Electron emission from carbon fibre tips

Mousa, Marwan S.

doi:10.1016/0169-4332(95)00521-8

Cited by 27 publications

(17 citation statements)

References 11 publications

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“…For obtaining nanometersized tools, the carbon fibers were electrochemically etched. [28,29] Tools with diameters down to 100 nm were reproducibly obtained by etching in 1 m NaOH with alternating current (3.1 V pp , 50 Hz) [ Figure 1 b]. The progress of the etching process was monitored via the electrochemical current.…”

Section: Methodsmentioning

confidence: 99%

Electrochemical Machining of Gold Microstructures in LiCl/Dimethyl Sulfoxide

Bán

Schuster

2010

ChemPhysChem

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LiCl/dimethyl sulfoxide (DMSO) electrolytes were applied for the electrochemical micromachining of Au. Upon the application of short potential pulses in the nanosecond range to a small carbon-fiber electrode, three-dimensional microstructures with high aspect ratios were fabricated. We achieved machining resolutions down to about 100 nm. In order to find appropriate machining parameters, that is, tool and workpiece rest potentials, the electrochemical behavior of Au in LiCl/DMSO solutions with and without addition of water was studied by cyclic voltammetry. In waterless electrolyte Au dissolves predominantly as Au(I), whereas upon the addition of water the formation of Au(III) becomes increasingly important. Because of the low conductivity of LiCl/DMSO compared with aqueous electrolytes, high machining precision is obtained with moderately short pulses. Furthermore, the redeposition of dissolved Au can be effectively avoided, since Au dissolution in LiCl/DMSO is highly irreversible. Both observations render LiCl/DMSO an appropriate electrolyte for the routine electrochemical micromachining of Au.

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Section: Methodsmentioning

confidence: 99%

Electrochemical Machining of Gold Microstructures in LiCl/Dimethyl Sulfoxide

Bán

Schuster

2010

ChemPhysChem

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“…7 Recent studies on carbon fibres have shown that they have the capability of being powerful electron sources for some technological and microscopy applications. 8,9 Carbon-based tips also have found other applications. 10 In two recent comprehensive reviews, Forbes 11,12 illustrated the importance of carbon films and carbon-based materials and set out some relevant theory of field-induced electron emission.…”

Section: Introductionmentioning

confidence: 98%

“…13 The structure of the high-modulus carbon fibres used is explained elsewhere. 8,9,13 It seems that instabilities in the emission current from an uncoated emitter are associated with ion bombardment. The resin-coated tips are protected from direct ion bombardment, so the emission current is more stable.…”

Section: Introductionmentioning

confidence: 98%

Characteristics of carbon‐fibre cold field emission tips with a dielectric coating

Mousa

Kelly²

2004

Surface & Interface Analysis

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Field electron emitters have been prepared by coating a carbon fibre with an epoxylite resin, and their properties investigated. The emission stability is improved compared with an uncoated fibre. An optimum coating thickness of 0.2-0.3 µm has been found. Energy spectra have been measured and peak shifts of up to 1 eV as a function of emission current have been observed. Surprisingly, these peaks shifts are comparable with those found for uncoated carbon fibres and for resin-coated tungsten emitters. Their origin is not clear, but it seems that resistive drop cannot be the whole explanation. We speculate that these peak shifts may be related to the dynamics of surface-state occupation at the material/vacuum interface.

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“…Field electron emission is the emission of electrons from the surface of a cathode under the influence of a high applied electrostatic field (typically about 3 V/nm) (Forbes et al, 2004;Mousa, 1996). The field electron emitter is particularly attractive as an electron source, due to its suitable emission properties and simple operating principle .…”

Section: Introductionmentioning

confidence: 99%

Relationship of the Distribution Thickness of Dielectric Layer on the Nano-Tip Apex and Distribution of Emitted Electrons 

Al-Qudah

Mousa

2016

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This paper analyses the relationship between the distribution of a dielectric layer on the apex of a metal field electron emitter and the distribution of electron emission. Emitters were prepared by coating a tungsten emitter with a layer of epoxylite resin. A highresolution scanning electron microscope was used to monitor the emitter profile and measure the coating thickness. Field electron microscope studies of the emission current distribution from these composite emitters (Tungsten-Clark Electromedical Instruments Epoxylite resin [Tungsten/CEI-resin emitter]) have been carried out. Two forms of image have been observed: bright single-spot images, thought to be associated with a smooth substrate and a uniform dielectric layer; and multi-spot images, though to be associated with irregularity in the substrate or the dielectric layer.

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Electron emission from carbon fibre tips

Cited by 27 publications

References 11 publications

Electrochemical Machining of Gold Microstructures in LiCl/Dimethyl Sulfoxide

Electrochemical Machining of Gold Microstructures in LiCl/Dimethyl Sulfoxide

Characteristics of carbon‐fibre cold field emission tips with a dielectric coating

Relationship of the Distribution Thickness of Dielectric Layer on the Nano-Tip Apex and Distribution of Emitted Electrons

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Electron emission from carbon fibre tips

Cited by 27 publications

References 11 publications

Electrochemical Machining of Gold Microstructures in LiCl/Dimethyl Sulfoxide

Electrochemical Machining of Gold Microstructures in LiCl/Dimethyl Sulfoxide

Characteristics of carbon‐fibre cold field emission tips with a dielectric coating

Relationship of the Distribution Thickness of Dielectric Layer on the Nano-Tip Apex and Distribution of Emitted Electrons&nbsp;

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Relationship of the Distribution Thickness of Dielectric Layer on the Nano-Tip Apex and Distribution of Emitted Electrons