Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays

被引:6
|
作者
Li, Mengjie [1 ]
Wang, Qilong [1 ]
Xu, Ji [1 ]
Zhang, Jian [1 ]
Qi, Zhiyang [1 ]
Zhang, Xiaobing [1 ]
机构
[1] Southeast Univ, Sch Elect Sci & Engn, Nanjing 210096, Peoples R China
基金
美国国家科学基金会;
关键词
photo-electron emission; optically induced field emission; field emission; VCNTAs; photosensitivity; THERMIONIC EMISSION; ULTRAFAST; EMITTERS; NANOPARTICLES; METALS;
D O I
10.3390/nano11071810
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Due to the high field enhancement factor and photon-absorption efficiency, carbon nanotubes (CNTs) have been widely used in optically induced field-emission as a cathode. Here, we report vertical carbon nanotube arrays (VCNTAs) that performed as high-density electron sources. A combination of high applied electric field and laser illumination made it possible to modulate the emission with laser pulses. When the bias electric field and laser power density increased, the emission process is sensitive to a power law of the laser intensity, which supports the emission mechanism of optically induced field emission followed by over-the-barrier emission. Furthermore, we determine a polarization dependence that exhibits a cosine behavior, which verifies the high possibility of optically induced field emission.
引用
收藏
页数:10
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