Field Emission Properties of Disordered and Partially Ordered Nano Clustered Carbon Films

1997 ◽  
Vol 498 ◽  
Author(s):  
B. F. Coll ◽  
J. E. Jaskie ◽  
J. L. Markham ◽  
E. P. Menu ◽  
A. A. Talin ◽  
...  
Keyword(s):  
Field Emission ◽  
Defect Density ◽  
Carbon Films ◽  
Threshold Field ◽  
Field Emission Properties ◽  
Tetrahedral Amorphous Carbon ◽  
Site Density ◽  
Field Emission Displays ◽  
Emission Threshold ◽  
Nitrogen Doped Carbon

ABSTRACTThe fabrication of an efficient cold cathode emitter from carbon is based on a combination of material properties, which must be carefully tailored during deposition. We present the electron emission characteristics of several carbon films deposited by cathodic arc evaporation, and their correlation with the chemical composition, microtexture and microstructure of the films. The emission threshold field voltage, emission site density, uniformity and stability of both tetrahedral amorphous carbon, nitrogen doped carbon and nanoclustered carbon films will be reviewed. We will also address issues related to the deposition method, such as substrate temperature, defect density and scalability, in connection with requirements for the fabrication of field emission displays.

Enhanced Electron Field Emission from Carbon Nanotube Matrices

2011 ◽  
Vol 1283 ◽  
Author(s):  
Archana Pandey ◽  
Abhishek Prasad ◽  
Yoke Khin Yap ◽  
Mark Engelhard ◽  
Chongmin Wang
Keyword(s):  
Carbon Nanotube ◽  
Electric Field ◽  
Work Function ◽  
Field Emission ◽  
Threshold Field ◽  
Screening Effect ◽  
Emission Properties ◽  
Site Density ◽  
Low Emission ◽  
Emission Threshold

ABSTRACTField emission from as-grown carbon nanotube (CNTs) films often suffered from high threshold electric field, and low emission site density due to screening effects. These problems can be resolved by patterned growth of CNTs on lithographically prepared catalyst films. However, these approaches are expensive and not applicable for future emitting devices with large display areas. Here we show that as-grown CNTs films can have low emission threshold field and high emission density without using any lithography processes. We have reduced screening effects and work function of as-grown CNTs films and created the novel CNT matrices by addition of vapor- and/or liquid- phase deposition. Furthermore, these CNT matrices can continuous emit electrons for 40 hours without significant degradation. The fabrication of our CNT matrices is described as follows. First, CNT films were grown by plasma-enhanced chemical vapor deposition. These vertically-aligned multiwalled carbon nanotubes (VA-MWCNTs) are having typical length and diameter of 4 microns and 40 nm, respectively. Spacing between these CNTs is ~80 nm in average, leading to poor emission properties due to the screening effect. These as-grown samples were then subjected to the deposition of strontium titanate (SrTiO3) by pulsed-laser deposition to reduce both the work function and screening effect of CNTs. The emission properties of these coated samples can be further improved by fully filled the spaces between VA-MWCNTs by poly-methyl metha acrylate (PMMA). The field emission threshold electric field was decreased from 4.22 V/μm for as-grown VA-MWCNTs to 1.7 V/μm for SrTiO3 coated VA-MWCNTs. The addition filling with PMMA and mechanical polishing can further reduce the threshold to 0.78V/μm for the so called PMMA-STO-CNT matrices. Long term emission stability and emission site density were also enhanced.

Field Emission Site Densities of Nanostructured Carbon

2001 ◽  
Vol 675 ◽  
Author(s):  
J B Cui ◽  
J Robertson ◽  
W I Milne
Keyword(s):  
Field Emission ◽  
Applied Field ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Carbon Films ◽  
Vacuum Arc ◽  
Nanostructured Carbon ◽  
Field Emission Properties ◽  
Site Density ◽  
Enhancement Factors

ABSTRACTThe field emission properties of nanostructured carbon films deposited by cathodic vacuum arc in a He atmosphere have been studied by measuring the emission currents and the emission site density. The films have an onset field of ∼3 V/μm. The emission site density is viewed on a phosphor anode and it increases rapidly with applied field. It is assumed that the emission occurs from surface regions with a range of field enhancement factors but with a constant work function. The field enhancement factor is found to have an exponential distribution.

Annealing effects on field emission properties of tetrahedral amorphous carbon films

2001 ◽  
Vol 174 (3-4) ◽  
pp. 283-288 ◽  
Author(s):  
Y.J Li ◽  
S.P Lau ◽  
B.K Tay ◽  
Z Sun ◽  
G.Y Chen ◽  
...  
Keyword(s):  
Field Emission ◽  
Amorphous Carbon ◽  
Carbon Films ◽  
Amorphous Carbon Films ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Tetrahedral Amorphous Carbon ◽  
Annealing Effects

scholarly journals Field Emission and Nanostructure of Carbon Films

1999 ◽  
Vol 593 ◽  
Author(s):  
V. I. Merkulov ◽  
D. H. Lowndes ◽  
L. R. Baylor
Keyword(s):  
Field Emission ◽  
Chemical Vapor ◽  
Carbon Films ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Site Density ◽  
Low Emission ◽  
High Emission ◽  
Forms Of Carbon ◽  
Hot Filament

ABSTRACTThe results of field emission measurements of various forms of carbon films are reported. It is shown that the films' nanostructure is a crucial factor determining the field emission properties. In particular, smooth, pulsed-laser deposited amorphous carbon films with both high and low sp3 contents are poor field emitters. This is similar to the results obtained for smooth nanocrystalline, sp2 - bonded carbon films. In contrast, carbon films prepared by hot-filament chemical vapor deposition (HF-CVD) exhibit very good field emission properties, including low emission turn-on fields, high emission site density, and excellent durability. HF-CVD carbon films were found to be predominantly sp2 -bonded. However, surface morphology studies show that these films are thoroughly nanostructured, which is believed to be responsible for their promising field emission properties.

Electronic Structure and Field‐Emission Properties of Nitrogen‐Doped Carbon Nanotubes

2006 ◽  
Vol 14 (2-3) ◽  
pp. 151-164 ◽  
Author(s):  
A. V. Okotrub ◽  
L. G. Bulusheva ◽  
V. V. Belavin ◽  
A. G. Kudashov ◽  
A. V. Gusel'nikov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electronic Structure ◽  
Field Emission ◽  
Emission Properties ◽  
Nitrogen Doped ◽  
Field Emission Properties ◽  
Nitrogen Doped Carbon

Properties of Diamond-Like Carbon for Thin Film Microcathodes for Field Emission Displays

1996 ◽  
Vol 424 ◽  
Author(s):  
J Robertson ◽  
W I Milne
Keyword(s):  
Thin Film ◽  
Field Emission ◽  
Electron Affinity ◽  
Diamond Like Carbon ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Field Emission Displays ◽  
Chemical Inertness ◽  
Strong Candidate

AbstractDiamond-like carbon is a strong candidate for field emission microcathodes for field emission displays because of its low electron affinity and chemical inertness. The field emission properties of various types of diamond-like carbon such as a-C:H and ta-C are reviewed in the framework of a bonding model of their affinity.

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