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We demonstrated high field emission performance of carbon nanotube paste emitters, which were fabricated by using graphite filler, instead of commonly used metal or SiO2, or SiC particle fillers. The emitter with an emission area of 0.7 mm in diameter shows a highest current of 8.4 mA before electrical arcing events, corresponding to a current density of 2.2 A/cm2. The emitter shows a stable current...
We fabricated graphite nanoplatelet (GNP) field emitters using graphite adhesive and graphite rod. Comparing the field emission properties for different gap, turn-on electric field and threshold electric field were decreased almost in half, and maximum current density was increased about half as many again. The long-term emission stability also shows better results in large gap more than small gap...
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 high performance field emission of carbon nanotube (CNT) field emitters fabricated on a graphite rod. After the thermal annealing at 900 °C in vacuum ambient, the emitter showed a high emission current of 11.3 mA, corresponding to an emission current density of 5.8 A/cm2. The CNT emitter indicated a low turn-on field of 1.9 V/µm and stable emission stability at a current of 1 mA. In...
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...
Boron nitride (BN) nanomaterials have excellent electrical, chemical and mechanical properties, such as high thermal conductivity, resistant to oxidation, chemical inertness, and negative electron affinity. These unique features make BN a promising cold electron emission material. In this work, we investigated on the field emission properties from BN nanotubes (BNNTs), among the various BN allotropes...
We demonstrated field emission properties of a CNT point emitter fabricated by using CNTs on a graphite rod. The emitter has the highest current of 6.3 mA; the corresponding current density is 1.6 A/cm2. The emitter is stable at a current of 0.1 mA for 20 hours. It also showed a small and uniform emission pattern at the phosphor coated ITO glass. Our point emitter could be a good candidate for X-ray...
For application to electron field emission devices, a metal grid based on a silicon frame is introduced. Silicon frame is used to improve the thermal resistivity and electrical stability by electron beam. Silicon based micro-scale metal grid fabricated using MEMS technology.
Research activities for development of a compact and high power terahertz radiation source using a CNT cold cathode are presented. Basic principles of the proposed device and experimental challenges to realize the device are discussed.
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...
We fabricated the point emitter using a tip-treated carbon nanotube (CNT) fiber. The CNT point emitter showed the high emission current and good emission stability. It is considered that the excellent field emission properties are attributed to a large field enhancement factor caused by a large aspect ratio of the sharp tip of the point emitter and the tight binding of CNTs.
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