Field-emission properties of multiwalled carbon nanotubes in gas

被引：1

作者：

Zou, Q. ^{[1
]}

Wang, M. Z. ^{[1
]}

机构：

[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China

来源：

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B | 2009年 / 27卷 / 03期

关键词：

carbon nanotubes; cathodes; discharges (electric); scanning electron microscopy; vacuum techniques;

D O I：

10.1116/1.3119683

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Ar gas effects on the field-emission (FE) properties of multiwalled carbon nanotubes (CNTs) were investigated. The FE measurement was carried out in vacuum and in Ar gas using a scanning-electron microscope (SEM) chamber with a removable gas cell fitted in the SEM chamber. The gap between electrodes was set by observing a SEM image. The electrodes were characterized in situ before and after FE measurements by SEM observation. The FE properties of CNTs in Ar gas at 80 kPa and lower pressures were the same as those in vacuum before and after the measurements in gas. At pressures more than 80 kPa, the FE threshold voltages in Ar gas were higher than those in vacuum and increased with increasing Ar gas pressure. However, the FE properties in vacuum after the measurement in gas were the same as before. When the FE threshold voltages became higher than the voltage for gas breakdown, a gas discharge was ignited before the FE appearance. After the gas discharge, the carbon nanotube cathode was damaged.

引用

页码：1053 / 1056

页数：4

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