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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.
We demonstrated a novel point-typed carbon nanotube field emitters using a triangular-shaped carbon nanotube films. We also investigated the field emission properties of the field emitters according to the tip angles. The wider field emitters exhibited higher emission current, and the field emitters with a tip angle of 120° showed extremely high emission current density over 104 A/cm2 (> 10 mA)...
We demonstrated the fabrication of point-typed field emitters by using carbon nanotube films on graphite rods and investigated their field emission properties. The field emitter showed an increased emission current and an improved long-term emission stability after edge polishing process. The highest emission current of the field emitter was increased from 2.0 mA to 4.3 mA (1.1 A/cm2). The field emitter...
We demonstrated carbon nanotube point emitters fabricated by using free standing carbon nanotube films. The point emitters showed stable and large emission current under the small applied voltage. Moreover, the emitted electrons were focused well without any focusing lens
We present field emission properties of CNT line emitters fabricated by a unique method. Two dimensional electron beam sheet was achieved by the line emitters. The CNT line emitters exhibited high emission current density over 10.7 A/cm2 at the electric field of 2.8 V/μm and excellent emission stability during 24 hr. Moreover, emission pattern showed a very low spreading angle of emitted electrons...
We present field emission properties of CNT point emitters fabricated by a unique method. The CNT point emitters exhibited high emission current up to 2.3 mA at the electric field of 1.6 V/µm and excellent emission stability during 24 h. Moreover, emission pattern showed a very low spreading angle of emitted electrons at the anode electrode. The high emission performance was attributed to the well-focused...
Flexible field emitters were fabricated with carbon nanotube (CNT) film, and their field emission properties under various bending conditions were investigated. The flexible CNT field emitters exhibited a good field emission performance. Moreover, they showed a stable and uniform emission after bending, indicating that the stress has no remarkable effect on the field emission properties of the flexible...
We demonstrated carbon nanotube (CNT) field emitters made by a filtration-transfer method. They showed low turn-on and threshold electric fields, which is attributed to the advantages of this method, such as the high density of emission sites, good electrical contact, strong mechanical adhesion, and low contamination of CNTs tips. In addition, the field emitters showed very stable emission stability...
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