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Sonochemical Synthesis of Cerium Oxide Nanoparticles—Effect of Additives and Quantum Size Effect

✍ Scribed by Lunxiang Yin; Yanqin Wang; Guangsheng Pang; Yuri Koltypin; Aharon Gedanken

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
368 KB
Volume
246
Category
Article
ISSN
0021-9797

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✦ Synopsis

Cerium oxide (CeO 2 ) nanoparticles were prepared sonochemically, by using cerium nitrate and azodicarbonamide as starting materials, and ethylenediamine or tetraalkylammonium hydroxide as additives. The additives have a strong effect on the particle size and particle size distribution. CeO 2 nanoparticles with small particle size and narrow particle size distribution are obtained with the addition of additives; while highly agglomerated CeO 2 nanoparticles are obtained in the absence of additives. Monodispersed CeO 2 nanoparticles with a mean particle size of ca. 3.3 nm are obtained when tetramethylammonium hydroxide (TMAOH) is used as the additive and the molar ratio of cerium nitrate/azodicarbonamine/TMAOH is 1/1/1. Blue shifts of the absorption peak and the absorption edges of the products are observed in the UV-Vis absorption spectra as a result of the quantum size effect. The samples have been characterized using powder XRD, TEM, DLS, and absorption spectra.

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