Effect of aspect ratio on field emission properties of ZnO nanorod arrays

被引：77

作者：

Qian, Xuemin ^{[1
,2
]}

Liu, Huibiao ^{[1
]}

Guo, Yanbing ^{[1
]}

Song, Yinglin ^{[2
]}

Li, Yuliang ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Chem, BNLMS, CAS Key Lab Organ Solid, Beijing 100190, Peoples R China

[2] Suzhou Univ, Sch Phys Sci & Technol, Suzhou 215006, Jiangsu Prov, Peoples R China

来源：

NANOSCALE RESEARCH LETTERS | 2008年 / 3卷 / 08期

关键词：

ZnO nanorod; arrays; field emission; aspect ratio; density;

D O I：

10.1007/s11671-008-9154-0

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

ZnO nanorod arrays are prepared on a silicon wafer through a multi-step hydrothermal process. The aspect ratios and densities of the ZnO nanorod arrays are controlled by adjusting the reaction times and concentrations of solution. The investigation of field emission properties of ZnO nanorod arrays revealed a strong dependency on the aspect ratio and their density. The aspect ratio and spacing of ZnO nanorod arrays are 39 and 167 nm (sample C), respectively, to exhibit the best field emission properties. The turn-on field and threshold field of the nanorod arrays are 3.83 V/mu m and 5.65 V/mu m, respectively. Importantly, the sample C shows a highest enhancement of factor beta, which is 2612. The result shows that an optimum density and aspect ratio of ZnO nanorod arrays have high efficiency of field emission.

引用

页码：303 / 307

页数：5

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