Field Electron Emission Characteristics and Physical Mechanism of Individual Single-Layer Graphene
Field Electron Emission Characteristics and Physical Mechanism of Individual Single-Layer Graphene
复制标题
单层石墨烯的场电子发射特性及物理机制
DOI：
10.1021/nn101719r
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发表时间：
2010-11-01
期刊：
影响因子：
17.1
通讯作者：
Xu, Ningsheng
中科院分区：
文献类型：
--
作者：
Xiao, Zhiming;She, Juncong;Xu, Ningsheng
由于其难度，来自单层石墨烯的场发射的实验测量尚未被报道;尽管来自二维（2D）区域的场发射一直是一个有吸引力的话题。石墨烯的开放表面和锋利的边缘有利于电子发射。2D，几何效应，如无质量的狄拉克费米子，可以导致场发射中的新机制。我们报告了我们的研究结果，从现场场电子发射特性对一个单独的单一，层石墨烯和相关机制的理解。来自边缘的场发射的测量使用装备在微阳极探针中的微阳极探针进行。扫描电子显微镜我们表明，经过仔细的调节过程，可以获得可重复的稳定场发射电流。这使我们能够从实验上检查来自2D区域的场发射的典型特征。我们分别在类似于1/E的In（I/E-3/2）和类似于1/E-2的In（I/E-3）坐标中绘制电流与外加场数据的关系图，观察到这些曲线都呈现向上弯曲的特征，揭示了场发射过程经历了从低场到高场的转变，并从理论上讨论了产生这种现象的物理机制。
Due to its difficulty, experimental measurement of field emission from a single layer graphene has not been,reported;although field emission from a two dimensional (2D) regime has been an attractive topic. The open surface and sharp edge of graphene are beneficial for electron emission A 2D, geometrical effect, such as massless Dirac fermion, can lead to new mechanism in field emission Here, we report our findings from in situ field electron emission Characterization on an individual singe-layer graphene and the understanding of the related mechanism The measurement of field emission from the edges was done using a microanode probe equipped in a scanning electron microscope We show that repeatable stable field emission current can be obtained after a careful conditioning process This enables us to examine experimentally the typical features of the field emission from a 2D regime We plot current versus applied field data, respectively, in In(I/E-3/2) similar to 1/E and In(I/E-3)similar to 1/E-2 coordinates, which have recently been proposed for field emission trim graphene in high and low field regimes It is observed that the plots all exhibit an upward bending feature, revealing that the field emission processes undergo from a low to high field transition We discuss with theoretical analysis the physical mechanism responsible for the new phenomena