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Blueshifts in the ultraviolet absorption spectra of cerium oxide nanocrystallites

2003; American Institute of Physics; Volume: 94; Issue: 5 Linguagem: Inglês

10.1063/1.1600520

1520-8850

Shin Tsunekawa, Jian-Tao Wang, Yoshiyuki Kawazoe, A. Kasuya,

Quantum Dots Synthesis And Properties

Blueshifts in the ultraviolet absorption spectra have been observed in cerium oxide nanocrystallites. The mechanism of the absorption is a charge-transfer optical transition. The relationships among the blueshift, valence state of cerium ions, and the particle size are formulated. The blueshifts are well explained for diameters down to less than a few nanometers by the change in the electronic band structure.