Enhanced Hydroxyl Radical Scavenging Activity by Doping Lanthanum in Ceria Nanocubes

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• 作者：Susana Fernandez-Garcia ; Lei Jiang ; Miguel Tinoco ; Ana B. Hungria ; Juan Han ; Ginesa Blanco ; Jose J. Calvino ; Xiaowei Chen
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：January 28, 2016
• 年：2016
• 卷：120
• 期：3
• 页码：1891-1901
• 全文大小：566K
• ISSN：1932-7455

文摘

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 improved radical scavenging activity spanning a range of concentrations and durations. The structure and redox behavior of the nanocubes were characterized using X-ray diffraction (XRD), inductively coupled plasma (ICP), X-ray photoelectron spectroscopy (XPS), high resolution electron microscopy (HREM), temperature-programmed reduction (TPR), 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 nanomaterial may be potentially used as protective agent in bioapplications.