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Surface passivation of CeO 2 catalyst and its ultraviolet screening effect

Title
Surface passivation of CeO 2 catalyst and its ultraviolet screening effect
Authors
Kang J.-H.Kim Y.-H.Paek S.-M.Choy J.-H.
Ewha Authors
최진호
SCOPUS Author ID
최진호scopus
Issue Date
2011
Journal Title
Journal of Nanoscience and Nanotechnology
ISSN
1533-4880JCR Link
Citation
vol. 11, no. 7, pp. 6448 - 6452
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A new strategy was attempted to fabricate CeO 2 nanoparticles using the surface fluorination technique to control the particle size and suppress the catalytic activity. The fluorinated CeO 2 nanoparticles are fully characterized with XRD, XANES , UV-vis spect troscopy, HR-TEM, XPS along with the evaluation of photo and thermal catalytic activitis e es. XRD patterns were not affected by surface fluorination. That is to say, the crystalline str ucture of CeO 2 was not deteriorated upon fluorination. The TEM analysis showed that the fluorina ted CeO b 2 nanoparticles with the primary particle size of 7 nm could be prepared. According to the X-ray absorption near edge structure (XANES) analysis, overall XANES spectrum was not changed upon fluorination, suggesting that the local structure of fluorinated CeO 2 resembled that of the starting CeO 2 nanoparticles. It was also revealed that both photo and thermal catalytic activities could be almost totally suppressed at the fluorination level of ca. 6.0 wt%. It is suggested that the selective surface fluorination with fluoride could lead to fluorinated CeO 2 nanoparticles, which could be applied to new fields such as the cosmetics industries. Copyright © 2011 American Scientific Publishers All rights reserved.
DOI
10.1166/jnn.2011.4422
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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