Optimization of multi-tip field emission electron source

Егоров, Н. В.; Almazov, A. A.

doi:10.1016/s0042-207x(98)00302-9

Cited by 19 publications

(5 citation statements)

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“…The effect of screening electric field by the dense arrangement of CNTs has been reported by several groups. [3][4][5] The density of CNTs determines the emission site density (ESD). If the CNTs are too closely spaced, the electric field is screened out.…”

Section: Introductionmentioning

confidence: 99%

Effects of High-Density Oxygen Plasma Posttreatment on Field Emission Properties of Carbon Nanotube Field-Emission Displays

Juan

Tsai

Chen

et al. 2005

Jpn. J. Appl. Phys.

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The effects of oxygen plasma posttreatment (PPT) on the morphology and field emission properties of carbon nanotube (CNT) arrays grown on silicon substrates are proposed and experimental results are reported. Oxygen PPT led to an enhancement in the emission properties of CNTs, which showed an increase in total emission current density and a decrease in turn-on field after plasma treatment. Scanning electron microscopy (SEM) images showed reduced densities of the CNTs, which resulted in a decrease of the screening effect in the electric field. Raman spectra showed an increase in the number of defects which served as field-emission sites when the plasma power or treatment time with the plasma increased. Transmission electron microscopy (TEM) images were used to identify the quality of the nanotubes, so that we could clearly find evidences of improvement in the field emission properties after plasma treatment. The measurement of electrical characteristics revealed improved field emission properties under proper plasma conditions. The turn-on field decreased from 4.8 to 2.5 V/µm, and the emission current density increased from 78.7 µA/cm2 to 18 mA/cm2 at an applied field of 5.5 V/µm.

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Section: Introductionmentioning

confidence: 99%

Effects of High-Density Oxygen Plasma Posttreatment on Field Emission Properties of Carbon Nanotube Field-Emission Displays

Juan

Tsai

Chen

et al. 2005

Jpn. J. Appl. Phys.

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“…The enhancement factor is very depended on the aspect ratio and shape of the nanowires tips as well as the interspace distances between the nanowires. The effects of these structural parameters on the induced local electric fields between the two parallel plates were studied by these authors and reported previously [22][23][24][25][26][27][28][29][30][31]. Devices were designed considering gold, silver, and semiconductor ZnO as the materials for the nanowires.…”

Section: Simulation Resultsmentioning

confidence: 99%

Design, modeling and simulation of a miniaturized gas ionization sensor: Optimization of the structure and operation

Chivu

Kahrizi

2012

2012 IEEE International Conference on Industrial Technology

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Gas ionization sensor (GIS), made of two parallel plates, works on measuring the breakdown voltage of gases that is unique for each gas. The gas breakdown inside the gas chamber occurs due to the ionization of gas molecules by accelerated electron impacts. The acceleration of electrons is very depended on the effective electric field they experience. It is shown that metallic or semiconductor nanowires grown between the two plates improve the sensitivity of the device and breakdown voltages of the gases are considerably reduced. In this work we report the design, modeling, and simulation of a miniaturized GIS based on nanowires. We have developed simulating software based on an open source simulator XOOPIC. The simulation tool is based on combined Particle-In-Cell and Monte-Carlo-Collision approaches. The tool is developed to model and simulate the gas ionization sensor to detect various gases including greenhouse gases with optimized breakdown voltages.

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“…The first people to have used line-charge arguments in FE seem to have been Vibrans [53,54] and Egorov and coworkers [121]. They have been used extensively in the work of Harris et al (e.g.…”

Section: Line-charge Modelsmentioning

confidence: 99%

Field emitter electrostatics: a review with special emphasis on modern high-precision finite-element modelling

Assis

Dall’Agnol

Forbes

2022

J. Phys.: Condens. Matter

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This review of the quantitative electrostatics of ﬁeld emitters, covering analytical, numerical and “ﬁtted formula” approaches, is thought to be the ﬁrst of its kind in the 100 years of the subject. The review relates chieﬂy to situations where emitters operate in an electronically ideal manner, and zero-current electrostatics is applicable. Terminology is carefully described and is “polarity independent”, so the review applies to both ﬁeld electron and ﬁeld ion emitters. It also applies more generally to charged, pointed electron-conductors—which exhibit the “electrostatic lightning-rod eﬀect”, but are poorly discussed in general electricity and magnetism literature. Modern electron-conductor electrostatics is an application of the chemical thermodynamics and statistical mechanics of electrons. In related theory, the primary role of classical electrostatic potentials (rather than ﬁelds) becomes apparent. Space and time limitations have meant the review cannot be comprehensive in both detail and scope. Rather, it focuses chieﬂy on the electrostatics of two common basic emitter forms: the needle-shaped emitters used in traditional projection technologies; and the post-shaped emitters often used in modelling large-area multi-emitter electron sources. In the post-on-plane context, we consider in detail both the electrostatics of the single post and the interaction between two identical posts that occurs as a result of electrostatic depolarization (often called “screening” or “shielding”). Core to the review are discussions of the “minimum domain dimensions” method for implementing eﬀective ﬁnite-element-method electrostatic simulations, and of the variant that leads to very precise estimates of dimensionless ﬁeld enhancement factors (error typically less than 0.001 % in simple situations where analytical comparisons exist). Brief outline discussions, and some core references, are given for each of many “related considerations” relevant to the electrostatic situations, methods and results described. Many areas of ﬁeld emitter electrostatics are suggested where further research and/or separate mini-reviews would probably be useful.

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Optimization of multi-tip field emission electron source

Cited by 19 publications

References 0 publications

Effects of High-Density Oxygen Plasma Posttreatment on Field Emission Properties of Carbon Nanotube Field-Emission Displays

Effects of High-Density Oxygen Plasma Posttreatment on Field Emission Properties of Carbon Nanotube Field-Emission Displays

Design, modeling and simulation of a miniaturized gas ionization sensor: Optimization of the structure and operation

Field emitter electrostatics: a review with special emphasis on modern high-precision finite-element modelling

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