Field emission from aligned high-density graphitic nanofibers

Chen, Yan; Patel, S.; Ye, Yagu; Shaw, D.T.; Guo, Liping

doi:10.1063/1.122397

Cited by 120 publications

(53 citation statements)

References 17 publications

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“…This value is very similar to those reported for silicon nanowires, 6 despite the physical and microstructure being completely different. A closer examination of the data shows a nonlinear curve, which has been seen and reported by others working on graphite nanofibers 10 and multiwalled carbon nanotubes. 11,12 This may be attributed to nonuniformity in the emission surface.…”

mentioning

confidence: 88%

Electron field emission from excimer laser crystallized amorphous silicon

Tang¹,

Silva²,

Boskovic³

et al. 2002

Applied Physics Letters

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We show field emission from excimer laser crystallized ͑ELC͒ hydrogenated amorphous silicon (a-Si:H) at current densities and threshold fields suitable for display applications. The laser crystallized a-Si:H gives rise to a densely packed and relative sharp surface morphology that gives emission currents of the order of 10 Ϫ5 A ͑current densitiesϷ0.04 A/cm 2 ͒ at threshold fields less than 15 V/m in a diode configuration, without the need for a forming process. With the progress in utilizing ELC in flat panel driver electronics, a fully integrated field emission display on a single glass substrate can now be envisaged.

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mentioning

confidence: 88%

Electron field emission from excimer laser crystallized amorphous silicon

Tang¹,

Silva²,

Boskovic³

et al. 2002

Applied Physics Letters

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“…Also, there are conflicting observations for the need of ammonia during synthesis of aligned CNF with some researchers proposing that ammonia is required only for the initial stage of synthesis [23] while some others proposing that ammonia is required during synthesis [56,61,64]. There are very few reports of aligned CNF on bulk nickel metal either with [60] or without ammonia [65]. However, these researchers used plasmaenhanced CVD at low pressures of 1-20 torr.…”

Section: Effects Of Ammonia In Synthesis Gasmentioning

confidence: 99%

Carbon Nanofiber Synthesis within 3-Dimensional Sintered Nickel Microfibrous Matrices: Optimization of Synthesis Conditions

Karwa

Davis

Tatarchuk

2012

Journal of Nanotechnology

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This study focuses on the process of optimization for carbon nanofiber synthesis at the exterior and the interior of 3-dimensional sintered nickel microfibrous networks. Synthesis of carbon nanofibers (CNF) by catalytic decomposition of acetylene (ethyne) was conducted at atmospheric pressure and short reaction times (10 min). Two factors evaluated during the study were (a) CNF quality (observed by SEM and Raman spectroscopy) and (b) rate of reaction (gravimetrically measured carbon yield). Independent optimization variables included redox faceting pretreatment of nickel, synthesis temperature, and gas composition. Faceting resulted in an 8-fold increase in the carbon yield compared to an untreated substrate. Synthesis with varying levels of hydrogen maximized the carbon yield (9.31 mg C/cm 2 catalyst). The quality of CNF was enhanced via a reduction in amorphous carbon that resulted from the addition of 20% ammonia. Optimized growth conditions that led to high rates of CNF deposition preferentially deposited this carbon at the exterior layer of the nickel microfibrous networks (570 • C, 78% H 2 , 20% NH 3 , 2% C 2 H 2 , faceted Ni.). CNF growth within the 3-dimensional nickel networks was accomplished at the conditions selected to lower the gravimetric reaction rate (470 • C, 10% H 2 , 88% N 2 , 2% C 2 H 2 , nonfaceted Ni).

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“…The sample was negatively biased relative to the cathode in the range 25-40 V. This allowed extracting a constant ionic beam that impinged the surface of the sample. The literature provides some other references of similar set up for carbon film growth [19][20][21][22][23][24][25][26][27][28][29][30][31][32]. It was shown elsewhere that the nature and the morphology of the nanostructures either grown or redeposited after sputtering and etching was strongly affected by the ammonia concentration in the gas mixture, by the nature, the thickness and the mode of deposition of the TM (either Fe or Co) [33].…”

Section: Graphitic Carbon Depositionmentioning

confidence: 99%

A comparative study of the field emission properties of aligned carbon nanostructures films, from carbon nanotubes to diamond

Normand

Cojocaru

Fleaca

et al. 2007

Eur. Phys. J. Appl. Phys.

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Abstract. The electron field emission properties of different graphitic and diamond-like nanostructures films are compared. They are prepared in the same CVD chamber on SiO2/Si(100) and Si(100) flat surfaces, respectively. These nanostructures are thoroughly characterized by scanning electron emission (SEM), transmission electron microscopy (TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES). Films of dense aligned carbon nanotubes by far display the lowest threshold fields around few V/µm and the largest emission currents. Carbon nanofibers, with platelet arrangement of the graphitic planes parallel to the substrate, exhibit higher emission thresholds around 10 V/µm. Diamond nanostructures, either modified through ammonia incorporation within the gas phase or not, exhibit the largest emission threshold around 25 V/µm. The high enhancement factors, deduced from the Fowler-Nordheim plots, can explain the low emission thresholds whereas limitations to the electron transport ever occur through different processes (i) surface modifications of the surface, as the transformation of the SiO2 barrier layer into SiNx in the presence of ammonia evidenced by XPS; (ii) different orientation of the graphitic basal planes relative to the direction of electron transport (carbon nanofiber) and (iii) presence of a graphitic nest at the interface of the carbon nanostructure and the substrate, observed when catalyst is deposited through mild evaporation.

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Field emission from aligned high-density graphitic nanofibers

Cited by 120 publications

References 17 publications

Electron field emission from excimer laser crystallized amorphous silicon

Electron field emission from excimer laser crystallized amorphous silicon

Carbon Nanofiber Synthesis within 3-Dimensional Sintered Nickel Microfibrous Matrices: Optimization of Synthesis Conditions

A comparative study of the field emission properties of aligned carbon nanostructures films, from carbon nanotubes to diamond

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