【摘要】 研究了CVD法定向生长的多壁碳纳米管薄膜的在高电压条件下场发射特性 .我们发现在固定电压条件下发射电流和时间的关系按指数规律减弱 .另一个值得关注的现象是碳纳米管的发射性能的不可恢复性损坏 .电流电压关系也由幂次关系I =aVb 改变为幂次关系I =a(V -V0 ) b′,其中 ,b和b′的值均为 2～ 3.最后讨论了电流减弱的原因更多还原

【Abstract】 The field emission property of a CNT (multi-wall) film,which was produced by CVD method with self-oriented,has been investigated under a very high vacuum condition.Certain interesting measurement results are described in this paper.It was found that its emitting current degraded exponentially with the integrated time of voltage applying while a fixed tube voltage was applied.Another notable phenomenon is that as its emitting efficiency decreasing unrecoverly,the Current-Voltage relationship of that sample also changed from a power function as I=aV~b into anther power function as I=a(V-V\-0)~ b′ .Both b and b′ have similar value from 2 to 3.A possible explanation of this degradation is discussed in this paper as well.更多还原