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Influence of Merge CoDoping of Bi/Ni ions on the Structural, Optical, and Colossal Dielectric Properties of TCO Anatase TiO2 Nanoparticles: Impact of Post-annealing in Hydrogen Gas Atmosphere

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Abstract

A hydrothermal precipitation technique was used to synthesize TiO2 oxide nanoparticles doped with Bi/Ni ions. X-ray diffraction, diffuse reflection spectroscopy, and ac-dielectric measurements were used to investigate the mechanical, optical, and dielectric properties of the synthesized NPs powder. Using Bi/Ni ionic codoping, TiO2 NCs were constructed as core/shell nanostructures. A key contribution of this work was the creation of colossal permittivity (CP). Thus, the dielectric measurements show CP of magnitude ~ 5 × 106 at room temperature and frequency of 1 kHz that was reduced to 2.7 × 105 by the hydrogenation of the sample, which are much more than that of pristine TiO2. Within the framework of the core/shell model and doping mechanisms, CP was explained in detail. Additionally, hydrogenation was explained as a reduction in CP by increasing itinerant electron concentrations as a result of the strong catalyst power of dopant Ni2+ ions dissociating adsorbed hydrogen.

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Authors and Affiliations

  1. Department of Physics, College of Science, University of Bahrain, P.O. Box 32038, Manama, Kingdom of Bahrain

    H. Ashoor, A. A. Dakhel & Adnan Jaafar

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  1. H. Ashoor
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  2. A. A. Dakhel
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Ashoor, H., Dakhel, A.A. & Jaafar, A. Influence of Merge CoDoping of Bi/Ni ions on the Structural, Optical, and Colossal Dielectric Properties of TCO Anatase TiO2 Nanoparticles: Impact of Post-annealing in Hydrogen Gas Atmosphere. Trans Indian Inst Met 76, 3059–3064 (2023). https://doi.org/10.1007/s12666-023-02900-w

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