Structural, Optical, Morphological and Dielectric Properties of Cerium Oxide Nanoparticles

Abstract

Cerium oxide (CeO 2 ) nanoparticles were prepared by the precipitation method. The average crystallite size of cerium oxide nanoparticles was calculated from the X-ray diffraction (XRD) pattern and found to be 11 nm. The FT-IR spectrum clearly indicated the strong presence of cerium oxide nanoparticles. Raman spectrum confirmed the cubic nature of the cerium oxide nanoparticles. The Scanning Electron Microscopy (SEM) analysis showed that the nanoparticles agglomerated forming spherical-shaped particles. The Transmission Electron Microscopic (TEM) analysis confirmed the prepared cerium oxide nanoparticles with the particle size being found to be 16 nm. The optical absorption spectrum showed a blue shift by the cerium oxide nanoparticles due to the quantum confinement effect. The dielectric properties of cerium oxide nanoparticles were studied for different frequencies at different temperatures. The dielectric constant and the dielectric loss of the cerium oxide nanoparticles decreased with increase in frequency. The AC electrical conductivity study revealed that the conduction depended on both the frequency and the temperature.

Sucrose‐nitrate auto combustion synthesis of Ce 0.85 Ln 0.10 Sr 0.05 O 2‐ δ (Ln = La and Gd) electrolytes for solid oxide fuel cells

“…The estimated value of the bandgap of the samples is smaller than the value (3.2 eV) reported for bulk CeO 2. The reduction (red‐shift) in the bandgap of CeO 2 has been attributed to the formation of some localized band between the valence (VB) and the conduction band (CB). Oxygen vacancies ( V O ) may create their own energy state between valence and the conduction band of CeO 2 .…”

Cerium oxide nanoparticles: green synthesis and biological applications

“…For example, NPs in polygonal, cube or rod shapes have sharp edges and could cause mechanical damage to cells. 7,65,66 Therefore, the effect of NP shape cannot be ignored for biological applications. As mentioned earlier, almost all the green methods of ceria synthesis that are mentioned herein have produced NPs with spherical morphology.…”

Novel Gd(OH)3, GdOOH and Gd2O3 Nanorods: Microwave-Assisted Hydrothermal Synthesis and Optical Properties

“…This method provides a simple and fast approach for the large-scale production of new emergent complex functional materials. In addition, it also enables the shape-controlled synthesis of micro-and/or nanomaterials at a lower cost, for their industrial exploitation with unprecedented capabilities in the new technologies [9][10][11][12][13][14] .…”