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We report a carbon nanotube (CNT) field emission electron gun for traveling-wave tube (TWT), in which a patterned CNT bundle array grown by microwave plasma enhanced chemical vapor deposition was employed as electron source with a maximum electron current density of 4.5A/cm2. A dual focus lens was designed to achieve a 3.3∶1 compress ratio in diameter of electron beam and very small convergence angle...
A growing number of one-dimensional nanomaterials including nanotubes, nanorods and nanowires have been synthesized and found to give attractive field electron emission performance. Field emission from a two-dimensional (2D) regime is emerging as new hot topic, due to graphene can offer ones such opportunity, and its open surface and sharp edge may be beneficial for field emission. Two-dimensional...
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