Abstract

In this study, the vertically aligned carbon nanotubes (VACNTs) are fabricated on substrate via a simply spraying chemical vapor deposition method. The relationship between the field emission performance and the aspect ratio of the VACNTs is systematically studied. The optimal growth conditions of the VACNTs with outstanding field emission performance are obtained. Meanwhile, the field emission properties of the VACNTs are further improved via a simple acetone-densification treatment. After the densification, the turn-on electric field and threshold electric field could decrease to 0.83 V/μm and 2.45 V/μm, respectively, and the field enhancement factor will increase to 26,588. In addition, the field emission current stability of the VACNTs is also strengthened. The improvement of field emission performance could be resulted from the reduction of field shielding effect after tip densification. The high current density and good stability demonstrate that the densified VACNTs are the promising and highly efficient field electron emitters.

中文翻译：

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垂直排列的碳纳米管的场发射性能及其通过简单固溶处理的增强因子

摘要

在这项研究中，垂直排列的碳纳米管（VACNTs）是通过简单的喷涂化学气相沉积方法在基板上制造的。系统地研究了场发射性能与VACNT纵横比之间的关系。获得了具有出色场发射性能的VACNTs的最佳生长条件。同时，通过简单的丙酮致密化处理可以进一步改善VACNTs的场发射性能。致密化后，导通电场和阈值电场分别降低到0.83 V /μm和2.45 V /μm，场增强因子将增加到26,588。另外，VACNT的场发射电流稳定性也得到增强。尖端致密化后场屏蔽效应的降低可导致场发射性能的提高。高电流密度和良好的稳定性表明，致密的VACNTs是有前途且高效的场电子发射极。