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We reported fabrication and field emission properties of carbon nanotube (CNT) field emitters which indicated the point-type CNT film emitter and line-type CNT film emitter. The CNT film field emitters were made by cutting CNT film using a razor. The CNT film emitters showed good emission properties such as the low turn-on field, the high emission current in a triode configuration. Especially, the...
The cold cathode x-ray source was fabricated by using the point-type CNT film emitter. The CNT x-ray source consists of the CNT point emitter, the metal mesh gate electrode and the tungsten target anode electrode. Those components were mounted in a small vacuum chamber. The fabricated CNT x-ray source shows a high resolution x-ray image at a low anode current and at a low anode voltage compared to...
We fabricated the point-type CNT emitter for cold cathode x-ray source applications. The CNT point emitter was made by CNT film with a triangular tip shape, which was clamped using two stainless steel plates. Electrical properties of the point-type CNT emitter measured in triode structure showed the low turn-on and threshold electric fields, the high emission current and relatively high electron transmittance...
Field emission properties of boron nitride (BN) nanomaterials have been studied for years to apply it at harsh ambient condition. However, the field emitters fabricated using the BN nanomaterials have limitations to utilize it as field emission devices due to their poor emission performances. Here, we report much enhanced field emission properties of the BN nanomaterial with low turn-on electric field,...
A sheet electron beam source is demonstrated using a line-shape carbon nanotube (CNT) field emitter. The line-shape CNT field emitter shows large emission current under the small applied voltage. Moreover, the emitted electron is well-confined without any focusing lens.
Point-type carbon nanotube (CNT) field emitters have attracted much interest because they can promise a focused electron beam spot with a high emission current. The point-type CNT field emitters can be used for diverse applications such as x-ray tubes, electron beam sources and microwave sources. Here, we report fabrication and emission performance of various point-type field emitters made by CNTs.
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