Abstract
Abstract Cerium oxide nanoparticles have unique catalytic and oxygen storage capacity properties. In this work, the morphology and size of cerium oxide nanoparticles were experimentally and theoretically investigated. For the synthesis of nanoparticles, the laser ablation method was used. The analysis of the size and morphological characteristics of nanoparticles was performed using transmission electron microscopy. Using the method of molecular dynamics, we reveal the limiting dimensional transition from octahedral morphology to a spherical form in cerium oxide nanoparticles. The results obtained will be relevant for the controlled synthesis of nanostructured materials based on cerium oxide.
Highlights
Due to its unique properties, nanostructured cerium oxide is commonly used in solid oxide fuel cells [1] and as a catalyst [2]
The results of the analysis of TEM images show (Figure 1b) that an octahedral morphology is observed for ablated nanoparticles with sizes less than 23 nm, and a more spherical shape of particles is characteristic for sizes larger than 23 nm
Our calculations show that with an increase in the size of cerium oxide nanoparticles over 20 nm, spherical nanoparticles become more stable than the octahedral forms
Summary
Due to its unique properties, nanostructured cerium oxide is commonly used in solid oxide fuel cells [1] and as a catalyst [2]. One of the most promising methods for nanostructuring a substance, especially for obtaining nanoparticles, is laser ablation [16,17]. The advantage of this method is the possibility of obtaining metastable condensed phases due to the development of high-temperature gradients in the process of ultrafast heating and cooling of matter. When cerium oxide nanoparticles are obtained using laser ablation [21,22], there is a strong scatter in the particle sizes, and, in general, they are characterized by octahedral and spherical morphology [23,24]. The cerium oxide nanoparticles were produced by laser ablation; the analysis of the size and morphological characteristics of the nanoparticles was carried out using transmission electron microscopy. For size and morphological analysis, several TEM images (more than 10 images for each sample) were used and the data are subsequently summarized
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