ZnO/Al2O3 core-shell nanorod arrays: growth, structural characterization, and luminescent properties

C Y Chen; C A Lin; M J Chen; G R Lin; J H He

doi:10.1088/0957-4484/20/18/185605

ZnO/Al₂O₃ core-shell nanorod arrays: growth, structural characterization, and luminescent properties

C Y Chen, C A Lin, M J Chen, G R Lin, J H He^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

78 Citations (Scopus)

Abstract

We report an aqueous chemical method to fabricate well-aligned ZnO/Al₂O₃ nanocrystal (NC) core-shell nanorod arrays (NRAs). Structural characterization showed that the shell layers are composed of α-Al₂O₃ nanocrystals. Photoluminescence measurements showed the enhancement of near-band-edge (NBE) emission of ZnO NRAs due to the presence of Al₂O₃ NC shells. The Al₂O₃ NC shell layer resulting in the flat-band effect near the ZnO surface leads to a stronger overlap of the wavefunctions of electrons and holes in the ZnO core, further enhancing the NBE emission. This approach should be very useful in designing many other core-shell NRAs for creating varieties of high-efficiency optoelectronic devices.

Original language	English
Article number	185605
Journal	Nanotechnology
Volume	20
Issue number	18
Online published	15 Apr 2009
DOIs	https://doi.org/10.1088/0957-4484/20/18/185605
Publication status	Published - 6 May 2009
Externally published	Yes

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@article{4a04c2220835411cb31a4227b2c988a8,

title = "ZnO/Al2O3 core-shell nanorod arrays: growth, structural characterization, and luminescent properties",

abstract = "We report an aqueous chemical method to fabricate well-aligned ZnO/Al2O3 nanocrystal (NC) core-shell nanorod arrays (NRAs). Structural characterization showed that the shell layers are composed of α-Al2O3 nanocrystals. Photoluminescence measurements showed the enhancement of near-band-edge (NBE) emission of ZnO NRAs due to the presence of Al2O3 NC shells. The Al2O3 NC shell layer resulting in the flat-band effect near the ZnO surface leads to a stronger overlap of the wavefunctions of electrons and holes in the ZnO core, further enhancing the NBE emission. This approach should be very useful in designing many other core-shell NRAs for creating varieties of high-efficiency optoelectronic devices.",

author = "Chen, {C Y} and Lin, {C A} and Chen, {M J} and Lin, {G R} and He, {J H}",

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TY - JOUR

T1 - ZnO/Al2O3 core-shell nanorod arrays

T2 - growth, structural characterization, and luminescent properties

AU - Chen, C Y

AU - Lin, C A

AU - Chen, M J

AU - Lin, G R

AU - He, J H

PY - 2009/5/6

Y1 - 2009/5/6

N2 - We report an aqueous chemical method to fabricate well-aligned ZnO/Al2O3 nanocrystal (NC) core-shell nanorod arrays (NRAs). Structural characterization showed that the shell layers are composed of α-Al2O3 nanocrystals. Photoluminescence measurements showed the enhancement of near-band-edge (NBE) emission of ZnO NRAs due to the presence of Al2O3 NC shells. The Al2O3 NC shell layer resulting in the flat-band effect near the ZnO surface leads to a stronger overlap of the wavefunctions of electrons and holes in the ZnO core, further enhancing the NBE emission. This approach should be very useful in designing many other core-shell NRAs for creating varieties of high-efficiency optoelectronic devices.

AB - We report an aqueous chemical method to fabricate well-aligned ZnO/Al2O3 nanocrystal (NC) core-shell nanorod arrays (NRAs). Structural characterization showed that the shell layers are composed of α-Al2O3 nanocrystals. Photoluminescence measurements showed the enhancement of near-band-edge (NBE) emission of ZnO NRAs due to the presence of Al2O3 NC shells. The Al2O3 NC shell layer resulting in the flat-band effect near the ZnO surface leads to a stronger overlap of the wavefunctions of electrons and holes in the ZnO core, further enhancing the NBE emission. This approach should be very useful in designing many other core-shell NRAs for creating varieties of high-efficiency optoelectronic devices.

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DO - 10.1088/0957-4484/20/18/185605

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