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

Author

C. C. Lin, Chung-Yuan Kung, San-Lin Young, Chung Jen Ou, Hone-Zern Chen, Ming-Cheng Kao, Teng Tsai Lin, Y. T. Shih, and Lance Horng

Subjects
Photoluminescence, Materials science, Saturation magnetization, Silicon, Nanochemistry, chemistry.chemical_element, Nanotechnology, Substrate (electronics), symbols.namesake, Materials Science(all), General Materials Science, Wurtzite crystal structure, Nano Express, business.industry, Doping, Condensed Matter Physics, Y-doped ZnO nanorods, chemistry, symbols, Ferromagnetism, Optoelectronics, Nanorod, Raman spectroscopy, business, Wurtzite
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.

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