Novel Approaches of Nanoceria with Magnetic, Photoluminescent, and Gas-Sensing Properties

Abstract

The modification of CeO2 with rare-earth elements opens up a wide range of applications as biomedical devices using infrared emission as well as magnetic and gas-sensing devices, once the structural, morphological, photoluminescent, magnetic, electric, and gas-sensing properties of these systems are strongly correlated to quantum electronic transitions between rare-earth f-states among defective species. Quantitative phase analysis revealed that the nanopowders are free from secondary phases and crystallize in the fluorite-type cubic structure. Magnetic coercive field measurements on the powders indicate that the substitution of cerium with lanthanum (8 wt %), in a fluorite-type cubic structure, created oxygen vacancies and led to a decrease in the fraction of Ce species in the 3+ state, resulting in a stronger room-temperature ferromagnetic response along with high coercivity (160 Oe). In addition to the magnetic and photoluminescent behavior, a fast response time (5.5 s) was observed after CO exposure, indicating that the defective structure of ceria-based materials corresponds to the key of success in terms of applications using photoluminescent, magnetic, or electrical behaviors.

How the surface chemical properties of nanoceria are related to its enzyme-like, antiviral and degradation activity

“…Quite unique redox, 1,2 optical 3 and electronic properties, 4 high oxygen mobility, 5 interesting biological activity, 6 such as the ability to mimic functions of a wide variety of enzymes, 7,8 along with low cost, cerium abundance in the earth's crust (approximately as much as copper or zinc) and ease of preparation make nanoparticulate CeO 2 one of the most studied and utilized metal oxide-based nanomaterial. Due to the large number of synthetic procedures developed, the properties of engineered nanoceria particles, including surface chemical, opto-electronic, particle shape, size and size distribution, as well as behavior in biological systems and toxicity 9,10 vary significantly, which predetermines ceria applicability in very diverse areas 11,12 from industry to biomedicine.…”

Synthesis and defect characterization of hybrid ceria nanostructures as a possible novel therapeutic material towards COVID-19 mitigation

“…In this way, we can conclude that the distinct synthesis conditions (pH, temperature, and consequently pressure) reached during microwave irradiation are responsible for the creation of intrinsic defects that support the multi-functionality of the studied hybrid ceria nanostructures 76 ⁠ since their structural, morphological, photoluminescent, magnetic and electric properties are strongly correlated with the quantum electronic transitions between rare-earth f-states found in the defective species.…”

Synthesis of Ceria (CeO2) Nanoparticles and Their Application in Colorimetric Probes for the Determination of Ascorbic Acid

“…Reports from their study revealed that the earth-doped nanoceria shows a fast response time (5.5 s) towards CO conversion to CO 2 . [15] A point to consider when defining the application of nanoceria is its method of synthesis. Studies have demonstrated different methods for the synthesis of nanoceria for different applications.…”

“…has also shown that doping nanoceria with rare‐earth elements such as Lanthanum will help create oxygen vacancies and a decrease in Ce 3+ species on the surface of the nanoparticles, thus displaying magnetic, photoluminescent and gas sensing properties. Reports from their study revealed that the earth‐doped nanoceria shows a fast response time (5.5 s) towards CO conversion to CO 2 [15] …”