These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Selective growth of monoclinic and tetragonal zirconia nanocrystals.
    Author: Sato K, Abe H, Ohara S.
    Journal: J Am Chem Soc; 2010 Mar 03; 132(8):2538-9. PubMed ID: 20128607.
    Abstract:
    The growth of metal oxide nanocrystals with a well-organized crystalline phase is of fundamental and technological interest because in this way it is possible to tune their size-dependent unique properties. In this communication, we demonstrate the selective growth of monoclinic and tetragonal ZrO(2) nanocrystals of <10 nm diameter driven by controlling the surface energy, with and without capping by N(CH(3))(4)(+). The nanocrystals were grown in aqueous solution at 150 degrees C. It was revealed, by transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and optical absorption studies, that the nanocrystals capped by N(CH(3))(4)(+) have a less defective pure monoclinic phase, while those without capping have a pure tetragonal phase with highly disordered oxygen vacancies. The N(CH(3))(4)(+) capping on the surface oxygen site can reduce the surface energy low enough to stabilize the monoclinic phase. By contrast, the bare surface oxygen site has higher energy; thereby, the lower surface energy tetragonal phase is formed spontaneously. The present concept is a promising universal approach to control the crystal phases of technologically important oxide nanocrystals.
    [Abstract] [Full Text] [Related] [New Search]