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Influence of Y-doped induced defects on the optical and magnetic properties of ZnO nanorod arrays prepared by low-temperature hydrothermal process

Chung-Yuan Kung1*, San-Lin Young2*, Hone-Zern Chen2, Ming-Cheng Kao2, Lance Horng3, Yu-Tai Shih3, Chen-Cheng Lin1, Teng-Tsai Lin1 and Chung-Jen Ou4

Author Affiliations

1 Department of Electrical Engineering, National Chung Hsing University, Taichung, 40227, Taiwan

2 Department of Electronic Engineering, Hsiuping University of Science and Technology, Taichung, 41280, Taiwan

3 Department of Physics, National Changhua University of Education, Changhua, 50007, Taiwan

4 Department of Electrical Engineering, Hsiuping University of Science and Technology, Taichung, 41280, Taiwan

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Nanoscale Research Letters 2012, 7:372  doi:10.1186/1556-276X-7-372

Published: 7 July 2012

Abstract

One-dimensional pure zinc oxide (ZnO) and Y-doped ZnO nanorod arrays have been successfully fabricated on the silicon substrate for comparison by a simple hydrothermal process at the low temperature of 90°C. The Y-doped nanorods exhibit the same c-axis-oriented wurtzite hexagonal structure as pure ZnO nanorods. Based on the results of photoluminescence, an enhancement of defect-induced green-yellow visible emission is observed for the Y-doped ZnO nanorods. The decrease of E2(H) mode intensity and increase of E1(LO) mode intensity examined by the Raman spectrum also indicate the increase of defects for the Y-doped ZnO nanorods. As compared to pure ZnO nanorods, Y-doped ZnO nanorods show a remarked increase of saturation magnetization. The combination of visible photoluminescence and ferromagnetism measurement results indicates the increase of oxygen defects due to the Y doping which plays a crucial role in the optical and magnetic performances of the ZnO nanorods.

Keywords:
Y-doped ZnO nanorods; Wurtzite; Saturation magnetization; Photoluminescence; Ferromagnetism