Controlling luminescent and redox properties of nanoceria

According to the report at the meeting of the Presidium of the NAS of Ukraine, December 22, 2021

Abstract

The unique antioxidant and radioprotective properties of cerium oxide nanocrystals (СеО_2–х) in the biological environment has led to considerable attention to these nanocrystals of scientists from various fields. The influence of the defect structure on the mechanisms of antioxidant activity of nanocrystals is revealed, and possible ways to control both the defect structure and antioxidant properties of nanoparticles are shown. The luminescence properties and antioxidant activity of nanoceria and ceria-based mixed (CeO₂—Re₂O₃ (Re = Y, Eu, Tb), CeO₂—ZrO₂) colloidal nanoparticles depends strongly on the type and concentration of doped ions and laser irradiation. The continuous UV irradiation with specific wavelengths leads to formation of additional Ce³⁺—V_o—Ce³⁺ complexes providing better antioxidant activity of pre-irradiated ceria nanoparticles.