Core–shell Zn2GeO4 nanorods and their size-dependent photoluminescence properties

Songping Wu; Zhuolin Wang; Xin Ouyang; Zhiqun Lin

doi:10.1039/C3NR04638A

Core–shell Zn₂GeO₄ nanorods and their size-dependent photoluminescence properties†

Songping Wu,*^a Zhuolin Wang,^a Xin Ouyang^a and Zhiqun Lin*^b

* Corresponding authors

^a School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, China
E-mail: chwsp@scut.edu.cn
Fax: +86-20-87112897
Tel: +86-20-87112897

^b School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
E-mail: zhiqun.lin@mse.gatech.edu
Tel: +1 404 385 4404

Abstract

Size-tunable crystalline core–crystalline shell Zn₂GeO₄ nanorods were synthesized via a facile hydrothermal reaction. High purity Zn₂GeO₄ nanorods were obtained at pH = 7. The length of Zn₂GeO₄ nanorods (L = 50–100 nm) can be controlled through a one-step process, while micro-sized nanorods with an aspect ratio of the length to the diameter of 10 were yielded in a two-step process. The single crystalline nature of Zn₂GeO₄ nanorods with a core–shell structure was verified by high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) measurements. The Raman study revealed that there is no oxygen defect Image ID:c3nr04638a-t1.gif in Zn₂GeO₄ nanocrystals, suggesting that photoluminescence emission of Zn₂GeO₄ can be attributed to the presence of the interstitial Zn defect Image ID:c3nr04638a-t2.gif in Zn₂GeO₄ nanocrystals. As the diameter of nanorods decreased, the excitation and emission peaks appeared to be redshifted due to the quantum size effect.

Supplementary files

Article information

DOI: https://doi.org/10.1039/C3NR04638A
Article type: Paper
Submitted: 03 Sep 2013
Accepted: 03 Oct 2013
First published: 07 Oct 2013

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Nanoscale, 2013,5, 12335-12341

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Core–shell Zn₂GeO₄ nanorods and their size-dependent photoluminescence properties

S. Wu, Z. Wang, X. Ouyang and Z. Lin, Nanoscale, 2013, 5, 12335 DOI: 10.1039/C3NR04638A

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