Large-scale synthesis and field emission properties of vertically oriented CuO nanowire films

被引：348

作者：

Zhu, YW

Yu, T

Cheong, FC

Xui, XJ

Lim, CT

Tan, VBC

Thong, JTL

Sow, CH

机构：

[1] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[2] Natl Univ Singapore, Nanosci & Nanotechnol Initiat, Singapore 117542, Singapore

[3] Natl Univ Singapore, Dept Mech Engn, Singapore 117576, Singapore

[4] Natl Univ Singapore, Fac Engn, Ctr Integrated Circuit Failure Anal & Reliabil, Singapore 117576, Singapore

来源：

NANOTECHNOLOGY | 2005年 / 16卷 / 01期

关键词：

D O I：

10.1088/0957-4484/16/1/018

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Using a simple method of direct heating of bulk copper plates in air, oriented CuO nanowire films were synthesized on a large scale. The length and density of nanowires could be controlled by growth temperature and growth time. Field emission (FE) measurements of CuO nanowire films show that they have a low turn-on field of 3.5-4.5 V mum(-1) and a large current density of 0.45 mA cm(-2) under an applied field of about 7 V mum(-1). By comparing the FE properties of two types of samples with different average lengths and densities (30 mum, 10(8) cm(-2) and 4 mum, 4 x 10(7) cm(-2), respectively), we found that the large length-radius ratio of CuO nanowires effectively improved the local field, which was beneficial to field emission. Verified with finite element calculation, the work function of oriented CuO nanowire films was estimated to be 2.5-2.8 eV.

引用

页码：88 / 92

页数：5

共 22 条

[1] Carbon nanotubes - the route toward applications [J].