Two-dimensional growth and field emission properties of ZnO microtowers

被引：26
作者：
Xu, Feng
Yu, Ke
Li, Qiong
Zhu, Ziqiang [1 ]
Yao, Takafumi
机构：
[1] E China Normal Univ, Dept Elect Engn, Shanghai 200062, Peoples R China
[2] Tohoku Univ, Interdisciplinary Res Ctr, Sendai, Miyagi 9808578, Japan
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 11期
关键词：
D O I：
10.1021/jp067362z
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：
ZnO microtowers were synthesized on silicon substrate by the vapor-phase transport method at a low temperature of around 550 degrees C under atmospheric pressure. The microstructure and morphology of the ZnO microtowers were evaluated by using X-ray diffraction and scanning and transmission electron microscopies. The two-dimensional growth mechanism of the microtowers was investigated. Room temperature photoluminescence spectra of the microtowers showed a UV emission band centering at about 388 nm and wide green emissions around 500 nm. Field emission measurements demonstrated that the microtowers with sharp tips of several nanometers in curvature radius possessed good performance with a turn-on field of similar to 1.8 V/mu m and a threshold field of similar to 4.8 V/mu m.
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收藏
页码：4099 / 4104
页数：6
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