4.4 Article

Low-temperature template-free synthesis of Cu2O hollow spheres

Journal

JOURNAL OF CRYSTAL GROWTH
Volume 311, Issue 8, Pages 2285-2290

Publisher

ELSEVIER
DOI: 10.1016/j.jcrysgro.2009.02.007

Keywords

Mass transfer; X-ray diffraction; Hydrothermal crystal growth; Oxides; Semiconducting materials

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Cuprous oxide (Cu2O) hollow spheres have been successfully prepared via a template-free hydrothermal method with the assistance of poly(vinylprrolidone) (PVP) at 90 degrees C. The structure and morphology of the Cu2O hollow spheres were characterized by X-ray diffraction, field-emission scanning electron microscope, and transmission electron microscope. The as-prepared hollow spheres are cubic phase Cu2O. The as-prepared products have a hollow sphere structure with outer diameters of 400-700 nm and the thickness of shells is about 40-70 nm. Poly(vinylprrolidone) is employed for the first time to improve the stabilization of crystalline phase occurred at a rate commensurate with localized Ostwald ripening and self-transformation for producing Cu2O hollow spheres. A possible PVP-assisted Ostwald ripening process is proposed for the formation of Cu2O hollow spheres on the basis of intermediate products at different growth stages. (C) 2009 Elsevier B.V. All rights reserved.

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