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Wavelength‐Selective Photoreduction of Colloidal CeO 2– x Nanocrystals
Author(s) -
Seminko Vladyslav,
Maksimchuk Pavel,
Avrunin Oleg,
Semenets Valerii,
Malyukin Yuri
Publication year - 2019
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201900325
Subject(s) - cerium , luminescence , redox , nanoparticle , nanocrystal , oxygen , photochemistry , materials science , ion , absorption (acoustics) , irradiation , inorganic chemistry , chemistry , analytical chemistry (journal) , nanotechnology , optoelectronics , physics , organic chemistry , chromatography , nuclear physics , composite material
The Ce 3+ ↔ Ce 4+ redox dynamics of colloidal nanoceria at hydrogen peroxide (HP) addition is studied using the luminescence of Ce 3+ cations. The fast oxidation (Ce 3+ → Ce 4+ ) and slow reduction (Ce 4+ → Ce 3+ ) phases of nanoceria–oxidant interaction are discussed. Both the phases are mediated by oxygen diffusion within ceria nanoparticles. Laser‐light irradiation with specific wavelengths causes a significant acceleration of Ce 4+ → Ce 3+ reduction phase. This effect is observed only under excitation to the charge‐transfer (Ce 4+ –O 2− ) absorption band of nanoceria. The partial transfer of charge from oxygen to cerium ions leads to decrease in the binding energy and the effective radius of O 2− anions accelerating the oxygen diffusion in the nanoceria lattice.
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