Tunable graphene micro-emitters with fast temporal response and controllable electron emission

被引：66
作者：
Wu, Gongtao [1 ]
Wei, Xianlong [1 ]
Gao, Song [1 ]
Chen, Qing [1 ]
Peng, Lianmao [1 ]
机构：
[1] Peking Univ, Dept Elect, Key Lab Phys & Chem Nanodevices, Beijing 100871, Peoples R China
来源：
NATURE COMMUNICATIONS | 2016年 / 7卷
基金：
高等学校博士学科点专项科研基金;
关键词：
FIELD-EMISSION; ARRAYS;
D O I：
10.1038/ncomms11513
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Microfabricated electron emitters have been studied for half a century for their promising applications in vacuum electronics. However, tunable microfabricated electron emitters with fast temporal response and controllable electron emission still proves challenging. Here, we report the scaling down of thermionic emitters to the microscale using microfabrication technologies and a Joule-heated microscale graphene film as the filament. The emission current of the graphene micro-emitters exhibits a tunability of up to six orders by a modest gate voltage. A turn-on/off time of less than 1 mu s is demonstrated for the graphene micro-emitters, indicating a switching speed about five orders of magnitude faster than their bulky counterparts. Importantly, emission performances of graphene micro-emitters are controllable and reproducible through engineering graphene dimensions by microfabrication technologies, which enables us to fabricate graphene micro-emitter arrays with uniform emission performances. Graphene micro-emitters offer an opportunity of realizing large-scale addressable micro-emitter arrays for vacuum electronics applications.
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页数：8
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