Fabrication of Field Emitter Arrays of Carbon Nanotubes Aligned on Patterned Substrates using Self-Assembly Monolayer

2003 ◽  
Vol 772 ◽  
Author(s):  
Ok-Joo Lee ◽  
Soo-Hwan Jeong ◽  
Kun-Hong Lee
Keyword(s):  
Carbon Nanotubes ◽  
Polymer Film ◽  
Silicon Wafer ◽  
Field Emission ◽  
Self Assembly ◽  
Room Temperature ◽  
Emission Current Density ◽  
Patterned Substrates ◽  
Field Emitter Arrays ◽  
Current Densities

AbstractField emissions from the singlewalled carbon nanotubes (SWNTs) attached on various patterned substrates such as silicon wafer and polymer film, are reported. SWNTs were cut into sub-micron length by sonication in an acidic solution. The SWNT emitters were aligned on Au surface at room temperature by self-assembly monolayer technique. The field emission measurements in a silicon wafer and a polymer film showed that the turn-on fields were 2.8 V/ νm and 3.9 V/ νm at the emission current density of 10 μA/cm2, respectively. The current densities were 0.9 mA/cm2 and 1.6 mA/cm2 at 6.0 V/ νm. This room temperature process is suitable for the fabrication of flexible field emission devices with carbon nanotubes.

Room-temperature fabrication of high-resolution carbon nanotube field-emission cathodes by self-assembly

2003 ◽  
Vol 82 (15) ◽  
pp. 2521-2523 ◽  
Author(s):  
S. J. Oh ◽  
Y. Cheng ◽  
J. Zhang ◽  
H. Shimoda ◽  
O. Zhou
Keyword(s):  
Carbon Nanotube ◽  
High Resolution ◽  
Field Emission ◽  
Self Assembly ◽  
Room Temperature ◽  
Field Emission Cathodes

Preparation and Field Emission Properties of Ag-CNTs by Electroless Plating

2010 ◽  
Vol 148-149 ◽  
pp. 983-986 ◽  
Author(s):  
Yu Xiang You ◽  
Yun Ye ◽  
Yi Jing Su ◽  
Qiao Zhi Tang ◽  
Tai Liang Guo
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Electroless Plating ◽  
Emission Current Density ◽  
Small Radius ◽  
Radius Of Curvature ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Pristine Cnts ◽  
Electrophoresis Deposition

Carbon nanotubes (CNTs) demonstrate attractive characteristics as cold cathode emitters for high aspect ratio, small radius of curvature, high mechanical strength and chemical stability. In this article, Ag-CNTs were prepared by a series of processes including acid-treating, sensitizing, activating and electroless plating. Then Ag-CNTs cathode were sucessfully fabricated by electrophoresis deposition (EPD) method. The morphologies of Ag-CNTs cathode and pristine CNTs cathode were observed by scanning electron microscopy (SEM). The results showed that the field emission properties of Ag-CNTs cathode were better than pristine CNTs cathode, for presenting lower turn-on field, larger emission current density, more stabilization and longer lifetime. Thus it can be seen that the Ag-CNTs cathode can improve the characteristics of carbon nanotubes field emission display (CNT-FED).

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.

Large field emission current density from well-aligned carbon nanotube field emitter arrays

2001 ◽  
Vol 1 (1) ◽  
pp. 61-65 ◽  
Author(s):  
Jung Inn Sohn ◽  
Seonghoon Lee ◽  
Yoon-Ho Song ◽  
Sung-Yool Choi ◽  
Kyoung-Ik Cho ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Field Emission ◽  
Current Density ◽  
Emission Current Density ◽  
Emission Current ◽  
Large Field ◽  
Field Emitter ◽  
Field Emitter Arrays ◽  
Field Emission Current ◽  
Field Emission Current Density

Electron Transport and Anode Heating Due to Field Emission From Carbon Nanotubes

2002 ◽  
Author(s):  
D. G. Walker ◽  
T. S. Fisher
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Anode Surface ◽  
Electron Trajectory ◽  
Coulomb Interactions ◽  
Turn On ◽  
Large Current ◽  
Ring Diameter ◽  
Current Densities ◽  
Vacuum Gap

Carbon nanotubes (CNT) are being considered for field emission applications because of their low turn-on voltage and ability to support large current densities. The localization of emission and large currents from CNTs result in significant anode heating. The present work investigates the electron energy distribution at the anode surface through simulation of the field emission process and the trajectory of electrons across the vacuum gap. Field emission is modeled by Fowler-Nordheim-like expressions where the emission site is assumed to be a ring with the diameter of a nanotube. The electron trajectory is determined through a Monte Carlo simulation including Coulomb interactions between electrons. Results indicate that the electron beam spreads due to Coulomb interaction, but that the initial ring is preserved. In fact, the ring diameter at the anode spreads to 3μ per 10μ of vacuum gap in a field of 10 Vμm. This estimate matches well with reported observations. Further, the spreading becomes more significant with increased fields due to the higher current density of field emitted electrons.

ENHANCEMENT OF FIELD EMISSION CHARACTERISTICS IN ALIGNED MULTIWALLED CARBON NANOTUBES DUE TO 70 MeV Ni6+ ION IRRADIATION

2011 ◽  
Vol 10 (04n05) ◽  
pp. 1057-1060
Author(s):  
BRAHMANANDA CHAKRABORTY ◽  
B. SATPATI ◽  
P. MODAK ◽  
K. S. HAZRA ◽  
P. RAI ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Field Emission ◽  
Low Dose ◽  
Ion Irradiation ◽  
Morphological Changes ◽  
Emission Current Density ◽  
Emission Characteristics ◽  
Electron Microscopic ◽  
Multiwalled Carbon

Here we report the role of ion irradiation in the field emission characteristics of aligned multiwalled carbon nanotubes (MWNTs). Aligned MWNTs show improvement in field emission characteristics under low dose 70 Mev Ni6+ ion irradiation. But field emission current density reduces for the higher dose due to adsorption of amorphous carbon and melting as well damage of carbon nanotubes (CNTs). High resolution transmission electron microscopic (HRTEM) analysis has been carried out to find the morphological changes due to ion irradiation leading to modifications in field emission characteristics. At low dose formation of dangling bond, cross-linking between different layers, exposure of buried emission sites and reduction of mutual shielding are responsible for the enhancement in field emission characteristics.

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