Growth and field emission study of a monolithic carbon nanotube/diamond composite

Varshney, Deepak; Weiner, Brad R.; Morell, Gerardo

doi:10.1016/j.carbon.2010.05.025

Cited by 53 publications

(32 citation statements)

References 38 publications

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“…5 al. 30 have fabricated a diamond and CNT composite structure and observed low E T and high I E characteristics during field emission measurement. They have suggested that CNTs have a high aspect ratio and during field emission heat is produced in CNTs.…”

Section: (A) the Visible (5145 Nm)mentioning

confidence: 99%

Structural and Electronic Characterization of Nanocrystalline Diamondlike Carbon Thin Films

Dwivedi

Kumar²,

Tripathi³

et al. 2012

ACS Appl. Mater. Interfaces

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The origin of low threshold field emission (threshold field 1.25 V/μm) in nanocrystalline diamond-like carbon (nc-DLC) thin films is examined. The introduction of nitrogen and thermal annealing are both observed to change the threshold field and these changes are correlated with changes to the film microstructure. A range of different techniques including micro-Raman and infrared spectroscopy, X-ray diffraction, electron microscopy, energy dispersive X-ray analysis and time of flight-secondary ion mass spectroscopy are used to examine the properties of the films. A comparison of the field emission properties of nc-DLC films with atomically smooth amorphous DLC (a-DLC) films reveals that nc-DLC films have lower threshold fields. Our results show that nc-DLC can be a good candidate for large area field emission display panels and cold cathode emission devices.

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Section: (A) the Visible (5145 Nm)mentioning

confidence: 99%

Structural and Electronic Characterization of Nanocrystalline Diamondlike Carbon Thin Films

Dwivedi

Kumar²,

Tripathi³

et al. 2012

ACS Appl. Mater. Interfaces

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“…[1][2][3][4][5][6][7][8] One of the most promising applications of CNTs is in field-emission devices, [9][10][11][12][13][14] which is enabled by their extremely high aspect ratio, tremendous mechanical strength, and remarkable electrical and thermal conductivities. 15,16 Efforts have been made to improve scalable CNT-based field-emission devices, but many structural aspects that play significant roles in such devices have yet to be explored, e.g., a more suitable substrate to support CNT emitters.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Field-Emission Performance from Carbon Nanotube Emitters on Nickel Foam Cathodes

Song

Han

et al. 2016

Journal of Elec Materi

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We present a three-dimensionally configured cathode with enhanced fieldemission performance formed by combining carbon nanotube (CNT) emitters with a nickel foam (NiF) substrate via a conventional screen-printing technique. The CNT/NiF cathode has low turn-on electric field of 0.53 V lm À1 (with current density of 10 lA cm À2 ) and threshold electric field of 0.87 V lm À1 (with current density of 0.1 mA cm À2 ), and a very high field enhancement factor of 1.4 9 10 4 . The porous structure of the NiF substrate can greatly improve the field-emission properties due to its large specific surface area that can accommodate more CNTs and increase the emitter density, as well as its high electrical and thermal conductivities that facilitate current transition and heat dissipation in the cathode. Most importantly, the local electric field was also enhanced by the multistage effect resulting from the rough metal surface, which furthermore leads to a high field enhancement factor. We believe that this improved field-emission performance makes such cathodes promising candidates for use in various field-emission applications.

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“…4 By using vacuum arc discharge, fully ionized carbon plasma with controllable energy and flux are deposited on the nanostructures, where amorphous diamond-like carbon (DLC) has been reported to grow on top, resulting in enhanced mechanical strength. [5][6][7][8][9][10] In DLC films, carbon atoms are bonded together mainly in the form of sp 2 and sp 3 hybridizations. Because DLC films are well known for their high hardness and high elastic modulus, they are utilized in a wide range of applications to improve properties such as high wear resistance, chemical inertness, high electrical resistivity, and low friction coefficients.…”

Section: Introductionmentioning

confidence: 99%

Conditions for forming composite carbon nanotube-diamond like carbon material that retain the good properties of both materials

Ren

Iyer

Koskinen

et al. 2015

Journal of Applied Physics

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Gold nanoparticle formation in diamond-like carbon using two different methods: Gold ion implantation and codeposition of gold and carbon J. Appl. Phys. 112, 074312 (2012) Carbon nanotubes are of wide interest due to their excellent properties such as tensile strength and electrical and thermal conductivity, but are not, when placed alone on a substrate, well resistant to mechanical wear. Diamond-like carbon (DLC), on the other hand, is widely used in applications due to its very good wear resistance. Combining the two materials could provide a very durable pure carbon nanomaterial enabling to benefit from the best properties of both carbon allotropes. However, the synthesis of high-quality diamond-like carbon uses energetic plasmas, which can damage the nanotubes. From previous works it is neither clear whether the quality of the tubes remains good after DLC deposition, nor whether the DLC above the tubes retains the high sp 3 bonding fraction. In this work, we use experiments and classical molecular dynamics simulations to study the mechanisms of DLC formation on various carbon nanotube compositions. The results show that high-sp 3 -content DLC can be formed provided the deposition conditions allow for sidewards pressure to form from a substrate close beneath the tubes. Under optimal DLC formation energies of around 40-70 eV, the top two nanotube atom layers are fully destroyed by the plasma deposition, but layers below this can retain their structural integrity. V C 2015 AIP Publishing LLC.

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Growth and field emission study of a monolithic carbon nanotube/diamond composite

Cited by 53 publications

References 38 publications

Structural and Electronic Characterization of Nanocrystalline Diamondlike Carbon Thin Films

Structural and Electronic Characterization of Nanocrystalline Diamondlike Carbon Thin Films

Enhanced Field-Emission Performance from Carbon Nanotube Emitters on Nickel Foam Cathodes

Conditions for forming composite carbon nanotube-diamond like carbon material that retain the good properties of both materials

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