Ultrafast Field‐Emission Electron Sources Based on Nanomaterials

Zhou, Shenghan; Chen, Ke; Cole, Matthew T.; Li, Zhenjun; Chen, Jun; Li, Chi; Dai, Qing

doi:10.1002/adma.201805845

Cited by 54 publications

(47 citation statements)

References 156 publications

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“…To obtain the relationship between the electron emission and the input laser power, which is mainly laser-induced when below the turn-on voltage, the following uses the Fowler−DuBridge model [46] in which the traces are fit with a polynomial:…”

Section: Resultsmentioning

confidence: 99%

“…To obtain the relationship between the electron emission and the input laser power, which is mainly laser-induced when below the turn-on voltage, the following uses the Fowler−DuBridge model [ 46 ] in which the traces are fit with a polynomial:

where n is the order of the photon process, P is the average laser power, and C n is a fitting parameter. Figure 3 d shows, at a bias voltage of 300 V, the electron photoemission currents as a function of the laser intensities.…”

Section: Resultsmentioning

confidence: 99%

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Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays

Wang

et al. 2021

Nanomaterials

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Due to the high field enhancement factor and photon-absorption efficiency, carbon nanotubes (CNTs) have been widely used in optically induced field-emission as a cathode. Here, we report vertical carbon nanotube arrays (VCNTAs) that performed as high-density electron sources. A combination of high applied electric field and laser illumination made it possible to modulate the emission with laser pulses. When the bias electric field and laser power density increased, the emission process is sensitive to a power law of the laser intensity, which supports the emission mechanism of optically induced field emission followed by over-the-barrier emission. Furthermore, we determine a polarization dependence that exhibits a cosine behavior, which verifies the high possibility of optically induced field emission.

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Section: Resultsmentioning

confidence: 99%

“…To obtain the relationship between the electron emission and the input laser power, which is mainly laser-induced when below the turn-on voltage, the following uses the Fowler−DuBridge model [ 46 ] in which the traces are fit with a polynomial:

Section: Resultsmentioning

confidence: 99%

Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays

Wang

et al. 2021

Nanomaterials

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“…The photoemission through various multiphoton orders has been observed in the presence of a large DC field. It is important to note that this revealed a mechanism for photoexcited electron tunneling mediated by single-or multiphoton absorption, which is unique in the presence of the DC field [112].…”

Section: Electron Emission In the Presence Of A Strong DC Fieldmentioning

confidence: 95%

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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“…Graphene is able to resist against overheating without melting of metal or silicon substrate. Moreover, graphene is not able to conduct heat and, therefore, heat is concentrated at the center of carbon strings leading to intense light emission [128][129] [130].…”

Section: Graphene-based Bulbs and Light Emitting Diodes (Leds)mentioning

confidence: 99%

Graphene-reinforced polymeric nanocomposites in computer and electronics industries

2020

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Graphene is the newest member of the multidimensional graphite carbon family. Graphene is a two-dimensional atomic crystal formed by the arrangement of carbon atoms in the hexagonal network. It is the most rigid and thinnest material ever discovered and has a wide range of uses regarding its unique characteristics. It is expected that this material will create a revolution in the electronics industry. Graphene is a very powerful superconductor as the movability of charged particles is high on it, and additionally, because of the high surface energy and ? electrons being free, graphene can be used in manufacturing many electronics devices. In this paper, the applications of graphene nanoparticles reinforced polymer nanocomposites in the computer and electronics industry are investigated. These nanoparticles have received much attention from researchers and craftsmen, because graphene has unique thermal, electrical and mechanical properties. Its use as a filler in very small quantities substantially enhances the properties of nanocomposites. There are various methods for producing graphene-reinforced polymer nanocomposites. These methods affect the amount of graphene dispersion within the polymer substrate and the final properties of the composite. The application and the properties of graphene-reinforced polymer nanocomposites are discussed along with examples of results published in the papers. To better understand such materials, the applications of these nanocomposites have been investigated in a variety of fields, including batteries, capacitors, sensors, solar cells, etc., and the barriers to the growth and development of these materials application as suggested by the researchers are discussed. As the use of these nanocomposites is developing and many researchers are interested in working on it, the need to study and deal with these substances is increasingly felt.

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Ultrafast Field‐Emission Electron Sources Based on Nanomaterials

Cited by 54 publications

References 156 publications

Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays

Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays

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

Graphene-reinforced polymeric nanocomposites in computer and electronics industries

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