scholarly journals Electron emission properties of Spindt-type platinum field emission cathodes

2004 ◽  
Vol 95 (3) ◽  
pp. 1537-1549 ◽  
Author(s):  
Y. Gotoh ◽  
M. Nagao ◽  
D. Nozaki ◽  
K. Utsumi ◽  
K. Inoue ◽  
...  
Keyword(s):  
Field Emission ◽  
Electron Emission ◽  
Emission Properties ◽  
Field Emission Cathodes

Optical and Electron Emission Properties of h-BN Films Codoped with Mg and O Atoms

2013 ◽  
Vol 566 ◽  
pp. 175-178
Author(s):  
Shinji Ohtani ◽  
Kenkichiro Kobayashi
Keyword(s):  
Electric Field ◽  
Field Emission ◽  
Electron Emission ◽  
Electron Field Emission ◽  
Emission Properties ◽  
Electron Field ◽  
Quartz Substrates ◽  
Lower Electric Field

Films of hexagonal BN (h-BN) codoped with Mg and O atoms were grown on n-type Si and quartz substrates heated at 500 °C by sputtering targets consisting of h-BN and MgO powders. An absorption is seen at a wavelength < 400 nm for h-BN films prepared in an Ar atmosphere. In contrast, films prepared from the target containing 0.25 mol% MgO in an atmosphere of Ar + 1% O2 shows an absorption at a wavelength < 260 nm and an electron field emission at a lower electric field of 3.6 V/μm.

Emission properties of explosive field emission cathodes

2011 ◽  
Vol 18 (10) ◽  
pp. 103108 ◽  
Author(s):  
Amitava Roy ◽  
Ankur Patel ◽  
Rakhee Menon ◽  
Archana Sharma ◽  
D. P. Chakravarthy ◽  
...  
Keyword(s):  
Field Emission ◽  
Emission Properties ◽  
Field Emission Cathodes

scholarly journals Field Emission Properties of the Graphene Double-Walled Carbon Nanotube Hybrid Films Prepared by Vacuum Filtration and Screen Printing

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Jinzhuo Xu ◽  
Tao Feng ◽  
Yiwei Chen ◽  
Zhuo Sun
Keyword(s):  
Carbon Nanotube ◽  
Field Emission ◽  
Electron Emission ◽  
Screen Printing ◽  
Weight Ratio ◽  
Hybrid Films ◽  
Vacuum Filtration ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Turn On

The graphene double-walled carbon nanotube (DWCNT) hybrid films were prepared by vacuum filtration and screen printing. Their electron field emission properties have been studied systematically. The electron emission properties of the hybrid films are much better than those of pure DWCNT films and pure graphene films. Comparing with the screen printed films, the vacuum filtered films have many advantages, such as lower turn-on field, higher emission current density, better uniformity, better long-term stability, and stronger adhesive strength with conductive substrates. The optimized hybrid films with 20% weight ratio of graphene, which were fabricated by vacuum filtration, show the best electron emission performances with a low turn-on field of 0.50 Vμm−1(at 1 μAcm−2) and a high field enhancement factorβof 27000.

Structure and emission properties of structures based on carbon walls and aluminum nitride

2021 ◽  
Author(s):  
S.A. Bagdasaryan ◽  
S.A. Nalimov
Keyword(s):  
Field Emission ◽  
Hexagonal Lattice ◽  
Opal Matrix ◽  
Emission Properties ◽  
Graphene Layers ◽  
Composition And Structure ◽  
Current Voltage ◽  
Aln Film ◽  
Current Voltage Characteristics ◽  
Field Emission Cathodes

To create field emission cathodes (autocathodes) used in the manufacture of displays and other devices, carbon nanowalls (CNW) are promising. The CNW layers are a porous material consisting of curved plates formed by graphene layers. The industrial use of CNW autocathodes is impeded by the heterogeneity and instability of the magnitude and density of the cathode current. To improve the characteristics of autocathodes, an AlN film is formed on the surface of the emitting substance, which also has the property of field emission. CNW was obtained from a gas mixture of H2 and CH4 activated by a dc glow discharge. The CNW layers were deposited on silicon substrates and substrates representing a layered structure made by forming an opal matrix (OM) layer on a Si substrate. AlN films with controlled composition and structure were prepared by RF magnetron reactive sputtering. CNW layers with a thickness of > 4 μm were obtained by successive growth of two CNW layers (Si/CNW/CNW structure). An additional CNW layer was also grown on the surface of the first layer coated with Ni (Si/CNW/Ni/CNW structure). AlN films were grown on a CNW layer (Si/CNW/AlN and Si/OM/Ni/CNW/AlN structures). It is shown that CNW plates are formed from graphene layers partially connected by atomic bonds (up to 30 layers) packed in a hexagonal lattice, and AlN films consisted of amorphous and axially textured crystalline phases. The current-voltage characteristics of the autocathodes were measured in a pulsed mode at a pressure of ~10−3 Pa. The Si/CNW/CNW structures are characterized by a threshold of autoemission of ≤ 3.6 V/μm and a high density of centers of emission. The current-voltage characteristics of the layered structures Si/CNW/AlN, Si/OM/Ni/CNW and Si/OM/Ni/CNW /AlN showed better emission properties compared to the Si/CNW structure. The current-voltage characteristics considered make it possible to predict the structure and composition of the emitting layer to improve the operational characteristics of multilayer autocathodes.

ANNEALING TEMPERATURE EFFECT ON THE FIELD EMISSION PROPERTIES OF CARBON NANOTUBE FILMS

2007 ◽  
Vol 14 (05) ◽  
pp. 969-972
Author(s):  
T. CHEN ◽  
Z. SUN ◽  
L. L. WANG ◽  
Y. W. CHEN ◽  
P. S. GUO ◽  
...  
Keyword(s):  
Temperature Effect ◽  
Field Emission ◽  
Annealing Temperature ◽  
Chemical Vapor ◽  
Carbon Phase ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Field Emission Cathodes ◽  
Film Annealing ◽  
Field Emission Performance

As the carbon nanotubes (CNTs) films are applied to the field emission cathodes in the vacuum devices, heat treatment in the range of 400°C–500°C is often conducted during the device sealing process, especially for glass-based devices. The annealing temperature effect on the field emission of the CNT films prepared by chemical vapor deposition is investigated. The CNT film annealed at 400°C in air contains less amorphous carbon phase, and shows better field emission properties comparing to the as-grown CNT film. Annealing at 450°C causes serious oxidative damage along the tube walls, resulting in the poor field emission performance. The CNTs annealed at 500°C are all burned out. The experiment shows that the sealing temperature at 400°C or below can be conducted in air, while the sealing temperature above 400°C should be done in N 2 or Ar ambient.

Emission Properties of Nanostructured Carbon Field-Emission Cathodes

2001 ◽  
Vol 685 ◽  
Author(s):  
A.G Chakhovskoi ◽  
N.N Chubun ◽  
C.E. Hunt ◽  
A.N Obraztsov ◽  
A.P. Volkov
Keyword(s):  
Field Emission ◽  
Low Voltage ◽  
Flat Panel Display ◽  
Nanostructured Carbon ◽  
Applied Current ◽  
Flat Panel ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Field Emission Cathodes ◽  
Emission Cathode

AbstractPlanar field-emission cathode structures consisting of nanostructured carbon flakes have been investigated as an electron source for flat panel display application.Layers of nanoflakes were grown on silicon and molybdenum substrates using a high- temperature pyrolitic plasma-assisted CVD method. The result is a vertically oriented nanocluster layer of 1-2 micrometer height chemically bonded with the substrates. Additional orientation of the flakes, occurring during the first activation of the cathodes, was observed.Field emission properties of the emitters were studied in a vacuum chamber and in sealed flat-panel prototype devices with non-patterned low-voltage phosphor screens. Emitters with an area up to 1 square inch were tested under DC currents up to 100 microamps in diode mode. Anode bias up to 1.5 kV was applied. Current fluctuations of 1-2% were achieved using loading resistor.

Enhancement of field electron emission in topological insulator Bi2Se3 by Ni doping

2018 ◽  
Vol 20 (27) ◽  
pp. 18429-18435 ◽  
Author(s):  
Kushal Mazumder ◽  
Alfa Sharma ◽  
Yogendra Kumar ◽  
Prashant Bankar ◽  
Mahendra A. More ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Field Emission ◽  
Topological Insulator ◽  
Electron Emission ◽  
Field Electron Emission ◽  
Bismuth Selenide ◽  
Ni Doping ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Field Electron

Nanostructures of bismuth selenide (Bi2Se3), a 3D topological insulator material, and nickel (Ni) doped Bi2Se3 samples were prepared by a hydrothermal method to explore the field emission properties.

Enhancement of Electron Emission Properties of Carbon Nanotubes by the Decoration with Low Work Function Metal Oxide Nanoparticles

2020 ◽  
Vol 20 (10) ◽  
pp. 6463-6468 ◽  
Author(s):  
Mohammad M. H. Raza ◽  
Sunny Khan ◽  
Mohd Sadiq ◽  
Mohammad Zulfequar ◽  
Mushahid Husain ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Work Function ◽  
Field Emission ◽  
Electron Emission ◽  
Enhancement Factor ◽  
Metal Oxide Nanoparticles ◽  
Field Enhancement ◽  
Field Enhancement Factor ◽  
Oxide Nanoparticles ◽  
Emission Properties

In the present report, the properties of the field emission devices of carbon nanotubes (CNTs) were remarkably improved by decorating their surface with magnesium oxide nanoparticles (MgO NPs). The MgO NPs were attached effectively on the surface of CNTs via thermal evaporation. The Raman spectra confirm the graphitic order of as-grown pristine CNTs with RBM (radial breathing mode), D band and G band peaks at the 282 cm−1, 1347 cm−1 and 1594 cm−1 respectively. The peak at 471 cm−1 indicates successful attachment of MgO NPs to the CNTs. The enhanced field emission properties of CNTs were mainly attributed to the MgO NPs which increased the field enhancement factor and the density of emission sites. The decreased work function and increased field enhancement factor were responsible for the improved FE properties of the CNTs. Our results indicate that the MgO decorated CNTs can be used as an effective field emitter for various electron emission devices. The turn-on field decrease from 1.6 V/μm to 1.3 V/μm and the maximum current density increases from 1.581 to 3.678 mA/cm2 after the decoration of CNTs with MgO NPs. The value of field enhancement factor (β) also increases from 2.814×103 to 9.823×103.

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