A cold cathode X-ray tube was fabricated using a carbon nanotube (CNT) field electron emitter made by free-standing CNT film which is composed of highly packed network. lot bundles with sharp tip are vertically aligned at the edge thin length 10 mm and thickness 7 μm. The presents an extremely high current density 152 A/cm2 (corresponding to 106.4 mA), beam transmittance 95.2% small focal spot size (FSS) 0.5 mm. In addition, also shows stable lifetime during 100 000 shots. High emission...

Boron nitride nanotubes (BNNTs) have attracted considerable attention as a field emission material because of their high mechanical strength, negative electron affinity, and oxidation resistance. Nevertheless, the obtained field-emission properties BNNTs indicated poor performance, which is very turn-on electric with low current. We fabricated BNNT emitters investigated properties. The were considerably enhanced compared to those other BN nanomaterial-based emitters. threshold fields emitter...

The carbon nanotube (CNT) field emitter was fabricated using a thin free-standing CNT film, indicating line-shape emitter. Field emission properties of the were investigated in both diode and triode configurations. showed low turn-on electric 1.8 V/μm high current 40.3 mA, corresponding to density 96 A/cm configuration. It also exhibited anode 40 95.2 In addition, good electron beam transmittance 86.4% excellent stability without degradation for 15 h. main reason performance our is caused by...

The field emission properties of boron nitride nanotube (BNNT) emitters according to vacuum pressure were demonstrated. During the short-term operation, behaviors almost similar, regardless pressure, even though turn-on electric BNNT emitter was slightly increased as increased. On other hand, during long-term both degradation and fluctuations current dramatically is mainly attributed ion bombardment effect, rather than oxidation effect. behavior under Ar ambient also strongly demonstrates...

The mechanical properties of silicon nitride films are investigated. Freestanding fabricated using the MEMS technique. were deposited onto (100) wafers by LPCVD (Low Pressure Chemical Vapor Deposition). Square and rectangular membranes made anisotropic etching substrates. Then bulge test for film was carried out. thickness specimens 0.5, 0.75 1μm respectively. By testing both square membranes, reliability valiant-ness with regard to shape Also considering residual stress in films, one can...

A sheet electron beam source is demonstrated using a line-shape carbon nanotube (CNT) field emitter. The CNT emitter shows large emission current under the small applied voltage. Moreover, emitted well-confined without any focusing lens.

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 BN limitations utilize as devices due their poor performances. Here, we report much enhanced nanomaterial with low turn-on electric field, high current density, and long term stability.

We fabricated the cold cathode x-ray source composed of point-type CNT field emitter, mesh gate electrode, e-beam focusing lens and W anode. The emitter was made by film with a triangular tip shape. Field emission properties measured in triode configuration showed low turn-on threshold electric fields, high current focused electron beam spot. based reveals resolution images. demonstrated that is suitable candidate for performance sources.

Graphite nanoplatelet (GNP) paste field emitters fabricated using all-carbon-based materials, such as GNPs, graphite nanoparticles, binders, and a rod substrate have been demonstrated. The GNP on the showed an emission current density of 84.3 mA/cm2 good stability with degradation rate less than 10%, indicating higher performance other emitters. enhanced emitter is attributed to low work function barrier between carbon contact resistance GNPs substrate, bulk electrical conductivity. new...

We fabricated the point-type CNT emitter for cold cathode x-ray source applications. The point was made by film with a triangular tip shape, which clamped using two stainless steel plates. Electrical properties of measured in triode structure showed low turn-on and threshold electric fields, high emission current relatively electron transmittance. sources indicated good performance, reveals resolution images at anode voltage. Our results that is very useful performance sources.

The cold cathode x-ray source was fabricated by using the point-type CNT film emitter. consists of point emitter, metal mesh gate electrode and tungsten target anode electrode. Those components were mounted in a small vacuum chamber. shows high resolution image at low current voltage compared to conventional thermionic sources. achieved performance is caused density electron beam emitted from Our results indicated that emitter very useful for based

We reported fabrication and field emission properties of carbon nanotube (CNT) emitters which indicated the point-type CNT film emitter line-type emitter. The were made by cutting using a razor. showed good such as low turn-on field, high current in triode configuration. Especially, was effective to realize an electron sheet beam with density.

We fabricated carbon nanotube (CNT) field emitters using a CNT film, which indicated the point-type film emitter, and evaluate emission properties of emitter in triode configuration. The showed good such as low turn-on field, high current stability. also investigated by adjusting angle tip film.

Point-type carbon nanotube (CNT) field emitters have attracted much interest because they can promise a focused electron beam spot with high emission current. The point-type CNT be used for diverse applications such as x-ray tubes, sources and microwave sources. Here, we report fabrication performance of various made by CNTs.

The high performance cold cathode x-ray source was fabricated by using the point-typed CNT field emitter. consists of point emitter, metal mesh gate electrode, hole focusing lens and tungsten target anode electrode. To fabricate source, such components were mounted in a SUS vacuum chamber. showed good resolution images at low current voltage, also indicated stable operation. We evaluated according to tube voltage current, respectively.

Field emission performance of boron nitride nanotube (BNNT) fabricated by simple filtration-transfer method, were evaluated according to vacuum pressure estimate its potential use for robust electron sources. Even though there is little change in the current density-electric field characteristics, stability test a relatively long time shows somewhat large degradation at over 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-5</sup> Torr. To...