A truncated-cone carbon nanotube cold-cathode electron gun

Yuan, Xuesong; Zhang, Yu; Cole, Matthew T.; Yan, Yang; Li, Xiaoyun; Parmee, Richard; Wu, Jin-Hui; Xu, Ning; Milne, W. I.; Deng, Shaozhi

doi:10.1016/j.carbon.2017.03.046

Cited by 29 publications

(16 citation statements)

References 27 publications

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“…The experimental data were obtained after 1% duty cycle continuous pulse of aging processing. A fitted emission profile was obtained by applying our fitting produce, as reported elsewhere [15,17] across the samples and the generalized Fowler-Nordheim equation [26]: J=AE 2 exp(-B/E), where A and B are 9.5116 × 10 -7 A/V 2 and 7.3849× 10 7 V/m, respectively (R 2 = 0.997). In the triode mode measurements, a maximum anode output current of 700 mA was obtained at an electric field of 8.1 kV/mm.…”

Section: Methodsmentioning

confidence: 99%

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Development of a High-Beam-Transparency Gridded Electron Gun Based on a Carbon Nanotube Cold Cathode

Chen

Yuan

et al. 2022

IEEE Electron Device Lett.

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We here report on the development of an improved dual-gridded electron gun based on a carbon nanotube cold cathode that enhances electron beam transparency and reduces grid interception and losses pathways. Compared with microscale tip Spindt-type the dual-gridded construction decreases difficulties of nanomaterial growth, fabrication and assembly. Our experimental findings show that this dual-gridded CNT electron gun can support anode output current (cathode emission current) of up to 700 mA, with a beam-transparency of up to ~100% and a compression ratio of 1/19. A beam spot of uniform brightness is obtained and the radius of the beam spot is 1.5 mm. In addition, the device could operate at 1/100 duty cycle continuous pulse with a stable current of around 100 mA during the testing time of 100 h.

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Section: Methodsmentioning

confidence: 99%

“…nanoscale, and every lower production costs [9][10][11][12][13][14][15][16]. However, several integration challenges continue to restrict the development of CNT cold cathode VERS, such as the effective and scalable integration of CNT based electron emitters into macroscopic devices [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Development of a High-Beam-Transparency Gridded Electron Gun Based on a Carbon Nanotube Cold Cathode

Chen

Yuan

et al. 2022

IEEE Electron Device Lett.

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“…Although direct emission site modelling pays an extremely significant role in producing computational tools that can approximate the emission of such multi-scalar systems, we must look towards new empirically driven approaches to capturing the emission characteristics of increasingly well established materials. Thus, in order to demonstrate the ability of CNT-based cold cathode guns for VEDs, the use of equivalent FE simulation models has been proven to be an extremely useful tool [21]. Given the CNTs' quasi-metallic nature, the basic field emission process is suitably well described by a generalized Fowler-Nordheim (FN) equation of the form:…”

Section: Methodsmentioning

confidence: 99%

“…Since the discovery of carbon nanotubes (CNTs), they have received wide attention as a promising FE cold cathodes material due to their high electrical conductivity, large aspect ratio, and excellent chemical and temporal stabilities [17]. They have unprecedented potential and have proven to be an enabling technology towards the manufacture of FE-based flat-panel displays, high-performance X-ray sources and, more recently, cold cathode VEDs [18][19][20][21][22]. As their emission current density increases significantly as the cathode size decreases, CNT based FE electron sources are very well suited for the required aggressive miniaturization needed for THz VEDs.…”

Section: Introductionmentioning

confidence: 99%

Design and Simulation of a Multi-Sheet Beam Terahertz Radiation Source Based on Carbon-Nanotube Cold Cathode

Yuan

et al. 2019

Nanomaterials

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Carbon nanotube (CNT) cold cathodes are proving to be compelling candidates for miniaturized terahertz (THz) vacuum electronic devices (VEDs) owning to their superior field-emission (FE) characteristics. Here, we report on the development of a multi-sheet beam CNT cold cathode electron optical system with concurrently high beam current and high current density. The microscopic FE characteristics of the CNT film emitter is captured through the development of an empirically derived macroscopic simulation model which is used to provide representative emission performance. Through parametrically optimized macroscale simulations, a five-sheet-beam triode electron gun has been designed, and has been shown to emit up to 95 mA at 3.2 kV. Through careful engineering of the electron gun geometric parameters, a low-voltage compact THz radiation source operating in high-order TM 5 , 1 mode is investigated to improve output power and suppress mode competition. Particle in cell (PIC) simulations show the average output power is 33 W at 0.1 THz, and the beam–wave interaction efficiency is approximately 10%.

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“…Field emission cathodes have been widely applied in a variety of vacuum electronic devices, such as electron guns 1,2 , ion sources 3,4 , X-ray sources 5,6 , microwave power sources 7,8 , parallel e-beam lithography systems 9 and flat panel displays 10,11 . Planar-type field emission cathodes have some advantages including simple structure, relatively easy fabrication process and low extraction voltage in comparison with traditional microtip-type cathodes [12][13][14][15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

Electron Emission Properties of Silicon-Rich Silicon Oxide Film Prepared by Reactive Magnetron Sputtering Deposition and Rapid Thermal Annealing

Yan

Zhao

et al. 2020

Mat. Res.

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Silicon-rich silicon oxide (SRSO) film was prepared through the deposition of SiO x film by radio-frequency reactive magnetron sputtering from a Si target and the subsequent rapid thermal annealing treatment of SiO x film, and planar-type field emission cathodes based on SRSO film were fabricated. The surface morphologies and electron emission properties of the SRSO films deposited under different O 2 /Ar flow ratios were investigated. The experimental results show that a relatively high O 2 /Ar flow ratio during the deposition of SiO x film can lead to the formation of cluster structure in the SRSO film prepared, and the electron emission efficiency of SRSO film rises with the increase of electric field applied. An SRSO-film cathode fabricated under an O 2 /Ar flow ratio of 1:1 with a chamber pressure of 0.21 Pa has an emission current density of 65.61 μA/cm 2 and a corresponding emission efficiency of 0.53% at a bias voltage of 18 V, and it exhibits relatively stable emission and fine emission uniformity.

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A truncated-cone carbon nanotube cold-cathode electron gun

Cited by 29 publications

References 27 publications

Development of a High-Beam-Transparency Gridded Electron Gun Based on a Carbon Nanotube Cold Cathode

Development of a High-Beam-Transparency Gridded Electron Gun Based on a Carbon Nanotube Cold Cathode

Design and Simulation of a Multi-Sheet Beam Terahertz Radiation Source Based on Carbon-Nanotube Cold Cathode

Electron Emission Properties of Silicon-Rich Silicon Oxide Film Prepared by Reactive Magnetron Sputtering Deposition and Rapid Thermal Annealing

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