CuO-ZnO heterometallic hollow spheres: Morphology and defect structure
- Inner Mongolia Key Laboratory of Coal Chemistry, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021 (China)
The Cu-ZnO hollow spheres, where CuO nanocrystals were dispersed in the shell of ZnO nanoparticals, were synthesized by using highly uniform and monodispersed Cu-embedded carbon spheres as sacrificial templates via a simple route under hydrothermal conditions. The morphology and structure of the spheres were characterized by FTIR, XRD, SEM, TEM and N{sub 2} adsorption-desorption. It was suggested that the OH and C=O groups in the surface of the Cu-embedded carbon spheres facilitated the adsorption of Zn{sup 2+} in the aqueous solution, giving rise to the final CuO-ZnO hollow structure after these Zn{sup 2+}-adsorbed spheres were calcined in air. Moreover, the photoluminescence (PL) study showed that the as-prepared CuO-ZnO hollow spheres and the annealed counterpart exhibited strong and dramatically weakened emissions, respectively. This remarkably different photoluminescent behavior afforded the evidence regarding the oxygen vacancy defects in the CuO-ZnO hollow spheres. - Graphical abstract: CuO-ZnO hollow spheres were obtained using Cu-embedded carbon spheres as template, and the photoluminescent spectra afforded the evidence regarding the oxygen vacancies in the hollow spheres. Highlights: Black-Right-Pointing-Pointer A approach was presented to prepare carbon spheres in a high yield. Black-Right-Pointing-Pointer The fabrication of CuO-ZnO hollow spheres was a simple route. Black-Right-Pointing-Pointer The photoluminescence afforded the evidence of the oxygen vacancies in the hollows. Black-Right-Pointing-Pointer The synthetic approach might be applicable to preparing other hollow structures.
- OSTI ID:
- 21612893
- Journal Information:
- Journal of Solid State Chemistry, Vol. 186; Other Information: DOI: 10.1016/j.jssc.2011.11.045; PII: S0022-4596(11)00651-7; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ADSORPTION
AQUEOUS SOLUTIONS
CARBON
COPPER OXIDES
DEFECTS
DESORPTION
FOURIER TRANSFORMATION
INFRARED SPECTRA
MORPHOLOGY
NANOSTRUCTURES
PHOTOLUMINESCENCE
SCANNING ELECTRON MICROSCOPY
SURFACES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ZINC OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
DIFFRACTION
DISPERSIONS
ELECTRON MICROSCOPY
ELEMENTS
EMISSION
HOMOGENEOUS MIXTURES
INTEGRAL TRANSFORMATIONS
LUMINESCENCE
MICROSCOPY
MIXTURES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHOTON EMISSION
SCATTERING
SOLUTIONS
SORPTION
SPECTRA
TRANSFORMATIONS
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS