Enhancement of electron field emission from density-controlled carbon nanotubes

被引：0
|
作者：
Uh, Hyung Soo [1 ]
Park, Sang Sik [1 ]
Kim, Byung Whan [1 ]
Lee, Naesung [2 ]
Kwon, Sang Jik [3 ]
Cho, Eno Sik [3 ]
机构：
[1] Sejong Univ, Dept Elect Engn, Seoul 143747, South Korea
[2] Sejong Univ, Fac Nanotechnol & Adv Mat Engn, Seoul 143747, South Korea
[3] Kyungwon Univ, Dept Elect Engn, Songnam 461701, South Korea
来源：
JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2007年 / 51卷
关键词：
carbon nanotube; field emission; electric-field-screening effect;
D O I：
暂无
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In this study, we investigated the effect of catalyst pretreatment by NH3 plasma on the growth of CNTs by plasma-enhanced chemical vapor deposition and their field emission properties. Thickness of catalytic Ni was varied from 5 to 100 angstrom. It was found that the catalyst nanoparticles which were essential for the CVD synthesis of CNTs were formed well after plasma pretreatment and the size of the nanoparticles was strongly dependent on the Ni thickness and plasma pretreatment. In field emission measurement using diode-type configuration, the low-density and smaller-diameter CNTs synthesized from Ni catalyst layer after NH3 plasma pretreatment showed a smaller electric-field-screening effect, which, in turn, increased the field enhancement factor by a factor of 4 compared with as-grown CNTs from Ni without plasma pretreatment. CNT emitters obtained from plasmapretreated 25-angstrom-thick Ni catalysts showed excellent field emission characteristics with a very low turn-on field of 1.1 V/mu m at 10 mu A/cm(2) and a high emission current density of 1.9 mA/cm(2) at 4.0 V/mu m, respectively. In addition, experimental results revealed that the catalyst thickness might be optimized for electron emission efficiency.
引用
收藏
页码：S293 / S297
页数：5
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