Zinc oxide single-crystal microtubes

被引:75
|
作者
Cheng, JP [1 ]
Guo, RY
Wang, QM
机构
[1] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA
[2] Univ Pittsburgh, Dept Mech Engn, Pittsburgh, PA 15620 USA
[3] Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA
基金
美国国家科学基金会;
关键词
D O I
10.1063/1.1825067
中图分类号
O59 [应用物理学];
学科分类号
摘要
ZnO single-crystal microtubes were fabricated using an encapsulated microwave growth method. The ZnO crystals are grown in hexagonal hollow tube form with a well faceted end and side surfaces, which have cross-sectional dimensions of 100 to 250 mum, lengths of 3-5 mm, and wall thickness of 1-2 mum. Under optical excitation, a strong near-band-edge emission was obtained at a peak wavelength of 377.8 nm with a full width at half maximum of 11 nm. The ZnO microtubes exhibited a highly selective UV light response with a cut-off wavelength at similar to370 nm, and excellent electron field emission properties with an emission current density of 11 mA/cm(2) at an applied field of similar to20 V/mum. (C) 2004 American Institute of Physics.
引用
收藏
页码:5140 / 5142
页数:3
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