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Surface passivation of CeO2 catalyst and its ultraviolet screening effect
Joo-Hee Kang1, Yun-Hee Kim, Seung-Min Paek
1Center for Intelligent Nano-Bio Materials (CINBM), Department of Bioinspired Science and Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 120-750, Korea.
Journal of Nanoscience and Nanotechnology
|November 30, 2011
Summary
Surface fluorination of cerium dioxide (CeO2) nanoparticles created 7 nm particles with suppressed catalytic activity. This controlled fabrication method opens new applications, potentially in cosmetics.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Cerium dioxide (CeO2) nanoparticles are widely used due to their catalytic properties.
- Controlling nanoparticle size and activity is crucial for targeted applications.
- Surface modification offers a route to tune material properties.
Purpose of the Study:
- To develop a novel surface fluorination technique for fabricating CeO2 nanoparticles.
- To control the particle size and suppress the catalytic activity of CeO2 nanoparticles.
- To explore potential new applications for modified CeO2 nanoparticles.
Main Methods:
- Fabrication of CeO2 nanoparticles using surface fluorination.
- Characterization using X-ray Diffraction (XRD), X-ray Absorption Near Edge Structure (XANES), UV-vis spectroscopy, High-Resolution Transmission Electron Microscopy (HR-TEM), and X-ray Photoelectron Spectroscopy (XPS).
- Evaluation of photo and thermal catalytic activities.
Main Results:
- Surface fluorination did not alter the crystalline structure of CeO2 nanoparticles.
- Fluorinated CeO2 nanoparticles with a primary particle size of 7 nm were successfully prepared.
- XANES analysis indicated that the local structure remained similar to the original CeO2.
- Photo and thermal catalytic activities were suppressed by approximately 6.0 wt% fluorination.
- Selective surface fluorination was achieved.
Conclusions:
- Surface fluorination is an effective strategy for controlling CeO2 nanoparticle size and suppressing catalytic activity.
- The fabricated fluorinated CeO2 nanoparticles retain their structural integrity.
- This controlled modification suggests potential applications in fields like cosmetics.
