Growth mechanism, photoluminescence, and field-emission properties of ZnO nanoneedle arrays

被引：90

作者：

Zhang, Z ^{[1
]}

Yuan, H ^{[1
]}

Zhou, J ^{[1
]}

Liu, D ^{[1
]}

Luo, S ^{[1
]}

Miao, Y ^{[1
]}

Gao, Y ^{[1
]}

Wang, J ^{[1
]}

Liu, L ^{[1
]}

Song, L ^{[1
]}

Xiang, Y ^{[1
]}

Zhao, X ^{[1
]}

Zhou, W ^{[1
]}

Xie, S ^{[1
]}

机构：

[1] Chinese Acad Sci, Grad Sch, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2006年 / 110卷 / 17期

关键词：

D O I：

10.1021/jp0568632

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 nanoneedle arrays have been grown on a large scale with a chemical vapor deposition method at 680 degrees C. Zn powder and O-2 gas are employed as source materials, and catalyst-free Si plates are used as substrates. Energy-dispersive X-ray and X-ray diffraction analyses show that the nanoneedles are almost pure ZnO and preferentially aligned in the c-axis direction of the wurtzite structure. The growth mechanism of ZnO nanoneedle arrays is discussed with the thermodynamic theory and concluded to be the result of the co-effect of the surface tension and diffusion. Photoluminescence spectrum of the as-grown products shows a strong emission band centering at about 484 nm, which originates from oxygen vacancies. Field-emission examination exhibits that the ZnO nanoneedle arrays have a turn-on voltage at about 5.3V/mu m.

引用

页码：8566 / 8569

页数：4

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