Chitosan as template for the synthesis of ceria nanoparticles

Journal Article · Tue Nov 15 00:00:00 EST 2011 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2011.07.049· OSTI ID:22210093

Gonzalez, G.; Ochoa, J. L. ^[1]; Tovar, L. M.; Zoltan, T. ^[2]; Canizales, E. ^[3]

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1. Centro de Ingenieria, Instituto Venezolano de Investigaciones Cientificas, Caracas 1020-A (Venezuela, Bolivarian Republic of)
2. Centro de Quimica, Instituto Venezolano de Investigaciones Cientificas, Caracas 1020-A (Venezuela, Bolivarian Republic of)
3. PDVSA, Intevep, Caracas 1020-A (Venezuela, Bolivarian Republic of)

Graphical abstract: Cerium oxide nanoparticles with cubic fluorite structure were prepared using chitosan as template, cerium nitrate as a starting material and sodium hydroxide as a precipitating agent. Calcinated powders at 350 {sup o}C contain agglomerated particles with average particle size of {approx}4 nm, very high porosity and foam-like morphology formed by open and close pores. Highlights: {yields} Pure CeO{sub 2} nanoparticles can take place using chitosan as template. {yields} A porous material was obtained. {yields} Blueshifts in the ultraviolet absorption spectra have been observed in cerium oxide nanocrystallites. -- Abstract: Cerium oxide (CeO{sub 2}), 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 {sup o}C. The synthesized powders were characterized by, XRD, HRTEM, UV-vis, FTIR, and TG-DTA. The average size of the nanoparticles obtained was {approx}4 nm and BET specific surface area {approx}105 m{sup 2} g{sup -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.

• OSTI ID: 22210093
• Journal Information: Materials Research Bulletin, Vol. 46, Issue 11; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
60 APPLIED LIFE SCIENCES
ABSORPTION SPECTRA
AMINO ACIDS
CERIUM NITRATES
CERIUM OXIDES
FOURIER TRANSFORMATION
INFRARED SPECTRA
NANOSTRUCTURES
OLIGOSACCHARIDES
OPTICAL PROPERTIES
PARTICLE SIZE
PRECIPITATION
SODIUM HYDROXIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION