Vertically Aligned Carbon Nanotube Emitter on Metal Foil for Medical X-Ray Imaging

Ryu, Jae-Chun; Kim, Wansun; Lee, Seung Ho; Eom, Young Ju; Park, Hun Kuk; Park, Kyu Chang

doi:10.1166/jnn.2013.7866

Cited by 10 publications

(3 citation statements)

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“…This synthesis approach, besides having advantages like low‐temperature growth and vertical alignment of nanostructures, also offers good quality and adhesion of carbon structures to the substrates . Various substrates have been used for vertically aligned CNT (VACNTs) and CNFs growth like metals, silicon, and quartz . Direct PECVD growth of vertically oriented graphene on Au interdigitated field‐effect transistor biosensor has also been reported .…”

Section: Introductionmentioning

confidence: 99%

Plasma enhanced synthesis of N doped vertically aligned carbon nanofibers on 3D graphene

Mishra

Nguyễn

Adusei

et al. 2018

Surface & Interface Analysis

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Graphene and carbon nanotubes/fibers (CNT/CNF) hybrid structures are emerging as frontier materials for high-efficiency electronics, energy storage, thermoelectric, and sensing applications owing to the utilization of extraordinary electrical and physical properties of both nanocarbon materials. Recent advances show a successful improvement in the structure and surface area of layered graphene by incorporating another dimension and structural form-three-dimensional graphene (3DG). In this study, vertically aligned CNFs were grown using plasma enhanced chemical vapor deposition on a relatively new form of compressed 3DG. The latter was synthesized using a conventional thermal chemical vapor deposition. The resulting free-standing hybrid material is in-situ N doped during synthesis by ammonia plasma and is produced in the form of a hybrid paper. Characterization of this material was done using electrochemical and spectroscopic measurements.The N doped hybrid showed relatively higher surface area and improved areal current density in electrochemical measurements than compressed pristine 3DG, which makes it a potential candidate for use as an electrode material for supercapacitors, sensors, and electrochemical batteries.

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Section: Introductionmentioning

confidence: 99%

Plasma enhanced synthesis of N doped vertically aligned carbon nanofibers on 3D graphene

Mishra

Nguyễn

Adusei

et al. 2018

Surface & Interface Analysis

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“…Li et al synthesized CNTs on a metal alloy substrate by coating its surface with Ni before synthesis. Given that catalyst seeds, such as Ni, Cr, Fe, Co, and Mo, are needed for the nucleation of CNTs, many reports emphasize the direct growth of CNTs on metal alloy substrates such as alloys of Ni, Fe, and the Cr (NFC alloy) system [ 7 , 8 , 9 , 10 , 11 ]. By using these metal alloy substrates (with or without surface modification), separate processes involving the sputtering of the above mentioned active catalysts and/or reagents, such as HNO 3 and HCl, can be avoided.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotube Field Emitters Synthesized on Metal Alloy Substrate by PECVD for Customized Compact Field Emission Devices to Be Used in X-Ray Source Applications

et al. 2018

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In this study, a simple, efficient, and economical process is reported for the direct synthesis of carbon nanotube (CNT) field emitters on metal alloy. Given that CNT field emitters can be customized with ease for compact and cold field emission devices, they are promising replacements for thermionic emitters in widely accessible X-ray source electron guns. High performance CNT emitter samples were prepared in optimized plasma conditions through the plasma-enhanced chemical vapor deposition (PECVD) process and subsequently characterized by using a scanning electron microscope, tunneling electron microscope, and Raman spectroscopy. For the cathode current, field emission (FE) characteristics with respective turn on (1 μA/cm2) and threshold (1 mA/cm2) field of 2.84 and 4.05 V/μm were obtained. For a field of 5.24 V/μm, maximum current density of 7 mA/cm2 was achieved and a field enhancement factor β of 2838 was calculated. In addition, the CNT emitters sustained a current density of 6.7 mA/cm2 for 420 min under a field of 5.2 V/μm, confirming good operational stability. Finally, an X-ray generated image of an integrated circuit was taken using the compact field emission device developed herein.

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“…Many articles have been published reporting the several ways to improve the FE properties [ 12 , 13 ]. Most of them reported that for excellent FE, the CNTs should be grown vertically aligned on a treated, polished and patterned surface [ 14 ]. However, the patterning and polishing of the surface is time consuming and not so economic, which will ultimately make it hard for commercializing the CNT based cathode and X-ray system and make it difficult to compete with conventional filament based system in market.…”

Section: Introductionmentioning

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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Vertically Aligned Carbon Nanotube Emitter on Metal Foil for Medical X-Ray Imaging

Cited by 10 publications

References 0 publications

Plasma enhanced synthesis of N doped vertically aligned carbon nanofibers on 3D graphene

Plasma enhanced synthesis of N doped vertically aligned carbon nanofibers on 3D graphene

Carbon Nanotube Field Emitters Synthesized on Metal Alloy Substrate by PECVD for Customized Compact Field Emission Devices to Be Used in X-Ray Source Applications

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

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