期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 509, 期 18, 页码 5627-5630出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.02.100
关键词
Oxide materials; X-ray diffraction; Crystal structure; ZnO
资金
- FRGS
- Universiti Sains Malaysia
Porous silicon (PS) technology is utilized to grow coral reef-like ZnO nanostructures on the surface of Si substrates with rough morphology. Flower-like aligned ZnO nanorods are also fabricated directly onto the silicon substrates through zinc powder evaporation using a simple thermal evaporation method without a catalyst for comparison. The characteristics of these nanostructures are investigated using field-emission scanning electron microscopy, grazing-angle X-ray diffraction (XRD), and photoluminescence `(PL) measurements of structures grown on both Si and porous Si substrates. The texture coefficient obtained from the XRD spectra indicates that the coral reef-like nanostructures are highly oriented on the porous silicon substrate with decreasing nanorods length and diameter from 800-900 nm to 3.5-5.5 mu m and from 217-229nm to 0.6-0.7 mu m, respectively. The PL spectra show that for ZnO nanocoral reefs the UV emission shifts slightly towards lower frequency and the intensity increase with the improvement of ZnO crystallization. This non-catalyst growth technique on the rough surface of substrates may have potential applications in the fabrication of nanoelectronic and nanooptical devices. (C) 2011 Elsevier B.V. All rights reserved.
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