Emission and Processing Requirements for Carbide Films on Mo Field Emitters

1998 ◽  
Vol 509 ◽  
Author(s):  
W. A. Mackie ◽  
Tianbao Xie ◽  
M.R. Matthews ◽  
P. R. Davis
Keyword(s):  
Electron Emission ◽  
Thermionic Emission ◽  
Hydrogen Atmosphere ◽  
Field Emitter ◽  
Electron Sources ◽  
Field Emitter Arrays ◽  
Ion Thrusters ◽  
Field Emitters ◽  
Carbide Coatings ◽  
Small Spot

AbstractWe have been working for many years on electron emission and surface properties of transition metal carbides. These studies have covered field, photo, and thermionic emission from bulk carbides as well as field and photo emission from carbide coatings and films on various substrates. Thin film carbide overcoatings have also been used on field emitter arrays of both Mo and Si. These unique carbide materials have electron emission properties making them attractive candidates for several applications. Uses for these carbides include FEA video displays, microwave applications, high current and small spot electron sources (e.g. accelerators and FELs), and cold cathodes for operation at tube pressures and in poor vacuums (e.g. FEAs, vacuum detectors, and neutralizing beams for ion thrusters).We report here on one aspect of our current research which deals with electron emission of ZrC films coating single Mo field emitters. The relevant application is Spindt-type field emitter arrays. Processing steps are evaluated showing the need for a clean substrate. After deposition treatments are also investigated. Emission degradation has been noted after exposure to air and we report on successful use of a hydrogen atmosphere to reverse those adverse effects.

scholarly journals Carbon Nanotube Electron Sources: From Electron Beams to Energy Conversion and Optophononics

2014 ◽  
Vol 2014 ◽  
pp. 1-23 ◽  
Author(s):  
Alireza Nojeh
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Electron Emission ◽  
Electron Beams ◽  
Thermionic Emission ◽  
Secondary Emission ◽  
Electron Sources ◽  
Field Emitters ◽  
Electron Microscopes ◽  
Electron Emitters

Carbon nanotubes have a host of properties that make them excellent candidates for electron emitters. A significant amount of research has been conducted on nanotube-based field-emitters over the past two decades, and they have been investigated for devices ranging from flat-panel displays to vacuum tubes and electron microscopes. Other electron emission mechanisms from carbon nanotubes, such as photoemission, secondary emission, and thermionic emission, have also been studied, although to a lesser degree than field-emission. This paper presents an overview of the topic, with emphasis on these less-explored mechanisms, although field-emission is also discussed. We will see that not only is electron emission from nanotubes promising for electron-source applications, but also its study could reveal unusual phenomena and open the door to new devices that are not directly related to electron beams.

Gold Overcoatings on Spindt-Type Field Emitter Arrays

1996 ◽  
Vol 424 ◽  
Author(s):  
S. L. Skala ◽  
D. A. Ohlberg ◽  
A. A. Talin ◽  
T. E. Felter
Keyword(s):  
Electron Emission ◽  
Current Noise ◽  
Gold Deposition ◽  
Field Emitter ◽  
Emission Properties ◽  
Turn On ◽  
Field Emitter Arrays ◽  
Before And After ◽  
Emitter Array ◽  
Field Emitter Array

ABSTRACTThe electron emission properties of a Spindt-type field emitter array have been measured before and after deposition of approximately 100 Å of gold. The workfunction of the emitter decreased by 5% after gold deposition resulting in an 11% reduction in turn-on voltage. Emission stability as measured by RMS current noise improved by 40%. Improvements in emission do not withstand exposure to air. However, baking at moderate temperatures (200°C) restores the emission improvements obtained with the gold overcoating. Fowler-Nordheim plots show that the enhanced emission after baking is due to a increase of the Fowler-Nordheim intercept and not a decrease in slope. Additionally, the gold over coatings resist poisoning as a 50,000 L dose of oxygen only slightly affects emission.

Laser-induced surface cleaning of molybdenum field emitter arrays for enhanced electron emission

2003 ◽  
Vol 82 (19) ◽  
pp. 3299-3301 ◽  
Author(s):  
D. S. Seo ◽  
C. O. Kim ◽  
J. P. Hong ◽  
J. S. Shin ◽  
B. K. Song ◽  
...  
Keyword(s):  
Electron Emission ◽  
Surface Cleaning ◽  
Field Emitter ◽  
Field Emitter Arrays

scholarly journals The effect of Pd coating on electron emission from silicon field emitter arrays

2000 ◽  
Vol 87 (10) ◽  
pp. 7349-7353 ◽  
Author(s):  
Jong-Lam Lee ◽  
Sang Pyo Oh ◽  
Sang Youn Han ◽  
Seung-Youl Kang ◽  
Jin Ho Lee ◽  
...  
Keyword(s):  
Electron Emission ◽  
Field Emitter ◽  
Field Emitter Arrays ◽  
Effect Of Pd

Graphene Nanotubule Cold Field Emission Electron Sources

1994 ◽  
Vol 349 ◽  
Author(s):  
B. H. Fishbine ◽  
C. J. Miglionico ◽  
K. E. Hackett ◽  
K. J. Hendricks
Keyword(s):  
Field Emission ◽  
Current Density ◽  
High Current Density ◽  
High Current ◽  
Field Emitter ◽  
Electron Sources ◽  
Field Emitter Arrays ◽  
Emission Electron ◽  
Emitter Array ◽  
Field Emitter Array

ABSTRACTBuckytubes are considered for high current density cold field emitter array electron sources. They may provide more stable, higher-brightness emission than existing cold field emitter arrays.

Pulsed Laser Deposition of Diamond-Like Carbon Films on Gated Si Field Emitter Arrays for Improved Electron Emission

1999 ◽  
Vol 38 (Part 1, No. 12B) ◽  
pp. 7208-7212 ◽  
Author(s):  
Oguz Yavas ◽  
Takeshi Hashimoto ◽  
Naoki Suzuki ◽  
Mikio Takai ◽  
Michihiro Kobayashi ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Electron Emission ◽  
Pulsed Laser ◽  
Carbon Films ◽  
Laser Deposition ◽  
Diamond Like Carbon ◽  
Field Emitter ◽  
Field Emitter Arrays
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