Observation of structural, optical, electrical and magnetic properties of ternary copper-doped CeO2/GO/SrTiO3 nanocomposites

• Published in: Journal of materials science. Materials in electronics 2023-07, Vol.34 (20), p.1513, Article 1513
• Main Authors: Hossam, F., Elseman, Ahmed Mourtada, Rasly, M., Mahani, R. M., Sayed, S. A., Rashad, M. M.
• Format: Article
• Language: English
• Subjects: Cerium oxides; Characterization and Evaluation of Materials; Chemistry and Materials Science; Copper; Copper oxides; Ferromagnetism; Frequency ranges; Glycine; Graphene; Magnetic properties; Materials Science; Nanocomposites; Optical and Electronic Materials; Optical properties; Room temperature; Sol-gel processes; Strontium titanates; Ternary systems
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-023-10901-0

A ternary system involving copper-substituted ceria (Cu:CeO 2 ) 0.95− y (GO) y (SrTiO 3 ) 0.05 nanocomposite where the GO concentration (y) is varied between 0.15 and 0.30. The innovation of this work lies in the purposeful assembly of the nanocomposite using a grinding method, which was optimized through the individual fabrication of Cu-doped CeO 2 with different CuO concentrations. In the first, Cu-doped CeO 2 with various CuO concentrations ( x  = 0.0, 0.05, 0.1, 0.2, and 0.3) was first individually fabricated based on a sol–gel auto-combustion strategy to optimize the best ratio. The XRD profiles confirm the successful fabrication of cubic cerium (IV) oxide CeO 2 using glycine as a fuel at an annealing temperature of 400 °C for 2 h. AC conductivity was investigated for both Cu-doped CeO 2 and the ternary nanocomposite over a wide frequency range (10 –1 to 10 7  Hz) at room temperature. The conductivity showed lower values for CeO 2 doped with 0.05, 0.2, and 0.3 wt% CuO, whereas it showed its maximum values upon doping with 0.1 wt% CuO. Interestingly, the conductivity of graphene oxide–doped CeO 2 was 10 3 times higher than that of pure CeO 2 , i.e., it increased from 1.7 × 10 –6 to 2 × 10 –3 S/cm. The magnetic-field dependence of MS of the ternary Cu-doped CeO 2 /GO/SrTiO 3 nanocomposites showed a systematic increase in MS as the Cu 2+ ion content increased. This strengthens the ferromagnetism in our samples as Cu 2+ ion content increases.