DOI: https://doi.org/10.29363/nanoge.incnc.2021.040
Publication date: 8th June 2021
One of the most attractive points of synthetic nanochemistry is the possibility to precisely engineer the nanocrystal’s shape. For most metallic oxide compounds, however, this is not an easy task.
Cerium oxide (CeO2) is a rare-earth semiconductor capable of switching valence states between Ce3+ and Ce4+ without affecting the material structure when working at the nanoscale. The increase of surface area provided by the nanometric regime gives rise to the reversible removal of oxygen atoms from the exposed surface, generating a higher density of surface defects in the crystal structure. Electrons left behind by released oxygen localize on empty f states of cerium atoms (formally reduced from Ce4+ to Ce3+). The ability to work as an oxygen buffer is the core of the specific tasks it can be applied to, both in the nanocatalysis field and in biomedicine, where it is manly used as an antioxidant-like substance capable of the modulation of oxidative stress and inflammation-related processes .
Here we present how, through a deep mechanistic description of the synthetic process and the control of its key synthetic parameters, we can develop a strategy to obtain complex CeO2 nanostructures, like hollow nanocrystals or 2D nanosheets, using 3 nm CeO2 nanocrystals synthesized in situ as building blocks without surfactants or templates.
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