Growth of aligned ZnO nanorod arrays by catalyst-free pulsed laser deposition methods

被引:420
作者
Sun, Y [1 ]
Fuge, GM [1 ]
Ashfold, MNR [1 ]
机构
[1] Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England
基金
英国工程与自然科学研究理事会;
关键词
D O I
10.1016/j.cplett.2004.07.110
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Arrays of well-aligned ZnO nanorods were synthesized on a Si substrate at 600 degreesC by 193 nm pulsed laser ablation of a ZnO target in low pressures of oxygen. Electron microscopy and X-ray diffraction revealed highly c-axis aligned, ultra-thin, needle-like nanorods with tip diameters <50 nm growing vertically from the substrate. Many of the rods appear to be capped by particles, which high-resolution transmission electron microscopy shows to be ZnO also. It is suggested that these derive from post-growth crystallisation of oxygen rich molten zinc droplets that cap the nanorods during growth- indicating a vapour-liquid-solid growth mechanism. The room temperature photoluminescence spectra of these samples show strong, narrow bandwidth UV emission similar to380 nm and only weak visible emission. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:21 / 26
页数:6
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