Field Emission Properies of CNTs Treated by Helium Plasma

2011 ◽  
Vol 347-353 ◽  
pp. 4008-4011
Author(s):  
Shao Lin Xue ◽  
Shu Xian Wu ◽  
Ran Huang ◽  
Zi Xin Jiang ◽  
Jian Fang Fang
Keyword(s):  
Field Emission ◽  
Emission Current Density ◽  
Treatment Method ◽  
Emission Characteristics ◽  
Helium Plasma ◽  
Turn On ◽  
Field Emission Current ◽  
Field Emission Current Density ◽  
Surface Morphologies ◽  
Screen Printed

This paper presented a novel post-treatment method of He plasma,which could effectively improve the field emission characteristics of screen-printed CNTs cathodes. Notable changes in the surface morphologies of screen-printed CNTs cathodes were investigated by scanning electron micro scope (SEM) as the f unction of treatment by He plasma.The results showed the post-treated CNTs cathodes hold lower turn-on electric field,higher field emission current density,more emission sites,and better uniformity than those of untreated ones.

Low turn-on field and high field emission current density from Ag/TiO2 nanocomposite

2016 ◽  
Vol 657 ◽  
pp. 167-171 ◽  
Author(s):  
Girish P. Patil ◽  
Amol B. Deore ◽  
Vivekanand S. Bagal ◽  
Dattatray J. Late ◽  
Mahendra A. More ◽  
...  
Keyword(s):  
Field Emission ◽  
Current Density ◽  
High Field ◽  
Emission Current Density ◽  
Emission Current ◽  
Turn On ◽  
Field Emission Current ◽  
Field Emission Current Density

Field emission of electrons from spherical conducting carbon nanotube tip including the effect of image force

2011 ◽  
Vol 89 (8) ◽  
pp. 875-881
Author(s):  
Suresh C. Sharma ◽  
Aarti Tewari
Keyword(s):  
Potential Energy ◽  
Density Function ◽  
Field Emission ◽  
Current Density ◽  
Radial Distance ◽  
Image Force ◽  
Emission Current Density ◽  
Transmission Probability ◽  
Field Emission Current ◽  
Field Emission Current Density

An expression for the potential energy and field emission current density function of spherical conducting carbon nanotubes (CNTs), including the effect of image force, corresponding to the expression for the electron transmission coefficient obtained from the solution of the time-independent Schrödinger equation, has been derived. Numerical calculations of the potential energy, transmission coefficient, and the current density function have been carried out for the typical set of CNT parameters. It is found that the potential energy decreases with radial distance when image force is ignored. When image force is incorporated, it increases with radial distance in the beginning and then decreases. The transmission probability and the current density function increase, both with the normalized radial energy and normalized Fermi energy, but both the transmission probability and the current density function are larger in the presence of the image force for given values of the normalized radial energy and the normalized Fermi energy. In addition, the image force decreases the applied value of the field. The field emission current density function of emitted electrons decreases with the spherical CNT tip radius. Some of our theoretical results are in accordance with existing experimental observations.

Effect of Catalyst Thickness and Plasma Pretreatment on the Growth of Carbon Nanotubes and Their Field Emission Properties

2007 ◽  
Vol 7 (11) ◽  
pp. 3731-3735 ◽  
Author(s):  
Hyung Soo Uh ◽  
Sang Sik Park ◽  
Byung Whan Kim
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Field Enhancement ◽  
Close Relation ◽  
Emission Current Density ◽  
Ni Catalyst ◽  
Emission Characteristics ◽  
Field Emission Properties ◽  
Turn On ◽  
Plasma Pretreatment

We demonstrated that the diameter and the density of carbon nanotubes (CNTs) which had a close relation to electric-field-screening effect could be easily changed by the control of catalytic Ni thickness combined with NH3 plasma pretreatment. Since the diameter and the density of CNTs had a tremendous impact on the field-emission characteristics, optimized thickness of catalyst and application of plasma pretreatment greatly improved the emission efficiency of CNTs. In the field emission test using diode-type configuration, well-dispersed thinner CNTs exhibited lower turn-on voltage and higher field enhancement factor than the densely-packed CNTs. A CNT film grown using a plasma-pretreated 25 Å-thick Ni catalyst showed excellent field emission characteristics with a very low turn-on field of 1.1 V/μm @ 10 μA/cm2 and a high emission current density of 1.9 mA/cm2 @ 4.0 V/μm, respectively.

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