Correlation between structural and electronic order-disorder effects and optical properties in ZnO nanocrystals

The correlation between structural and electronic order-disorder effects in understanding the optical properties of flower-like ZnO nanocrystals synthesized by the microwave-assisted hydrothermal method at low temperatures and short times is discussed. Theoretical simulations were performed at the d...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2014-01, Vol.2 (47), p.1164-1174
Main Authors: La Porta, F. A, Andrés, J, Vismara, M. V. G, Graeff, C. F. O, Sambrano, J. R, Li, M. S, Varela, J. A, Longo, E
Format: Article
Language:English
Subjects:
Conduction band
Correlation
Electronics
Field emission
Nanocrystals
Optical properties
Order disorder
Zinc oxide
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Summary:The correlation between structural and electronic order-disorder effects in understanding the optical properties of flower-like ZnO nanocrystals synthesized by the microwave-assisted hydrothermal method at low temperatures and short times is discussed. Theoretical simulations were performed at the density functional theory level to gain a better understanding of the experimental data from X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), electron paramagnetic resonance (EPR), ultraviolet-visible diffuse reflectance (UV-vis) spectroscopy and photoluminescence (PL) measurement studies at different temperatures. The decrease in band gap values is due to the presence of intermediate states above the conduction band. These discrete levels are formed by structural and electronic disorder of tetrahedral [ZnO 4 ] clusters which enhance the electron-hole pair. The correlation between structural and electronic order-disorder effects in understanding the optical properties of flower-like ZnO nanocrystals synthesized by the microwave-assisted hydrothermal method at low temperatures and short times is discussed.
ISSN:2050-7526
2050-7534
DOI:10.1039/c4tc01248h