Direct current surface plasma source with high emission current density

In this paper, field emission from ZnO was studied by morphological and electronic design. By fabricating ZnO into nanopin structure with sharp tip, we can obtain low threshold and high emission current density. By doping ZnO with gallium, we can lift up the Fermi level and increase the conductivity to enhance the field emission. The fabrication of nanostructures and analysis of field emission will be discussed.

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Electrochemical Synthesis of Conducting Polypyrrole Film on Tin Substrate: Structural, Chemical and Field Emission Investigations

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.36.44 ◽

2015 ◽

Vol 36 ◽

pp. 44-50 ◽

Cited By ~ 1

Author(s):

Pankaj M. Koinkar ◽

Sandip S. Patil ◽

Toshihiro Moriga ◽

Mahendra A. More

Keyword(s):

Field Emission ◽

Current Density ◽

Electrochemical Synthesis ◽

Applied Field ◽

Emission Current Density ◽

Emission Current ◽

Threshold Field ◽

Potential Candidate ◽

High Emission ◽

Very High

Electrochemical synthesis of Polypyrrole (PPy) thin films on Sn substrates has been carried out under cyclic voltammetry (CV) mode. The structural, morphological and chemical properties of the as-synthesized PPy films were investigated using various characterization techniques like SEM, UV-Visible and FTIR. Furthermore, field emission (FE) behaviour of the PPy thin film emitter were carried out at base pressure of ~ 1×10-8 mbar and found to be interesting. The threshold field, required to draw emission current density of 1 μA/cm2, is observed to be 0.90 V/μm and very high emission current density of 12.87 mA/cm2 has been drawn at applied field of ~ 2.8 V/μm. The emission current stability investigated at preset values of 1, 10 and 100 μA/cm2 is observed to be fairly good over duration of more than three hours. The simplicity of the synthesis route coupled with the capability to deliver very high emission current density at relatively lower applied field make the PPy thin field emitter as a potential candidate for practical applications in field emission based devices

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Ion source with high emission current density beam production

25th Anniversary, IEEE Conference Record - Abstracts. 1998 IEEE International Conference on Plasma Science (Cat. No.98CH36221) ◽

10.1109/plasma.1998.677801 ◽

2002 ◽

Author(s):

V. Dudnikov ◽

J.P. Farrell

Keyword(s):

Current Density ◽

Emission Current Density ◽

Ion Source ◽

Emission Current ◽

Beam Production ◽

High Emission

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Polypyrrole nanostructures and their field emission investigations

Modern Physics Letters B ◽

10.1142/s0217984915400357 ◽

2015 ◽

Vol 29 (06n07) ◽

pp. 1540035 ◽

Cited By ~ 2

Author(s):

Kashmira Harpale ◽

Mahendra A. More ◽

Pankaj M. Koinkar ◽

Sandip S. Patil ◽

Kishor M. Sonawane

Keyword(s):

Field Emission ◽

Current Density ◽

Monomer Concentration ◽

Emission Current Density ◽

Emission Current ◽

Electrically Conducting ◽

Turn On ◽

High Emission ◽

Granular Morphology ◽

Very High

Polypyrrole (PPy) nanostructures have been synthesized on indium doped tin oxide (ITO) substrates by a facile electrochemical route employing cyclic voltammetry (CV) mode. The morphology of the PPy thin films was observed to be influenced by the monomer concentration. Furthermore, FTIR revealed formation of electrically conducting state of PPy. Field emission investigations of the PPy nanostructures were carried out at base pressure of 1×10-8 mbar . The values of turn-on field, corresponding to emission current density of 1 μA/cm2 were observed to be 0.6, 1.0 and 1.2 V/μm for the PPy films characterized with rod-like, cauliflower and granular morphology, respectively. In case of PPy nanorods maximum current density of 1.2 mA/cm2 has been drawn at electric field of 1 V/μm. The low turn on field, extraction of very high emission current density at relatively lower applied field and good emission stability propose the PPy nanorods as a promising material for field emission based devices.

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High emission current density electron gun for a 263 GHz sheet beam traveling wave tube

2017 Eighteenth International Vacuum Electronics Conference (IVEC) ◽

10.1109/ivec.2017.8289561 ◽

2017 ◽

Cited By ~ 2

Author(s):

Yuan Zheng ◽

Diana Gamzina ◽

N. C. Luhmann ◽

Mariano Moran

Keyword(s):

Current Density ◽

Traveling Wave ◽

Emission Current Density ◽

Electron Gun ◽

Emission Current ◽

Traveling Wave Tube ◽

Wave Tube ◽

High Emission

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Field Emission Properties of Large Area Carbon Nanotube Cathodes in DC and Pulse Modes

MRS Proceedings ◽

10.1557/proc-1081-p15-07 ◽

2008 ◽

Vol 1081 ◽

Author(s):

Qingliang Liao ◽

Yue Zhang ◽

Liansheng Xia ◽

Junjie Qi ◽

Yunhua Huang ◽

...

Keyword(s):

Carbon Nanotube ◽

Electric Field ◽

Field Emission ◽

Direct Current ◽

Current Density ◽

Emission Current Density ◽

Pulse Mode ◽

Emission Current ◽

Large Area ◽

Emission Properties

AbstractA large area carbon nanotube cathode was fabricated by use of a screen printing method. The emission properties of the cathode were investigated in both direct current and pulse mode experiments. In the direct current mode, the cathode has high field enhancement factor and high emission current density. In the double-pulse mode, the emission current density can approach 267 A/cm2 at an applied electric field of 15.4 V/um. Steady intense electron beams were obtained from the cathode. The results proved that the emission mechanism of CNTs at pulse electric field is plasma-induced field emission. The carbon nanotube cathode is suitable for not only field emission display applications but also high-power microwave device applications.

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