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Blue-Shift of Ultraviolet Luminescence in Rough Surfaced ZnO Nanotubes Embedded in the AAO Template

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Abstract:

Polycrystal ZnO nanotube arrays with outer diameter about 46 – 70 nm have been fabricated by annealing zinc oxalate in the pores of anodic aluminum oxide (AAO) template. Each nanotube is made up of small nanoparticles with the average size of 4 –7 nm. The nanotubes embedded in the pores of AAO template constitute to a kind of quantum wells arranged alternatively by ZnO, Al2O3 and thin air layer. Rough surfaced structure increases the interactions between these layers, and enhances the quantum confinement effect. Similar to the ZnO/Al2O3 multiply layer structure, a strong near-band edge emission at about 336 nm is observed under the excitation of 220 nm. The blue shift of the near band transition originates from the raises of the Fermi level of ZnO nanotubes generated by the addition of donor Al3+. With the decrease of wall thickness, this ultraviolet peak becomes broad and stronger. Under the excitation of 380 nm, a main emission platform from 430 nm to 530 nm appears originated from the transition from conduction band tails to valence band tails contain a complex mechanical strains effected by many crystal defect. The higher energy emission properties may have potential applications for the ultraviolet light-emitting diodes and laser diodes.

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Journal of Nano Research Vol. 45 View Preview

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Periodical:

Journal of Nano Research (Volume 45)

Pages:

175-184

DOI:

https://doi.org/10.4028/www.scientific.net/JNanoR.45.175

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Online since:

January 2017

Authors:

Lei Yang*, Zhong Cheng Jiang

Keywords:

AAO Template, Nanostructures, Optical Properties, ZNO

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* - Corresponding Author

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