Stabilized electron emission from silicon coated carbon nanotubes for a high-performance electron source

Ryu, Jae-Chun; Bae, Na Young; Oh, Hye Mi; Zhou, Otto; Jang, Jin; Park, Kyu Chang

doi:10.1116/1.3565428

Cited by 23 publications

(10 citation statements)

References 14 publications

(10 reference statements)

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“…The tip apex measured a few nanometers in diameter, and the diameter of the bottom region in contact with the substrate was equal to the pre-patterned dot area of the 3 µm island. The adhesion of conventional single CNTs onto the substrate is weak [ 12 ]. This is thought to increase the adhesion between the CNTs and the substrate, also to reduce the screening effect between emitters and adjacent emitter [ 13 ].…”

Section: Resultsmentioning

confidence: 99%

Carbon Nanotube Electron Emitter for X-ray Imaging

2012

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The carbon nanotube field emitter array was grown on silicon substrate through a resist-assisted patterning (RAP) process. The shape of the carbon nanotube array is elliptical with 2.0 × 0.5 mm2 for an isotropic focal spot size at anode target. The field emission properties with triode electrodes show a gate turn-on field of 3 V/µm at an anode emission current of 0.1 mA. The author demonstrated the X-ray source with triode electrode structure utilizing the carbon nanotube emitter, and the transmitted X-ray image was of high resolution.

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Section: Resultsmentioning

confidence: 99%

Carbon Nanotube Electron Emitter for X-ray Imaging

2012

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“…They were grown by direct current plasma-enhanced chemical vapor deposition for 60 min. The growth temperature was 630 °C, the voltage of graphite susceptor (cathode) was −620 V, and the mesh voltage was + 320 V. Acetylene (C 2 H 2 ) and ammonia (NH 3 ) gas were fed at rates of 20 sccm and 160 sccm, respectively, during the growth time [33,34]. After the growth, 1000 °C annealing was performed for 1 h in an argon gas atmosphere of 130 mTorr.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of Stable Carbon Nanotube Cold Cathode Electron Emitters with Post-Growth Electrical Aging

2018

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We fabricated carbon nanotube (CNT) cold cathode emitters with enhanced and stable electron emission properties and long-time stability with electrical aging as a post-treatment. Our CNT field emitters showed improved electrical properties by electrical aging. We set the applied bias for effective electrical aging, with the bias voltage defined at the voltage where Joule heating appeared. At the initial stage of aging, the electron emission current started to increase and then was saturated within 3 h. We understood that 5 h aging time was enough at proper aging bias. If the aging bias is higher, excessive heating damages CNT emitters. With the electrical aging, we obtained improved electron emission current from 3 mA to 6 mA. The current of 6 mA was steadily driven for 9 h.

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“…The CNTs were grown using a DC-PECVD explained in detail elsewhere [ 19 ]. For the PECVD process, rectangular rounded metal substrates with an area of 0.1377 cm 2 and width of 1.5 mm, were used to grow the CNTs as in Figure 1 a placed on a graphite susceptor.…”

Section: Methodsmentioning

confidence: 99%

Direct Synthesis of Carbon Nanotube Field Emitters on Metal Substrate for Open-Type X-ray Source in Medical Imaging

et al. 2017

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We report the design, fabrication and characterization of a carbon nanotube enabled open-type X-ray system for medical imaging. We directly grew the carbon nanotubes used as electron emitter for electron gun on a non-polished raw metallic rectangular-rounded substrate with an area of 0.1377 cm2 through a plasma enhanced chemical vapor deposition system. The stable field emission properties with triode electrodes after electrical aging treatment showed an anode emission current of 0.63 mA at a gate field of 7.51 V/μm. The 4.5-inch cubic shape open type X-ray system was developed consisting of an X-ray aperture, a vacuum part, an anode high voltage part, and a field emission electron gun including three electrodes with focusing, gate and cathode electrodes. Using this system, we obtained high-resolution X-ray images accelerated at 42–70 kV voltage by digital switching control between emitter and ground electrode.

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Stabilized electron emission from silicon coated carbon nanotubes for a high-performance electron source

Cited by 23 publications

References 14 publications

Carbon Nanotube Electron Emitter for X-ray Imaging

Carbon Nanotube Electron Emitter for X-ray Imaging

Fabrication of Stable Carbon Nanotube Cold Cathode Electron Emitters with Post-Growth Electrical Aging

Direct Synthesis of Carbon Nanotube Field Emitters on Metal Substrate for Open-Type X-ray Source in Medical Imaging

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