Corrected field enhancement factor for the floating sphere model of carbon nanotube emitter

2010 ◽  
Vol 108 (4) ◽  
pp. 044502 ◽  
Author(s):  
Evgeny G. Pogorelov ◽  
Yia-Chung Chang ◽  
Alexander I. Zhbanov ◽  
Yong-Gu Lee
Keyword(s):  
Carbon Nanotube ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Field Enhancement Factor ◽  
Sphere Model

Screened field enhancement factor for the floating sphere model of a carbon nanotube array

2011 ◽  
Vol 110 (11) ◽  
pp. 114311 ◽  
Author(s):  
A. I. Zhbanov ◽  
E. G. Pogorelov ◽  
Yia-Chung Chang ◽  
Yong-Gu Lee
Keyword(s):  
Carbon Nanotube ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Field Enhancement Factor ◽  
Sphere Model ◽  
Nanotube Array ◽  
Carbon Nanotube Array

scholarly journals Calculation of field enhancement factor of the carbon nanotube array

2006 ◽  
Vol 55 (2) ◽  
pp. 797
Author(s):  
Wang Miao ◽  
Shang Xue-Fu ◽  
Li Zhen-Hua ◽  
Wang Xin-Qing ◽  
Xu Ya-Bo
Keyword(s):  
Carbon Nanotube ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Field Enhancement Factor ◽  
Nanotube Array ◽  
Carbon Nanotube Array

Modeling Calculation for Field Enhancement Factor on A Carbon Nanotube Array with Parallel Back-grid

2014 ◽  
Vol 35 (2) ◽  
pp. 224-231
Author(s):  
雷达 LEI Da ◽  
孟根其其格 MENGGEN Qi-qi-ge ◽  
梁静秋 LIANG Jing-qiu ◽  
王维彪 WANG Wei-biao
Keyword(s):  
Carbon Nanotube ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Field Enhancement Factor ◽  
Nanotube Array ◽  
Carbon Nanotube Array ◽  
Modeling Calculation

Field-enhancement factor for carbon nanotube array

2005 ◽  
Vol 98 (1) ◽  
pp. 014315 ◽  
Author(s):  
M. Wang ◽  
Z. H. Li ◽  
X. F. Shang ◽  
X. Q. Wang ◽  
Y. B. Xu
Keyword(s):  
Carbon Nanotube ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Field Enhancement Factor ◽  
Nanotube Array ◽  
Carbon Nanotube Array

Near-Field Calibration of Isolated Carbon Nanotube Field Emitters for Nanomanufacturing Applications

2004 ◽  
Author(s):  
King-Fu Hii ◽  
R. Ryan Vallance ◽  
Padmakar D. Kichambare ◽  
M. Pinar Mengu¨c¸
Keyword(s):  
Carbon Nanotube ◽  
Enhancement Factor ◽  
Near Field ◽  
Field Enhancement ◽  
Field Enhancement Factor ◽  
Strong Function ◽  
Field Calibration ◽  
Turn On ◽  
Field Emitters ◽  
Precise Knowledge

This paper reports the development of an apparatus, technique, and method for calibrating the field emission phenomena’s dependence on both the voltage applied between the anode and cathode and the electrodes gap. A precise knowledge of the electrodes gap is required for calibrating field emitters. The I-V characteristic of isolated carbon nanotube field emitter is a strong function of the electrodes gap distance. A consolidated IV curve is obtained by calculating the current density and the local electric field with the field enhancement factor taken into consideration. The field enhancement factor and emitting area are unique for each electrodes gap distance. We also found that the turn-on voltage decreases as the electrodes gap distance decreases.

Field-Enhancement Factor of a Carbon Nanotube Cold Cathode Triode

2014 ◽  
Vol 552 ◽  
pp. 257-262
Author(s):  
Da Lei ◽  
Qi Qi Ge Menggen
Keyword(s):  
Carbon Nanotube ◽  
Aspect Ratio ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Model System ◽  
Field Enhancement Factor ◽  
Geometrical Parameters ◽  
Hole Size ◽  
Cold Cathode ◽  
Image Charge

To estimate the field-enhancement factor, the model system of floated sphere in triode configuration of the carbon nanotube was proposed, and the actual electric field and field-enhancement factor at the apex of carbon nanotube were calculated with the image charge method analytically. The field-enhancement factor given as β=3+ρ+W, where ρ is the aspect ratio of the carbon nanotube, and W is the function of geometrical parameters and the anode and gate voltages. The geometrical parameters affects the field-enhancement factor very much, such as the field-enhancement factor decreased rapidly with the increasing of top radius of carbon nanotube, gate-cathode distance and gate-hole size. The field-enhancement factor could be improved via concocting the gate-electrode.

Thin Multiwall Carbon Nanotube Field Emitters with Microchannel Plate for High Current Emission

2005 ◽  
Vol 891 ◽  
Author(s):  
Raghunandan Seelaboyina ◽  
Jun Huang ◽  
Won Bong Choi
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Enhancement Factor ◽  
Multiwall Carbon Nanotubes ◽  
Field Enhancement ◽  
Microchannel Plate ◽  
Field Enhancement Factor ◽  
Thin Wall ◽  
Electron Multiplier ◽  
Multiwall Carbon

ABSTRACTWe report a method to amplify the electron current of carbon nanotube field emitter cathode using an electron multiplier and synthesis of thin multiwall carbon nanotubes by thermal chemical vapor deposition. A commercial microchannel plate which is an array of microscopic electron multipliers was used for this purpose. A microchannel plate placed between the cathode and anode amplified the current and also acted as protection shield for nanotubes during vacuum arcing. The turn-on field was approximately 1 V/µm for both cases, but current obtained was 3 times higher and the field was also lower. The increase in current is attributed to the electron multiplication, and to the increase in field enhancement factor from 9296 to 12815 (37%) with microchannel plate. The thin multiwall carbon nanotubes were synthesized using Mo/Fe catalyst solution. The inner and outer wall diameters of the nanotubes were in the range of 2.5-5 nm and 7-15 nm respectively, determined by Raman spectroscopy and transmission electron microscopy. The nanotubes had excellent field emission property which is attributed to their thin wall diameters ∼10 nm, high aspect ratio of 1500 and the high field enhancement factor of 9296. The emission current was stable with an average fluctuation of 2%.

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