• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Coulomb explosion of vertically aligned carbon nanofibre induced by field electron emission
【24h】

Coulomb explosion of vertically aligned carbon nanofibre induced by field electron emission

机译：场电子发射引起垂直排列的碳纳米纤维的库仑爆炸

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Carbon nanofibre (CNF) field emitter failure is often encountered but there is a lack of understanding of its degradation behaviour and mechanism. This study, starting with a direct observation of a light emission followed by an Coulomb explosion, presents a systematic characterization of CNF emitter failure using a PMMA (poly(methyl methacrylate)) thin film based field emission microscopy (FEM) method. This unique CNF emitter failure behaviour is due to a combined effect of Joule heating and excessive charging at high FE current, ranging from 1.95 μA to 41.82 μA. Joule heating converts FE to extended Schottky emission and heats CNFs almost instantaneously. With the aid of Joule heating, Coulomb explosions disintegrate CNFs and generate annular craters of 60–70 μm on the PMMA thin film, melted areas of 10–20 μm on the substrate, and a sputter of PMMA around the emission sites in a range of 100–120 μm. This study successfully explains the behaviour and mechanism of CNF absence after FE, which is often simply attributed to uprooting or burnout of the CNFs. The detailed study of Coulomb explosion of CNF induced by FE allows the systematic design and optimization of CNF FE devices for long-lasting operation.
机译：碳纳米纤维（CNF）场发射器经常遇到故障，但是对其降解行为和机理缺乏了解。这项研究从直接观察光发射然后进行库仑爆炸开始，利用基于PMMA（聚（甲基丙烯酸甲酯））薄膜的场致发射显微镜（FEM）方法，对CNF发射器故障进行了系统表征。这种独特的CNF发射极故障行为是由于焦耳加热和在1.95μA至41.82μA的高FE电流下过度充电共同造成的。焦耳加热将FE转换为扩展的肖特基发射，并几乎立即加热CNF。借助焦耳加热，库仑爆炸会分解CNF，并在PMMA薄膜上产生60–70μm的环形凹坑，在基板上熔化10–20μm的熔化区域，并在发射点周围的PMMA溅射范围100–120微米。这项研究成功地解释了FE后CNF缺乏的行为和机制，这通常仅归因于CNF的连根拔除或倦怠。对有限元诱发的CNF的库仑爆炸的详细研究，可以对CNF有限元设备进行持久的系统设计和优化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号