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Vacuum micro/nano electronic devices possess merits of radiation hardness, temperature tolerance, high working frequency and output power. It's regarded as the promising candidates for the application on ultra-high speed transistor [1, 2], portable and fast-switch X-ray source [3], free electron laser [4], field emission display [5] and so on. In the developing of modern vacuum electronic, to achieve...
Carbon nanotube (CNT) is a type of ideal cathode materials for field emission (FE) devices. Its outstanding field emission properties can be attributed to high field enhancement on the tip due to its large aspect ratio. Early works reported that the field enhancement of CNTs in an array is strongly suppressed due to the screening effect. Further study confirmed that to avoid the screening effect,...
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