期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 116, 期 26, 页码 14108-14114出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp300725s
关键词
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资金
- Office of Biological and Environmental Research
- NSF [NIRTCBET0708172]
- National Institute of Environmental Health Sciences [NIH U19 ES019544]
The oxidation state switching of cerium in cerium oxide nanoparticles is studied in detail. The influence of synthesis medium, aging time, and local environment on the oxidation state switching, between +3 and +4, is analyzed by tracking the absorption edge using UV-visible spectroscopy. It is observed that by tuning the local environment, the chemistry of the nanoparticles could be altered. These time-dependent, environmentally induced changes likely contribute to inconsistencies in the literature regarding quantum-confinement effects for ceria nanoparticles. The results in this Article indicate that there is a need to carry out comprehensive analysis of nanoparticles while considering the influence of synthesis and processing conditions, aging time and local environment.
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