Field emission of carbon-nanotube point electron source

Lim, Seong Chu; Lee, Dae Sik; Choi, Ha Kyu; Lee, Il Ha; Lee, Young Hee

doi:10.1016/j.diamond.2009.09.010

Cited by 17 publications

(10 citation statements)

References 27 publications

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“…One can note that the intensity of the relative energy increases sharply as the electric field doubles its intensity, suggesting that for higher applied electric fields more energetically favorable would be the interaction of the nanotube with the field (Table ). However, one cannot increase the electric field indefinitely, once the action of the electric charges increases, changing the coulomb interactions between the carbon atoms, which could destabilize the nanotube structure, causing even rupture of the chemical bonds . In this paper, we will work with electric fields within a range considered acceptable, so that our work would be feasible .…”

Section: Resultsmentioning

confidence: 99%

Pristine and functionalized capped carbon nanotubes under electric fields

Menezes

Mota

Zanella

et al. 2013

Physica Status Solidi (b)

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, Phone: þ55 (55) 3220 1234, Fax: þ55 (55) 3222 6484The structural and electronic properties of end-capped carbon nanotubes (CCN) functionalized by carboxyl, amine, amide, and hydroxyl chemical groups under the action of electric fields are investigated through first-principles simulations based on density functional theory. Changes in the original properties of the functionalized capped nanotubes are observed due to the application of external electrical fields and the responses for different intensities are shown to be nonlinear. It is demonstrated that there are optimum values for the electric field to obtain the most stable binding energies for the studied systems. In all cases, the energy levels are rearranged to stabilize the systems and electric dipole moments are induced toward the incident electric field. It is also shown that these electric dipole moments generate polarized nanotubes and the previously weak physical interactions between molecules with the tube surface would become stronger and, by binding chemically, allow the manipulation of the intrinsic properties of the nanotubes.The structural and electronic properties of end-CCN pristine and functionalized by carboxyl, amine, amide, and hydroxyl chemical groups under the action of electric fields are investigated through first-principles simulations based on the density functional theory.

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Section: Resultsmentioning

confidence: 99%

Pristine and functionalized capped carbon nanotubes under electric fields

Menezes

Mota

Zanella

et al. 2013

Physica Status Solidi (b)

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“…Most of these studies have reported emission currents ranging from 1 mA• cm −2 to 1 A• cm −2 . Conversely, single SWNT and MWNT emitters have been alternatively developed by attaching them on a metal tip using the electrophoresis method (see Figure 8(b)) [120,121]. An emission current higher than 100 μA has been achieved from a single MWNT emitter, with a current density of~10 7 A • cm −2 .…”

Section: A DC Field Emission In Cntsmentioning

confidence: 99%

Ultrashort field emission in metallic nanostructures and low-dimensional carbon materials

Park

Ahn

2020

Advances in Physics: X

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This study investigates recent advances in photoelectron emission generated by irradiating ultrashort lasers on metallic nanostructures and low-dimensional carbon materials. Recently, primary focus has been on improving the efficiency of emitters, i.e. increasing the number of field-emitted electrons and their respective kinetic energies. An example of this is the modification of the conventional metal nanotip through adiabatic nanofocusing and various plasmonic metal structures, such as nanorods and bowtie antenna. The coherent emission control with two color irradiation enabled modulation in the emission yield. In addition, THz waves near the metallic nanostructure induced a highly accelerated, monochromatic energy. Alternative to metallic nanotips, carbon nanotubes are emerging as efficient photoelectron emitters, due to the large enhancement factor associated with their high aspect ratio and damage threshold. They particularly allowed the use of femtosecond light sources with a relatively short wavelength, resulting in the generation of photoelectrons with a narrow bandwidth. Additionally, electronic control over the singlewalled nanotubes band structure added a degree of freedom for controlling the electron emission yield. Finally, we review the strong-field tunneling emission in graphene edge, with the emission yield showing an anomalous increase of nonlinear order, corresponding to the deep strong tunneling regime.

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“…For example, Kim et al studied the field emission of carbon-nanotube point electron source based on the conventional diode structure [15,16]. Lee et al studied the normal-gate electron source with carbon nanotubes, which can apply for field emission displays [17].…”

Section: Introductionmentioning

confidence: 99%