期刊
NANOTECHNOLOGY
卷 32, 期 28, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/abf5fb
关键词
graphene; field emission; low energy; electron transmission
资金
- AFOSR/MURI [FA9550-18-1-0436]
- DARPA INVEST Program [N6600116-1-4038]
- MIT UROP (Undergraduate Research Opportunities Program)
Experimental demonstration of electron transmission through suspended graphene layers with significant increase in current, possibly due to generation of secondary electrons by primary electrons. Monolayer graphene shows highest output current at approximately 90 eV, up to 1.7 times the incident current, offering potential for low-voltage field emission electron sources in less stringent vacuum environments.
We experimentally demonstrate the transmission of electrons through different number (1, 2, and 5) of suspended graphene layers at electron energies between 20 and 250 eV. Electrons with initial energies lower than 40 eV are generated using silicon field emitter arrays with 1 mu m pitch, and accelerated towards the graphene layers supported by a silicon nitride grid biased at voltages from -20 to 200 V. We measured significant increase in current collected at the anode with the presence of graphene, which is attributed to the possible generation of secondary electrons by primary electrons impinging on the graphene membrane. Highest output current was recorded with monolayer graphene at approximately 90 eV, with up to 1.7 times the incident current. The transparency of graphene to low-energy electrons and its impermeability to gas molecules could enable low-voltage field emission electron sources, which often require ultra-high vacuum, to operate in a relatively poor vacuum environment.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据