Improved field emission properties from carbon nanotubes grown onto micron-sized arrayed silicon pillars with pyramidal bases

Uh, Hyung Soo; Park, Sangsik

doi:10.1016/j.diamond.2014.10.008

Cited by 12 publications

(5 citation statements)

References 23 publications

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“…The average amplitude of electronic pulses is 0.027 mA/cm 2 and the fluctuation is less than 20% on applied voltage of 50 V. More important, the emission current density is nearly zero on laser pulse-off with applied voltage of 50 V, proving that electron emissions are excited only on the condition of laser pulse-on ( 1). The preliminary results show the realization of electron emission pulses from CNT cathodes and turn-on electric field less than 0.14 V/ m (turn-on electric field is defined as the electric field required to produce a current density of 0.01 mA/cm 2 ), which is incomparable with reference to previous studies, such as CNTs on nickel foam (0.53 V/ m) [28], graphene-CNT (0.73 V/ m) [29], CNTs on silicon pillars (2.16 V/ m) [30], and multilayer graphene-CNTs (0.93 V/ m) [31]. Actually, the turn-on voltage of the CNT cathodes was about 80 V (0.23 V/ m) by field emission.…”

Section: Resultsmentioning

confidence: 73%

Electronic Pulses from Pulsed Field Emission of CNT Cathodes

Wei

Wang

et al. 2018

Journal of Nanomaterials

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We presented a demonstration of infrared laser irradiated field emission electronic pulse based on carbon nanotube (CNT) cathodes. Electronic pulses greatly depended on pulsed infrared laser and were almost synchronous with laser pulses. We have designed a pulsed field emission cathode based on CNTs and investigated correlation between electronic pulse and laser pulse, acquiring the shortest width of electronic pulses about 50 ms and turn-on field less than 0.14 V/μm. Besides, we have studied the thermal effect on the pulsed field emission of CNT cathodes caused by laser heating. Interestingly, the thermal effect has caused an enhancement of emission current but resulted in a waveform distortion on short electronic pulses. The application of laser pulses on CNT cathodes would extend conventional electron sources to a pulsed electron source and offered a possibility of pulsed field emission. These results were encouraging us to prepare further studies of ultrafast electronic pulses for high-frequency electron sources.

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Section: Resultsmentioning

confidence: 73%

Electronic Pulses from Pulsed Field Emission of CNT Cathodes

Wei

Wang

et al. 2018

Journal of Nanomaterials

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“…The thick Si pillars we fabricated can be used as substrates for the growth of carbon nanotubes 25,[32][33][34] and Cu nanolms. 26 In addition, they may also have great potential in broadband heterojunction photodetector manufacturing engineering.…”

Section: Etching Features Using Ag and Au Separatelymentioning

confidence: 99%

Co-catalytic mechanism of Au and Ag in silicon etching to fabricate novel nanostructures

et al. 2015

RSC Adv.

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“…Researchers are investigating to improve the FE uniformity and the mechanism of emitter failure of CNT arrays. For example, how to achieve a uniform FE-CNT array; how much the CNT emitter can contribute to the uniform FE performance; when the CNT emitter can be active and destroyed; and how to focus it directly [ 22 , 23 , 24 , 25 ]. Some researchers report the forest type of CNT, which is easy to pattern, less time-consuming, and inexpensive, but has many disadvantages, such as not as good field emission performance, the difficulty of focusing compared to the vertically aligned CNTs, and high screening effect [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Beam Trajectory Analysis of Vertically Aligned Carbon Nanotube Emitters with a Microchannel Plate

et al. 2022

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Vertically aligned carbon nanotubes (CNTs) are essential to studying high current density, low dispersion, and high brightness. Vertically aligned 14 × 14 CNT emitters are fabricated as an island by sputter coating, photolithography, and the plasma-enhanced chemical vapor deposition process. Scanning electron microscopy is used to analyze the morphology structures with an average height of 40 µm. The field emission microscopy image is captured on the microchannel plate (MCP). The role of the microchannel plate is to determine how the high-density electron beam spot is measured under the variation of voltage and exposure time. The MCP enhances the field emission current near the threshold voltage and protects the CNT from irreversible damage during the vacuum arc. The high-density electron beam spot is measured with an FWHM of 2.71 mm under the variation of the applied voltage and the exposure time, respectively, which corresponds to the real beam spot. This configuration produces the beam trajectory with low dispersion under the proper field emission, which could be applicable to high-resolution multi-beam electron microscopy and high-resolution X-ray imaging technology.

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Improved field emission properties from carbon nanotubes grown onto micron-sized arrayed silicon pillars with pyramidal bases

Cited by 12 publications

References 23 publications

Electronic Pulses from Pulsed Field Emission of CNT Cathodes

Electronic Pulses from Pulsed Field Emission of CNT Cathodes

Co-catalytic mechanism of Au and Ag in silicon etching to fabricate novel nanostructures

Beam Trajectory Analysis of Vertically Aligned Carbon Nanotube Emitters with a Microchannel Plate

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