Non-reactive rf treatment of multiwall carbon nanotube with inert argon plasma for enhanced field emission

Ahn, Ki Young; Kim, June-Sik; Kim, Chae Ok; Hong, Jin Pyo

doi:10.1016/s0008-6223(03)00294-x

Cited by 73 publications

(40 citation statements)

References 14 publications

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“…The plasma treatment of CNTs can result in different types of surface modification depending on plasma type and the process. The inert argon (Ar) plasma produces an efficient etching and cleaning process of CNTs [13] and can activate the surface of CNTs allowing the subsequent grafting of polymer [14,15]. The CNTs can be also coated with different plasma polymer films [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Selective Grafting of Primary Amines onto Carbon Nanotubes via Free-Radical Treatment in Microwave Plasma Post-Discharge

et al. 2012

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Abstract:A novel strategy to graft functional groups at the surface of carbon nanotubes (CNTs) is discussed. Aiming at grafting nitrogen containing groups, and more specifically primary amine covalent functionalization, CNTs were exposed under atomic nitrogen flow arising from an Ar + N 2 microwave plasma. The primary amine functions were identified and quantified through chemical derivatization with 4-(trifluoromethyl)benzaldehyde and characterized through X-ray photoelectron spectroscopy. The increase of the selectivity in the primary amines grafting onto CNTs, up to 66.7% for treatment of CNT powder, was performed via the reduction of post-treatment oxygen contamination and the addition of hydrogen in the experimental set-up, more particularly in the plasma post-discharge chamber. The analyses of nitrogenated and primary amine functions grafting on the CNT surface suggest that atomic nitrogen (N•) and reduced nitrogen species (NH• and NH 2 •) react preferentially with defect sites of CNTs and, then, only atomic nitrogen continues to react on the CNT surface, creating defects. OPEN ACCESSPolymers 2012, 4 297

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Section: Introductionmentioning

confidence: 99%

Selective Grafting of Primary Amines onto Carbon Nanotubes via Free-Radical Treatment in Microwave Plasma Post-Discharge

et al. 2012

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“…[6][7][8][9][10][11] To enhance the field emission properties of CNTs, some effective methods have been experimented. [6][7][8][9][10][11][12][13][14][15][16][17][18][19] For example, annealing in oxygen or ozone to open more ends of nanotubes 12 can enhance the field emission (FE) properties of the CNTs, because the open-end nanotubes have circular sharp edges, which may have a smaller radius of curvature than the closed-end nanotubes. Surface treatment of the as-grown CNTs with H 2 , 13 Ar, 15 16 and CF 4 (Ref.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Field Emission of CNTs Array by CO₂-Assisted Chemical Vapor Deposition

Ma²,

Tang³

et al. 2009

j nanosci nanotechnol

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We present a new process to get in-situ-growth carbon nanotubes (CNTs) array device with good FE properties by CO 2 -assisted thermal chemical vapor deposition (CVD). Field Emission measurement shows that introducing CO 2 into CNTs growth system leads to a significant enhancement in the emission properties, both the turn-on field and threshold field decrease. Raman, SEM and TEM investigation results showed that in this CO 2 -assisted thermal CVD, CO 2 can remove amorphous carbon during CNTs growth process, and at the same time, it also creates more defects on the CNTs wall. Both can enhance FE properties of the CNTs at suitable CO 2 concentrations.

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“…Nitrogen and ammonia plasmas introduce C/N functionality on carbon surface [26][27][28]. Argon plasma activates the carbon surface due to etching and ''cleaning'' processes [29][30][31]. Hydrogen plasma has been used for the cleaning of carbons to improve the SSA [28].…”

Section: Introductionmentioning

confidence: 99%

Microwave plasma assisted preparation of Pd-nanoparticles with controlled dispersion on woven activated carbon fibres

2005

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The low-pressure cold microwave (MW) plasma is shown as an efficient method to increase acidity of the ACF within less than 1 min treatment without affecting the fibre morphology and strength. The ion-exchange capacity was 1.6 times higher compared to the non-treated ACF sample. Selective removal of the carboxylic groups from the ACF surface by the air-MW-plasma allows to keep the phenolic groups intact. Palladium was deposited on ACF from [Pd(NH 3 ) 4 ]Cl 2 solution via ion-exchange with the protons of the phenolic surface groups. Surface phenolic groups were able to chemically anchor Pd in cationic form, leading after reduction in H 2 to small Pd8 nanoparticles (<3 nm). The Pd dispersion was measured by CO pulse adsorption and confirmed by the TEM analysis. Heating of the Pd/ACF catalysts in H 2 at 573-773 K is necessary to reduce Pd(II) to Pd8. This reduction can be also achieved by the H 2 -MW-plasma treatment in less than 1 min with the corresponding saving of energy. #

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Non-reactive rf treatment of multiwall carbon nanotube with inert argon plasma for enhanced field emission

Cited by 73 publications

References 14 publications

Selective Grafting of Primary Amines onto Carbon Nanotubes via Free-Radical Treatment in Microwave Plasma Post-Discharge

Selective Grafting of Primary Amines onto Carbon Nanotubes via Free-Radical Treatment in Microwave Plasma Post-Discharge

Enhancement of Field Emission of CNTs Array by CO₂-Assisted Chemical Vapor Deposition

Microwave plasma assisted preparation of Pd-nanoparticles with controlled dispersion on woven activated carbon fibres

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Non-reactive rf treatment of multiwall carbon nanotube with inert argon plasma for enhanced field emission

Cited by 73 publications

References 14 publications

Selective Grafting of Primary Amines onto Carbon Nanotubes via Free-Radical Treatment in Microwave Plasma Post-Discharge

Selective Grafting of Primary Amines onto Carbon Nanotubes via Free-Radical Treatment in Microwave Plasma Post-Discharge

Enhancement of Field Emission of CNTs Array by CO2-Assisted Chemical Vapor Deposition

Microwave plasma assisted preparation of Pd-nanoparticles with controlled dispersion on woven activated carbon fibres

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Product

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Enhancement of Field Emission of CNTs Array by CO₂-Assisted Chemical Vapor Deposition