Single-Wall Carbon Nanotubes Field Emission Properties: A Theoretical Study of the Effects of Cs

2003 ◽  
Vol 800 ◽  
Author(s):  
Brahim Akdim ◽  
Xiaofeng Duan ◽  
Donald A. Shiffler ◽  
Ruth Pachter
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Density Functional ◽  
Single Wall Carbon Nanotubes ◽  
Cathode Plasma ◽  
High Power Microwave ◽  
Single Wall Carbon ◽  
Emission Properties ◽  
Adsorption Mechanisms ◽  
Field Emission Properties

ABSTRACTCarbon nanotubes-based materials appeal for explosive emission, in forming cathode plasma, of interest for high-power microwave tubes. Cs intercalation has demonstrated a significant reduction of the work function of carbon nanotubes, thus improving field emission properties. An understanding of the detailed adsorption effects is important because the current saturation is attributed, in part, to adsorption mechanisms. In this paper, we report a density functional theory study of the effects of Cs on field emission of single-wall carbon nanotubes (SWCNTs), as an example of an approach to be taken for a fundamental understanding of such properties.

Field Emission Properties of the Single-Wall Carbon Nanotubes Synthesized by Arc-Discharge Method

2012 ◽  
Vol 535-537 ◽  
pp. 465-468
Author(s):  
Shu Xian Wu ◽  
Fu Yang ◽  
Shao Lin Xue ◽  
Xin Luo Zhao
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Arc Discharge ◽  
Emission Current Density ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Fe Catalyst ◽  
Dc Arc

The field emission properties of single-wall carbon nanotubes with purity higher than 70%,which were produced by dc arc discharge evaporation of a carbon electrode including 1% Fe catalyst in H2-Ar mixture gas was studied.The single-wall carbon nanotubes that were produced by this method possess high a ‘clean’ surface since the coexisting Fe catalyst nanoparticles can be completely eliminated by a two-step purification process.The field emission properties was verified by measuring the emission current density(J) versus the applied electric field(E), the corresponding Fowler-Nordheim(F-N) plot for the sample.Through looking at the emission photos, the uniformity of field emission is found to be excellent.

CORRELATION BETWEEN ELECTRONIC STRUCTURES OF METAL-INTERCALATED SINGLE WALL CARBON NANOTUBES WITH THEIR FIELD EMISSION PROPERTIES

2005 ◽  
Vol 04 (spec01) ◽  
pp. 657-668
Author(s):  
YAN WANG ◽  
THANH N. TRUONG
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Electronic Structures ◽  
Dft Method ◽  
Emission Current ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Field Emission Current

The effects of various metal intercalations ( Li , Na and Be ) on the electronic structures and the field emission properties of single-wall carbon nanotubes (SWNT) were investigated using the periodic plane-wave DFT method. We found that intercalations of metal tend to shift the conductive characteristics of the SWNT from those of a semiconductor to those of a quasi-metallic conductor. The Fermi levels for all metal-intercalated in SWNT are moved toward the conduction band, induced by the charge transfer from the metal to the SWNT. Intercalations of Li and Na atoms increase the field emission current, whereas Be intercalation does not affect the field emission current due to the absence of high density of states around the Fermi level. The correlation between the electronic structures for the metal-intercalated nanowires with field emission properties is further discussed in light of the above results.

Density Functional Theory Study of Influence of Hydrogen Absorption on the Field Emission Properties of Carbon Nanotubes

2011 ◽  
Vol 306-307 ◽  
pp. 1166-1169
Author(s):  
Kai Sun ◽  
Zhi Qin Fan ◽  
Xiu Ying Liu
Keyword(s):  
Carbon Nanotubes ◽  
Density Functional Theory ◽  
Field Emission ◽  
Density Functional ◽  
Local Density ◽  
Functional Theory ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Hydrogen Molecules ◽  
Adsorption Of Hydrogen

The field-emission properties of capped(5, 5) single-walled carbon nanotubes with hydrogen adsorbed on the tip with and without an applied electric field have been investigated using first-principles density-functional theory. It is found that the structure of carbon nanotubes with hydrogen molecules is stable under field-emission conditions. The local density of states at the Fermi level increases with the adsorption of hydrogen molecules. These results elucidate that the field-emission properties of carbon nanotubes can be enhanced by the adsorption of hydrogen molecules, and are consistent with the experimental results.

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