Abstract

Carbon nanotubes (CNTs) have attractable field emission properties that make them promising materials for application in vacuum electronics as cold cathode devices. CNTs have several superior characteristics, such as high aspect ratio, high thermal conductivity, and low chemical reactivity [1]. The CNTs have excellent properties as electron emitters for X-ray generation such as can make compact structure, reduction of power consumption, robustness, active control of emission site, and not or less need of focus electrode. Especially, the focal spot size of electron beam at the anode target and the high anode current is key point for high resolution and low dosage of X-ray source[2]. The diameter of focal spot size can be controlled by simple process. The growth area can be controlled with simple Cr protection layer formation, resulting electron emission modulation

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