A digital miniature x-ray tube with a high-density triode carbon nanotube field emitter

Jeong, Jin-Woo; Kang, Jun-Tae; Choi, Sung-Jin; Kim, Jae-Woo; Ahn, Seungjoon; Song, Yinglin

doi:10.1063/1.4776222

Cited by 74 publications

(33 citation statements)

References 12 publications

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“…[1][2][3][4][5] During the field emission, the electrons are injected into the vacuum from the vacuum surface by quantum tunneling under certain applied external electric field. In all the ways of electron emission, this technique has attracted much attention due to its fundamental and technological requirements.…”

Section: Introductionmentioning

confidence: 99%

High performance field emission of silicon carbide nanowires and their applications in flexible field emission displays

Cui

Chen

et al. 2017

AIP Advances

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In this paper, a facile method to fabricate the flexible field emission devices (FEDs) based on SiC nanostructure emitters by a thermal evaporation method has been demonstrated. The composition characteristics of SiC nanowires was characterized by X-ray diffraction (XRD), selected area electron diffraction (SAED) and energy dispersive X-ray spectrometer (EDX), while the morphology was revealed by field emission scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). The results showed that the SiC nanowires grew along the [111] direction with the diameter of ∼110 nm and length of∼30 μm. The flexible FEDs have been fabricated by transferring and screen-printing the SiC nanowires onto the flexible substrates exhibited excellent field emission properties, such as the low turn-on field (∼0.95 V/μm) and threshold field (∼3.26 V/μm), and the high field enhancement factor (β=4670). It is worth noting the current density degradation can be controlled lower than 2% per hour during the stability tests. In addition, the flexible FEDs based on SiC nanowire emitters exhibit uniform bright emission modes under bending test conditions. As a result, this strategy is very useful for its potential application in the commercial flexible FEDs.

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Section: Introductionmentioning

confidence: 99%

High performance field emission of silicon carbide nanowires and their applications in flexible field emission displays

Cui

Chen

et al. 2017

AIP Advances

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“…Devices with high power and high efficiency can be obtained [31,32]. Furthermore, laser or LED modulated field-emitters can generate ultrashort electron bunches for pulsed X-ray sources [33,34] or even for THz and X-ray free electron lasers (FELs) [35][36][37]. The production of short electron bunches with lower emittance and higher brightness than the state-of-the-art would have consequences in a variety of scientific and industrial applications.…”

Section: Functional Field Emittermentioning

confidence: 99%

Electron field emission from nanostructured semiconductors under photo illumination

Yilmazoglu¹,

Еvtukh²,

Al-Daffaie³

et al. 2014

Turk J Phys

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New device concepts and materials for the fabrication of compact high-frequency vacuum sources and micronano-integrated X-ray sources are of particular interest for broadband communication, security screening of packages and chemical materials, biomedical examination, and other applications. This article integrates results on GaN-and ZnObased nano and self-assembled structures. They were used as field emitter tips for cold electron emission at high local electric fields as well as for photoassisted field emitters to generate bunched electrons directly from the emitter tip. The results on functional field emitters as cold electron sources will be presented. They are key elements for building, among other miniaturized vacuum tubes. Such miniaturized vacuum tubes can achieve high power at high cutoff frequencies and overcome the limitations of conventional GaAs-or InP-based solid-state devices. Furthermore, new functional X-ray sources with ultrashort pulses will allow 3D imaging with low radiation doses.

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“…[ 12,13 ] However, some critical challenges remain that hinder the successful development of such technologies. First, FE from CNTs is unstable and degrades easily at "industrial vacuum conditions" due to the adsorption of residual gas molecules, [ 14 ] preventing the use of CNTs in practical devices.…”

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confidence: 99%

Enhanced Field Emission from a Carbon Nanotube Array Coated with a Hexagonal Boron Nitride Thin Film

Yang

et al. 2015

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A high-quality field emission electron source made of a highly ordered array of carbon nanotubes (CNTs) coated with a thin film of hexagonal boron nitride (h-BN) is fabricated using a simple and scalable method. This method offers the benefit of reproducibility, as well as the simplicity, safety, and low cost inherent in using B(2)O(3) as the boron precursor. Results measured using h-BN-coated CNT arrays are compared with uncoated control arrays. The optimal thickness of the h-BN film is found to be 3 nm. As a result of the incorporation of h-BN, the turn-on field is found to decrease from 4.11 to 1.36 V μm(-1), which can be explained by the significantly lower emission barrier that is achieved due to the negative electron affinity of h-BN. Meanwhile, the total emission current is observed to increase from 1.6 to 3.7 mA, due to a mechanism that limits the self-current of any individual emitting tip. This phenomenon also leads to improved emission stability and uniformity. In addition, the lifetime of the arrays is improved as well. The h-BN-coated CNT array-based field emitters proposed in this work may open new paths for the development of future high-performance vacuum electronic devices.

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A digital miniature x-ray tube with a high-density triode carbon nanotube field emitter

Cited by 74 publications

References 12 publications

High performance field emission of silicon carbide nanowires and their applications in flexible field emission displays

High performance field emission of silicon carbide nanowires and their applications in flexible field emission displays

Electron field emission from nanostructured semiconductors under photo illumination

Enhanced Field Emission from a Carbon Nanotube Array Coated with a Hexagonal Boron Nitride Thin Film

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