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Sustainability Materials Group, International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Japan
; Fax: +81-298-60-4800
; Tel: +81-298-60-4799
Nanoscale, 2012,4, 4950-4953
21 Feb 2012,
25 Jun 2012
First published online
26 Jun 2012
A high concentration of Ce3+ ions, above 80%, was created in 5 nm thick cerium oxide nanoparticle (nanoceria) layers deposited on a polymer substrate. The reduction from Ce4+ to Ce3+ was achieved by irradiating the nanoceria layers with Ar ions, which resulted in the formation of oxygen vacancies at the surface. The samples were exposed to ambient air and compared with nanoceria pellets. Ce retained the 3+ valence state in the particle layers, but not in the pellets, even after 47 days of exposure to humid air. Thus, the irradiated nanoceria particle layers contain a high level of Ce3+ ions and possess an outstanding stability in air.
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