Field Emission Characteristics of Periodically Structured Carbon Nanotube Arrays

Gorodetskiy, D. V.; Kurenya, A. N.; Гусельников, А. В.; Kanygin, M. A.; Prokhorova, S. A.; Bulusheva, L. G.; Окотруб, А. В.

doi:10.1166/jno.2013.1434

Cited by 8 publications

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“…The field emission properties of the samples were studied in a vacuum unit as described in detail in [ 18 ]. The substrate with a CNT array was placed on a movable arm (cathode) in a chamber evacuated to 10 −3 Pa. A sawtooth voltage was generated on a flat anode; the measurements were carried out at an amplitude of 0 to 1500 V.…”

Section: Methodsmentioning

confidence: 99%

“…Even small deviations in the synthesis parameters from their optimal values lead to defective CNTs and to the formation of amorphous carbon [ 16 ], the quantity of which can increase during synthesis [ 17 ]. The deposition of reaction products on the CNT surface can significantly affect the cathode emission characteristics [ 1 , 3 , 18 ]. One possible method to remove the amorphous carbon from the sample surface is by using hydrogen plasma treatment.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

et al. 2020

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Vertically aligned carbon nanotube (CNT) arrays show potential for the development of planar low-voltage emission cathodes. The characteristics of cathodes can be improved by modifying their surface, e.g., by hydrogen plasma treatment, as was performed in this work. The surface of multi-walled CNT arrays grown on silicon substrates from toluene and ferrocene using catalytic chemical vapor deposition was treated in a high-pressure (~104 Pa) microwave reactor. The structure, composition, and current-voltage characteristics of the arrays were studied before and after hydrogen plasma treatment at various power values and durations. CNT tips were destroyed and catalytic iron was released from the CNT channels. The etching rate was influenced by iron particles that formed on the array surface. The lower emission threshold in the plasma-treated arrays than in the initial sample is explained by the amplification factor of the local electric field increasing due to graphene structures of unfolded nanotube layers that formed at the CNT tips.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

et al. 2020

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“…The current from the CNT sample appear at 0.8, 1.4, 2.2 and 3.9 V/µm at the distance of 500, 300, 100 and 50 µm, respectively. Such low electric field threshold is characteristic of the arrays of aligned multiwall CNTs 40 41 42 . Increase in the threshold value with a decrease of the interelectrode distance is attributed to the change in the enhancement factor due to screening effects 37 .…”

Section: Resultsmentioning

confidence: 99%

Field emission luminescence of nanodiamonds deposited on the aligned carbon nanotube array

Fedoseeva

Bulusheva

Окотруб

et al. 2015

Sci Rep

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Detonation nanodiamonds (NDs) were deposited on the surface of aligned carbon nanotubes (CNTs) by immersing a CNT array in an aqueous suspension of NDs in dimethylsulfoxide (DMSO). The structure and electronic state of the obtained CNT–ND hybrid material were studied using optical and electron microscopy and Infrared, Raman, X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopy. A non-covalent interaction between NDs and CNT and preservation of vertical orientation of CNTs in the hybrid were revealed. We showed that current-voltage characteristics of the CNT–ND cathode are changed depending on the applied field; below ~3 V/µm they are similar to those of the initial CNT array and at the higher field they are close to the ND behavior. Involvement of the NDs in field emission process resulted in blue luminescence of the hybrid surface at an electric field higher than 3.5 V/µm. Photoluminescence measurements showed that the NDs emit blue-green light, while blue luminescence prevails in the CNT–ND hybrid. The quenching of green luminescence was attributed to a partial removal of oxygen-containing groups from the ND surface as the result of the hybrid synthesis.

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“…A distance between sample surface and a flat molybdenum anode was ∼800 μm. As we showed previously, such inter‐electrode separation allows minimizing the effect of field screening near the emitting CNT tips . The current–voltage ( I – V ) characteristics were obtained by applying a sawtooth voltage with an amplitude of up to 1500 V and frequency of 0.5 Hz.…”

Section: Methodsmentioning

confidence: 99%

Field emission properties of aligned CN_x nanotube arrays synthesized by pyrolysis of a ferrocene/acetonitrile aerosol at different temperatures

Kurenya

Bulusheva

Asanov

et al. 2015

Phys. Status Solidi B

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Nitrogen-containing carbon (CN x ) nanotubes have been grown vertically on silicon substrates by decomposition of a ferrocene/acetonitrile aerosol at temperatures 750, 800, 850, and 900 8С. A CN x nanotube array, produced at 850 8С, had the greatest height $220 mm and the smallest nitrogen content $3.8 at%. The content of graphitic nitrogen form, referred to a nitrogen atom with three carbon neighbors in a hexagonal lattice, increased gradually with the synthesis temperature. Field electron emission measurements showed that the CN x nanotube arrays have better characteristics than aligned non-doped carbon nanotubes. To reveal effect of nitrogen on the filed threshold, we calculated current-voltage dependencies for CN x nanotube models containing different amount of graphitic and pyridinic nitrogen species.Influence of the synthesis temperature on the height and total nitrogen content in CN x nanotube array and relation of these parameters with the threshold of field emission appearance.

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Field Emission Characteristics of Periodically Structured Carbon Nanotube Arrays

Cited by 8 publications

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Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

Field emission luminescence of nanodiamonds deposited on the aligned carbon nanotube array

Field emission properties of aligned CN_x nanotube arrays synthesized by pyrolysis of a ferrocene/acetonitrile aerosol at different temperatures

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Field Emission Characteristics of Periodically Structured Carbon Nanotube Arrays

Cited by 8 publications

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Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

Field emission luminescence of nanodiamonds deposited on the aligned carbon nanotube array

Field emission properties of aligned CNx nanotube arrays synthesized by pyrolysis of a ferrocene/acetonitrile aerosol at different temperatures

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Field emission properties of aligned CN_x nanotube arrays synthesized by pyrolysis of a ferrocene/acetonitrile aerosol at different temperatures