Single-walled carbon nanotube thermionic electron emitters with dense, efficient and reproducible electron emission,Nanoscale

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Single-walled carbon nanotube thermionic electron emitters with dense, efficient and reproducible electron emission
Nanoscale ( IF 5.8 ) Pub Date : 2017-10-17 00:00:00 , DOI: 10.1039/c7nr05388f
Yuwei Wang _{1,

2,

3,

4,

5} , Gongtao Wu _{1,

2,

3,

4,

5} , Li Xiang _{1,

2,

3,

4,

5} , Mengmeng Xiao _{1,

2,

3,

4,

5} , Zhiwei Li _{1,

2,

3,

4,

5} , Song Gao _{1,

2,

3,

4,

5} , Qing Chen _{1,

2,

3,

4,

5} , Xianlong Wei _{1,

2,

3,

4,

5}

Affiliation

Thermionic electron emitters have recently been scaled down to the microscale using microfabrication technologies and graphene as the filament. While possessing several advantages over field emitters, graphene-based thermionic micro-emitters still exhibit low emission current density and efficiency. Here, we report nanoscale thermionic electron emitters (NTEEs) fabricated using microfabrication technologies and single-walled carbon nanotubes (SWCNTs), the thinnest conducting filament we can use. The SWCNT NTEEs exhibit an emission current density as high as 0.45 × 10⁵ A cm⁻², which is superior to that of traditional thermionic emitters and five orders of magnitude higher than that of graphene-based thermionic emitters. The emission characteristics of SWCNT NTEEs are found to strongly depend on the electrical properties of the SWCNTs, with metallic SWCNT NTEEs showing a substantially lower turn-on voltage and more reproducible emission performances than those based on semiconducting SWCNTs. Our results indicate that SWCNT NTEEs are promising for electron source applications.

中文翻译：

单壁碳纳米管热电子发射体，具有密集，高效且可重现的电子发射

最近，使用微细加工技术和石墨烯作为灯丝，将热电子发射体的尺寸缩小到了微米级。基于石墨烯的热电子微型发射器尽管具有优于场发射器的多个优点，但仍显示出低的发射电流密度和效率。在这里，我们报告了使用微细加工技术和单壁碳纳米管（SWCNT）制成的纳米级热电子发射器（NTEE），这是我们可以使用的最薄的导电丝。SWCNT NTEE的发射电流密度高达0.45×10 ⁵ A cm ^-2，它优于传统的热电子发射器，比石墨烯基热电子发射器高五个数量级。发现SWCNT NTEE的发射特性在很大程度上取决于SWCNT的电性能，与基于半导体SWCNT的金属相比，金属SWCNT NTEE的导通电压低得多，并且可再现的发射性能更好。我们的结果表明，SWCNT NTEE在电子源应用方面很有前途。

更新日期：2017-11-23

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