Analysis of some properties of metal-glass microemitters subjected to strong electric fields

Mousa, Marwan S.; Hibbert, David Brynn

doi:10.1016/0169-4332(93)90295-m

Cited by 4 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electron emission dynamics is mostly controlled by the metal/glass interface (Mousa & Hibbert, 1993b). Our measurements show that MWNTs have high current emission.…”

Section: Discussionmentioning

confidence: 78%

“…Decreasing the applied voltage from 3,250 V to 1,000 V gave currents in the range 5.8 μA down to 9.9 pA. The shift of the emission current to lower values may occur because of surface impurities; alternatively, this shift could result from the presence of multiple emitting sites on the tip that switch on at different voltages (Mousa & Hibbert, 1993b). Studies were also carried out on a second tip (CNT-A5).…”

Section: Resultsmentioning

confidence: 99%

“…A glass tube (outside diameter=1 mm, internal diameter=0.1 mm) fits inside these bearings, between the upper and lower chucks, with a furnace loop located around it. The MWCNTs were entered into the opposite end of each glass tube so they would protrude at the tip with a wire plunger (Mousa & Hibbert, 1993b). The lower chuck spindle can slide vertically, in order to pull down the glass tube under gravity.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Switch-on Phenomena and Field Emission from Multi-Walled Carbon Nanotubes Embedded in Glass

Ali

Mousa

2016

View full text Add to dashboard Cite

“…The electron emission dynamics is mostly controlled by the metal/glass interface (Mousa & Hibbert, 1993b). Our measurements show that MWNTs have high current emission.…”

Section: Discussionmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Switch-on Phenomena and Field Emission from Multi-Walled Carbon Nanotubes Embedded in Glass

Ali

Mousa

2016

View full text Add to dashboard Cite

“…This equation uses the macroscopic field as an independent variable have often been used to describe CFE from Carbon Nanotubes (CNTs) including closed singlewalled (CNTs) of small apex radius, particularly in technological context [12]. The Nanotube tip does not necessarily behave like a metal; electrons are not completely free and the effect of the tips atomic structure can be dominant.…”

Section: Introductionmentioning

confidence: 99%

Comparison between Single-Walled CNT, Multi-Walled CNT, and Carbon Nanotube-Fiber Pyrograf III

Mousa

2018

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Influence of a dielectric coating on field electron emission from micro‐point electron sources

Mousa

2007

Surface & Interface Analysis

View full text Add to dashboard Cite

Field electron (FE) emitters may be prepared by coating a metallic emitter or a carbon-fibre emitter with a layer of dielectric material. Such 'composite' emitters are of interest for both fundamental and technological reasons, and can also be used to simulate low-macroscopic-field emission from flat thin-film emitters. This paper reviews the long-standing work aimed at characterizing and optimizing emitters of this kind, which are sometimes called 'M-I-V' or 'C-D-V' emitters.The coating materials investigated include several types of epoxylite resins, hydrocarbons, alumina, lacomit, plastics, zinc oxide, magnesium oxide, zirconium carbide and tetracyanoethylene. High-resolution electron microscopy was used to monitor the profile of the tip and to measure the coating thickness. The FE emission properties of these composite emitters were studied using both conventional field electron microscope (FEM) techniques and high-resolution FE spectroscopy techniques based on the use of a retarding potential energy analyser.There are common themes to the behaviour of these composite emitters. Characteristic emission properties include: an initial switch-on effect at threshold barrier fields of order 10 9 V/m; a subsequent I -V characteristic that gives linear Fowler-Nordheim (FN) plots at low fields of <10 8 V/m, but saturates at higher fields and may exhibit hysteresis; and an energy distribution with a width and shift that are field-dependent. The coatings can give rise to single-spot emission images, attributed to the formation of a conducting channel in the dielectric. In general, the emission stability is improved, as compared with an uncoated cathode.In the case of carbon-fibre cathodes, an optimum coating thickness of 0.2-0.3 µm has been found. Current-dependent peak shifts of up to 1 eV have been observed in the energy spectra. Surprisingly, these peak shifts are comparable with those found for uncoated carbon fibres and also for the resincoated tungsten emitters. Their origin is not clear, but it seems that resistive drop cannot provide the whole explanation. These peak shifts may be related to the dynamics of surface-state occupation at the material/vacuum interface.

show abstract

Analysis of some properties of metal-glass microemitters subjected to strong electric fields

Cited by 4 publications

References 13 publications

Switch-on Phenomena and Field Emission from Multi-Walled Carbon Nanotubes Embedded in Glass

Switch-on Phenomena and Field Emission from Multi-Walled Carbon Nanotubes Embedded in Glass

Comparison between Single-Walled CNT, Multi-Walled CNT, and Carbon Nanotube-Fiber Pyrograf III

Influence of a dielectric coating on field electron emission from micro‐point electron sources

Contact Info

Product

Resources

About