Numerical Simulation of Electric Field Enhancement Factor of Graphene Nanoflake

李智军; 张晖; 范玉锋; 薛河

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Numerical Simulation of Electric Field Enhancement Factor of Graphene Nanoflake

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- Numerical Simulation of Electric Field Enhancement Factor of Graphene Nanoflake
- 石墨烯纳米片电场增强因子的模拟计算与对比
- Vol. 33, Issue 2, Pages: 207-210(2012)
- 作者机构：
  
  1. 西安科技大学机械工程学院
  2. 西安交通大学理学院教育部非平衡物质与量子调控重点实验室
  3. 西安交通大学电子与信息工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2012
- 稿件说明：
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李智军, 张晖, 范玉锋, et al. Numerical Simulation of Electric Field Enhancement Factor of Graphene Nanoflake[J]. 2012, 33(2): 207-210.
DOI：

李智军, 张晖, 范玉锋, et al. Numerical Simulation of Electric Field Enhancement Factor of Graphene Nanoflake[J]. 2012, 33(2): 207-210. DOI：

摘要

石墨烯纳米片特殊的一维刀口状尖端赋予了其优异的电子场发射性能

而电场增强因子β是评价场发射性能的最重要参数

主要采用测定F-N曲线的实验方法进行推算.建立了形状为矩形薄片+半圆圆柱的石墨烯纳米片模型

竖直立于平行平板二极管的阴极上

利用电子束模拟软件EBS(Electron BeamSimulation)模拟计算了场发射装置的两极间的电场分布

由此决定石墨烯纳米片尖端的电场增强系数.研究了高度和顶端曲率半径变化对石墨烯纳米片电场增强因子的影响

根据计算数值拟合了电场增强系数的经验公式

提供了受形状控制的电场增强因子的数值范围

还与同尺寸的碳纳米管进行了比较

证实了本文的模型和计算模拟方法有效、可信.

Abstract

Graphene nano flake(GNF) features properties of electron emission due to its one-dimensional sharp edge.Field enhancement factor β is an important parameter for emission evaluation

which is usually obtained by F-N curve measurement.In this paper

the field enhancement at the end of a single GNF vertical to the plate was calculated with the software of Electron Beam Simulation(EBS).By polynomial regression and fit of the calculation data

an empirical expression was drawn.The effects of the height and edge curvature of the GNF on β were investigated.The efficient range of the GNF as a good emitter was studied.By comparing the GNT the CNT with the similar size

it was proved feasibility of the proposed model and calculation.

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references

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潘金艳,朱长纯.提高碳纳米管阴极膜场发射特性的研究[J].功能材料与器件学报,2008,14(6):1001.Pan J Y,Zhu C C.Research on improving fieldemission characteristics of printing carbon nanotubes cathode films[J].Journal of Function Materials and Devices,2008,14(6):1001.(in Chinese).

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朱亚波,王万录,廖克俊.对碳纳米管阵列的场发射电场增强因子以及最佳阵列密度的研究[J].物理学报,2002,51(10):2335-2339.Zhu Y B,Wang W L,Liao K J.Study on the electric field enhancement factor and the optimum densities of carbon nanotube arrays[J].Acta Physica Sinica,2002,51(10):2335-2339.(in Chinese)

Wang Chengwei.Well-aligned carbon nanotube array membrane and its field emission properties[J].Science in China,Ser.A,2001,44(2):234-240.

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