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The Ni NCs were formed on a large area of the substrate of a 4-inch wafer. The field emission measurement of the plain NCs and patterned NCs reveals that the turn-on field is for patterned NC arrays (3.23 V/μm) is lower than that for plain NCs (3.93 V/μm) while the field enhancement factor for patterned NC arrays (2963) is greater than for plain NCs (1139). Our approach to form patterned Ni NCs involves...
We have investigated the probable origin of instable emission behaviour for various types of cold emitters based on CVD carbon layers, CNT and Al2O3/ITO glass. Of them, CNT-based cold emitters have been accepted to be most appropriate for the promising applications such as displays, flat lamps, signage boards and back-light unit (BLU) including local dimming function. Although planar field emission...
A planar X-ray source using gated CNT (Carbon nanotube) emitters has been developed. Clear X-ray transmission images were taken with its applied X-ray source. In the diode structure measurement, the turn-on electric field of the CNT emitter was about 1.2 V/μm. In the triode structure measurement, characteristic X-ray peaks of Cu and the Bremsstrahlung were observed. The maximum energies of the Bremsstrahlung...
The peculiarities of electron field emission from Si cathodes with Si and SiGe nanoclusters have been investigated in details. To form Si nanoclusters on the flat surface or Si tips the LP CVD, IPS, or thermal evaporation methods were used for deposition of initial silicon enriched SiOx (x≤1.5) films in the thickness range 2–10 nm. In some cases the amorphous ultrathin Si film has been deposited....
For the next generation x-ray imaging system, small focal spot combined with fast switching electron emitter is desired to obtain high resolution images and minimize motion-induced blurring of images of moving organs such as the heart. Carbon nanotubes (CNTs) have the potential to be excellent emitters for novel x-ray imaging applications that overcome the limitations imposed by conventional thermal...
In a gate-structured field emission display (FED), the insulator layer is used to keep an electrical insulation between the gate and cathode electrode. The reliability of the insulator layer is an important issue of FED fabrication, especially for large area device. In this study, the insulator layer was prepared using plasma enhanced chemical vapor deposition (PECVD) and the preparation parameters...
Field emission characteristics of tungsten oxide (W18O49) nanowires under different temperature was investigated. The results show that the field emission currents increase with increasing temperature. Sharp increase of current was observed in the range from 473K to 673K. A mechanism based on defect-assisted emission process was used to explain the observed phenomena.
This paper reports the characteristic field emission (FE) properties of single-walled carbon nanotubes (SWNTs) synthesized on the inside pores of a porous silicon (PS) substrate, as well as on the top surface of a PS substrate. Their turn-on fields and emission current densities are measured and compared with those of other types of SWNTs in similar environments. Investigation of field emission properties...
We have synthesized carbon nanowalls (CNWs) on Si substrate by inductively/capacitively coupled plasma enhanced chemical vapor deposition (ICP/CCP-PECVD). The shape and density of CNWs are controlled by adjusting the synthesis parameters. Local field emission measurements of Ø 30 μm spots reproducibly yielded stable current up to 1 μA. Integral pulsed measurements results on the unstructured cathodes...
Carbon nanotube (CNT) emitters are utilized for field emission x-ray source. The quality of the x-ray images is the main concern when improving the geometrical parameters involved in the construction of an x-ray source. These geometrical parameters includes among others the gaps between the parts of the field emission structure, the thickness of each material, the shape of each material and the geometrical...
InP/ZnSe/ZnS muitishell colloidal quantum dots (QDs) with high quantum yield were prepared by convenient heating-up method for a light emission layer of transparent QD light-emitting diodes (QD-LEDs). The synthesized InP/ZnSe/ZnS multishell QDs exhibited an emission peak at 545 nm for clear green color with a full-width at half-maximum (FWHM) of 50 nm, and photoluminescent quantum yield (QY) of 40...
Field emission properties of various carbon nanostructures, including carbon nanotube (CNT) films, graphene, amorphous graphene and CNT/graphene composite films are investigated and compared. The crystallinity and surface morphology both play important role in field emission of nano-carbon materials.
Field emission electron source can be used in display devices, microwave amplifier, X-ray tubes, and etc. However, the electron current has to be large enough and modulated and well in these applications. In this paper, the single layer or double layer grapheme oxide sheets were used in the surface-conducted field emission electron source. Finally, both the field emission current has been improved...
A cathode material of a low work function is needed to achieve a high performance electron source. We measured the work function of W(100) surface modified with Sc2O3 by using of photoemission electron microscope. The work function of Sc-oxide/W(100) surface is measured to be 2.5eV.
We studied the fabrication of small area CNT emitters using resist-assisted patterning (RAP) process. CNT emitters grown on silicon substrate achieve higher emission current over 40 mA in the dimension of 7.8 × 10−2 cm2 with current density over 500 mA/cm2. However, with small area (200 × 500 μm2 elliptical shape) CNT emitters, we can achieve the most highest emission current density of 10 A/cm2 and...
We suggest a novel gate structure, Focusing-Functional Gate (FFG), having a focusing effect on the electron beams from the carbon nanotube (CNT) emitters for the miniature X-ray tubes. The FFG induced field emission from the CNT emitters and focused electron beams into the anode target without an additional focusing electrode, resulting in a small focal spot with little charging at the insulating...
The purpose of the present study is to examine the feasibility of a high brightness and high beam current electron gun with an elongated lifetime from perspective of computer simulation. We propose a novel electron gun system with LaB6 cathode which is operated at Schottky emission mode under slightly lower temperature condition than that typically used for thermionic emission mode. The design of...
In this paper, the low-cost sol-gel method was adopted to prepare transparent uniform Nano-diamond films on large areas of ITO glass. The mixture of Nano-graphite and organic vehicles doped to nano-diamond paste. After fabricating paste, the Nano-diamond was further ultrasonic dispersed. Through test a variety different content proportion of Nano-diamond paste, the best suitable paste proportion was...
Carbon nanotube is a promising electron source due to its excellent field emission performance. However, most of the field emission experiments for CNTs were performed at a fixed temperature. In this work, a thermal-assisted field emission of screen printed carbon nanotube cathode was investigated. It is found that the field emission properties of the CNTs cathode, such as turn-on field and the field...
Fringelike electron emission patterns from Pt nanocrystalline field emitters fabricated by electron beam induced deposition (EBID) were observed. The electron emission sites were, further, observed by field ion microscopy, showing adjacent two emission sites within a diameter of a Pt nanocrystal. These results indicate that the origin of the fringelike electron emission patterns of Pt field emitters...
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