Chitosan as template for the synthesis of ceria nanoparticles

Abstract:

Cerium oxide (CeO2), nanoparticles were prepared using chitosan as template, cerium nitrate as a starting material and sodium hydroxide as a precipitating agent. The resultant ceria-chitosan spheres were calcined at 350 °C. The synthesized powders were characterized by, XRD, HRTEM, UV-vis, FTIR, and TG-DTA. The average size of the nanoparticles obtained was ∼4 nm and BET specific surface area ∼105 m2 g-1. Blueshifts in the ultraviolet absorption spectra have been observed in cerium oxide nanocrystallites. The band-gap was found to be 4.5 eV. The blueshifts are well explained for diameters down to less than a few nanometers by the change in the electronic band structure. © 2011 Elsevier Ltd. All rights reserved.

Año de publicación:

2011

Keywords:

• Chemical synthesis
• optical properties
• Electron microscopy
• X-Ray diffraction
• Oxides

Fuente:

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