Experimental evidence for self-assembly of CeO2 particles in solution: Formation of single-crystalline porous CeO2 nanocrystals

Hui Ru Tan, Joyce Pei Ying Tan, Chris Boothroyd, Thomas Willum Hansen, Yong Lim Foo, Ming Lin

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Single-crystalline porous CeO2 nanocrystals, with sizes of ∼20 nm and pore diameters of 1-2 nm, were synthesized successfully using a hydrothermal method. Using electron tomography, we imaged the three-dimensional structure of the pores in the nanocrystals and found that the oriented aggregation of small CeO2 nanoparticles resulted in the growth of CeO2 nanocrystals with an irregular truncated octahedral shape and pores extending along the 〈110〉 directions. Oxygen vacancies were found on the crystal surfaces and internal walls of the pores by scanning transmission electron microscopy and electron energy-loss spectroscopy. The oxygen vacancies might play an important role in oxygen diffusion in the crystals and the catalytic activities of single-crystalline porous CeO 2 structures. © 2011 American Chemical Society.
    Original languageEnglish
    JournalJournal of Physical Chemistry Part C: Nanomaterials and Interfaces
    Volume116
    Issue number1
    Pages (from-to)242-247
    ISSN1932-7447
    DOIs
    Publication statusPublished - 2012

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