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Cathodoluminescence characterization of ZnO nanorods synthesized by chemical solution and of its conversion to ellipsoidal morphology

Published online by Cambridge University Press:  16 September 2014

Muhammad Israr-Qadir ,
Sadaf Jamil-Rana ,
Omer Nur ,
Magnus Willander ,
Jun Lu  and
Lars Hultman
Muhammad Israr-Qadir*
Affiliation:
Department of Science and Technology, Linköping University, Norrköping SE-60174, Sweden; and Materials Engineering Department, School of Chemical and Materials Engineering, National University of Science and Technology, Islamabad 44000, Pakistan
Sadaf Jamil-Rana*
Affiliation:
Department of Science and Technology, Linköping University, Norrköping SE-60174, Sweden
Omer Nur
Affiliation:
Department of Science and Technology, Linköping University, Norrköping SE-60174, Sweden
Magnus Willander
Affiliation:
Department of Science and Technology, Linköping University, Norrköping SE-60174, Sweden
Jun Lu
Affiliation:
Department of Physics, Chemistry and Biology, Linköping University, Linköping SE-58183, Sweden
Lars Hultman
Affiliation:
Department of Physics, Chemistry and Biology, Linköping University, Linköping SE-58183, Sweden
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

A facile and reproducible low-temperature (80 °C) solution route has been introduced to synthesize ZnO ellipsoids on silicon substrate without any pretreatment of the substrate or organic/inorganic additives. Scanning electron microscopy, transmission electron microscopy, and x-ray diffraction spectroscopy are performed to analyze the structural evolution, the single crystalline nature, and growth orientation at different stages of the synthetic process. The sequential formation mechanisms of heterogeneous nucleation in primary and secondary crystal growth behaviors have been discussed in detail. The presented results reveal that the morphology of micro/nanostructures with desired features can be optimized. The optical properties of grown structures at different stages were investigated using cathodoluminescence (CL). The monochromatic CL images were recorded to examine the UV and visible band emission contributions from the different positions of the intermediate and final structures of the individual ZnO ellipsoid. Significant enhancement in the defect level emission intensity at the central position of the structure reveals that the quality of the material improves as the reaction time is extended.

Keywords

chemical synthesiszinc oxideellipsoidheterogeneous nucleationcathodoluminescence
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 20 , 28 October 2014 , pp. 2425 - 2431
Copyright
Copyright © Materials Research Society 2014 

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References

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