Enhanced Hydroxyl Radical Scavenging Activity by Doping Lanthanum in Ceria Nanocubes

Ceria nanoparticles have been reported to possess special antioxidant and catalytic properties due to their unique redox-:,Characteristics. In this study, single-crystalline CeO2 nanocubes were synthesized which demonstrated hydroxyl radical,-scavenging properties;!In order to further enhance such activity, 10% lanthanum (La) Was doped into the nanocubes by a hydrothermal method. The as-synthesized; La-modified ceria nanocubes presented' imprOvecl. radical scavenging activity spanning a range of concentrations and durations.. The structure and redox behavior of the nanocubes were characterized using Xray diffraction (XRD), inductively coupled plasma (ICP), X-ray photoelectron spectroscopy (XPS), high resolution electron microscopy (HREM), temperature-programmed reduction (TP12), oxygen storage capacity (OSC), etc. A mechanism was proposed on how the incorporation of La could affect the redox as well as-scavenging properties of CeO2 nanocubes.-This new, nanornaterial may be potentially used, as protective agent in bioapplications.