• Impact of hydrogenation on the structural, optical and dielectric properties of (Sb + Dy) co-doped TiO$_2$ nanoparticles

    • Fulltext


        Click here to view fulltext PDF

      Permanent link:

    • Keywords


      Sb/Dy co-doped TiO$_2$; colossal permittivity; electroceramic; hydrogenation of ceramics.

    • Abstract


      TiO$_2$ oxide nanoparticles co-doped with Sb/Dy ions were synthesized by a hydrothermal precipitation method. Some amount of the synthesized co-doped sample was hydrogenated at ${\sim}$550°C for 30 min. The samples were characterized by traditional methods: structural investigation by X-rays, an optical investigation by spectral diffuse reflectance and AC dielectric measurements. It was noticed that 3%-Sb/Dy co-doping induces growth of mixed (Anatase + rutile) TiO$_2$ phases. The different styles of doping of Sb$6{5+}$ and Dy$^{3+}$ ions into TiO$_2$ nanocrystallites can be utilized to produce core/shell construction for the creation of colossal permittivity (CP). Thus, the dielectric permittivity for Sb/Dy co-doped TiO$_2$ was found to be of order ${\sim}$10$^3$ at 1 kHz. The hydrogenation was found to reduce the CP by influencing the core/shell constructions as well as by the creation of a high density of itinerant electrons, which could be estimated by the optical measurements. This result is important from point of view of studying the influence of hydrogenation on the dielectric properties of nano-sized transparent conducting oxides. The created CP was explained, in the present work, within the framework of the core/shell model and doping mechanisms. Such important results will be useful for future work on using hydrogenation to support/reduce CP depending on the types of dopant ions.

    • Author Affiliations


      A A DAKHEL1

      1. Department of Physics, College of Science, University of Bahrain, P.O. Box 32038, Zallaq, Kingdom of Bahrain
    • Dates

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2022-2023 Indian Academy of Sciences, Bengaluru.