Affiliation:
1. Department of Physics, College of Science, The University of Bahrain, P.O. Box 32038, Zallaq, Kingdom of Bahrain
Abstract
Introductions:
TiO2 nanoparticles ceramic (NPs) codoped with Bi and W ions have
been synthesized by a hydrothermal technique. A portion of the prepared ceramic was posthydrogenated.
Ceramic NPs were characterized by traditional methods. Crystalline structures and
optical properties were investigated using X-Ray diffraction (XRD) and diffuse reflection spectroscopy,
respectively.
Methods:
The present work has focused on the creation of a colossal (giant) dielectric permittivity
(GP) behavior with the TiO2 host NCs through the Bi/W codoping to construct electronic core/shell
structures. In addition, the influence of post-hydrogenation on the created GP was also examined.
Results:
It was found a high permittivity of 3.69×104 at 1 kHz, which was reduced to 3.29×104
by the hydrogenation of the sample. This is attributed to the densification of the itinerant electrons
by the effect of the catalytic power of the doping W5+ ions to dissociate the adsorbed H2.
Conclusion:
The present values of GP are much higher than the permittivity of the pure TiO2 and
the Bi-doped TiO2 ceramic, which was attributed to the construction of core/shell electronics structures.
As a result, the doping process has been studied in detail in relation to scientific expectations.
Publisher
Bentham Science Publishers Ltd.
Subject
General Materials Science