPR analysis, STIC-Cochin for supplying TEM analysis, and SRM Institute of Science and Technology for XPS analysis reported in the present work.

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  1. Department of Physics, Government Arts College, Bharathidasan University, Karur, 639 005, Tamilnadu, India

    S. Mohanapriya, P. Priyadharshini, P. A. Shobika, M. Ponnar & K. Pushpanathan

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  1. S. Mohanapriya
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  2. P. Priyadharshini
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Contributions

S. Mohanapriya: synthesis of samples and writing—original draft. P. Priyadharshini: helped in characterization and conceptualization. P. A. Shobika: drawing graphs and crystal structure. M. Ponnar: validation of investigation. K. Pushpanathan: methodology, supervision, and manuscript correction and editing.

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Correspondence to K. Pushpanathan.

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Mohanapriya, S., Priyadharshini, P., Shobika, P.A. et al. Effect of Co dopant on structural, optical, and magnetic properties of CeO2 quantum dots. J Aust Ceram Soc 59, 459–480 (2023). https://doi.org/10.1007/s41779-023-00834-6

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