Origin of the blue shift in ultraviolet absorption spectra of nanocrystalline CeO2-x particles

Shin Tsunekawa, Ryoji Sahara, Yoshiyuki Kawazoe, Atsuo Kasuya

Research output: Contribution to journalArticlepeer-review

102 Citations (Scopus)

Abstract

Blue shifts of the ultraviolet absorption edge due to the direct-type charge-transfer transition between O 2p and Ce 4 f bands are observed in monodisperse CeO2-x nanoparticles, which are produced as toluene sols by a successive micro-emulsification method. The blue shift is closely proportional to the difference in the electrostatic potentials felt by the respective constituent ions on the basis of a classical point charge model, in which both the effective charge and the number of oxygens per unit surface of the nanoparticles are reduced by half. This is the first demonstration of a blue shift in a charge-transfer transition of oxide (ionic) nanoparticles due to a non-quantum size effect.

Original languageEnglish
Pages (from-to)1104-1107
Number of pages4
JournalMaterials Transactions, JIM
Volume41
Issue number8
DOIs
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Engineering(all)

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