School of Electrical Engineering, Korea University, Seoul 136-713, Korea.
Nanotechnology. 2010 Jan 8;21(1):015704. doi: 10.1088/0957-4484/21/1/015704. Epub 2009 Nov 30.
The improved field emission stability of thin multiwalled carbon nanotube (thin-MWCNT) emitters using a tip sonication process has been investigated. The thin-MWCNTs showed short lengths and many open tips after the tip sonication treatment. The field emission properties of the thin-MWCNT emitters were investigated. Field emission stability dramatically increased as the tip sonication time increased. In particular, field emission current at an acceleration condition was quite stable and showed no degradation for over 19 h after tip sonication treatment of 30 min. Tip sonication could effectively cut CNTs short and regulate the length of CNTs. Therefore, field emission stability was significantly improved during a long period of operation because many shortened thin-MWCNTs could participate in field emission after the treatment.
采用尖端超声处理改善了薄多壁碳纳米管（thin-MWCNT）发射器的场发射稳定性。尖端超声处理后，thin-MWCNTs 呈现出短的长度和许多开放的尖端。研究了 thin-MWCNT 发射器的场发射特性。随着尖端超声处理时间的增加，场发射稳定性显著提高。特别是，在加速条件下的场发射电流非常稳定，在经过 30 分钟的尖端超声处理后，超过 19 小时没有出现降解。尖端超声处理可以有效地将 CNTs 切断，并调节 CNTs 的长度。因此，在长时间的运行过程中，场发射稳定性得到了显著提高，因为在处理后，许多缩短的 thin-MWCNTs 可以参与场发射。
