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.

Field Emission Properties of Individual Carbon Nanotubes in Nanorobotic Manipulation and Electron-Beam-Induced Deposition

2004 ◽  
Vol 16 (6) ◽  
pp. 597-603 ◽  
Author(s):  
Fumihito Arai ◽  
◽  
Pou Liu ◽  
Lixin Dong ◽  
Toshio Fukuda ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electron Beam ◽  
Field Emission ◽  
Emission Current ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Field Emission Current ◽  
Multi Walled Carbon Nanotubes ◽  
Electron Beam Induced Deposition ◽  
Afm Cantilever

Field emission properties of individual multi-walled carbon nanotubes (MWNTs) were studied in nanorobotic manipulation and electron-beam-induced deposition (EBID). Nanotube emitters are constructed by picking up and assembling individual nanotubes on a commercially available atomic force microscope (AFM) cantilever or a tungsten probe. The relationship between field emission current and interelectrode distance was obtained by changing the distance between the tip of the nanotube emitter and the counterpart anode, which can be potentially applied as the principle for an approaching sensor to detect nanometer scale distance by observing field emission current in real time. Field emission current on a microampere scale from a CNT emitter was shown to be strong enough for EBID without obviously degrading emitters. Deposit topology was related to current density or the emitter shape, suggesting that information on emitter geometry could be obtained from EBID deposits. Energy dispersive X-ray spectrometry (EDS) analysis of deposits from W(CO)6showed that the tungsten mass exceeds 80% on the average among compositions. Much higher voltage may degrade the emitter, and saturated current may be used to adjust the emitter length in a controlled way.

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.

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.

Influence of Cathode Size on Field Emission Properties of a Single Vertical Carbon Nanotube Material

2016 ◽  
Vol 723 ◽  
pp. 454-458 ◽  
Author(s):  
Li Guo Jing ◽  
He Qiu Zhang ◽  
Yu Qiu ◽  
Bing Yin ◽  
Li Zhong Hu
Keyword(s):  
Carbon Nanotube ◽  
Electric Field ◽  
Field Emission ◽  
Emission Current ◽  
Perfect Conductor ◽  
Current Increase ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Field Emission Current ◽  
Constant Potential

In this work, we study the field emission properties of a single vertical carbon nanotube with cathode radius changing. The carbon nanotube is considered as purely perfect conductor, and the anode and cathode are modeled as discs. The radius of anode is kept as 24m, then the radius of cathode is changed from 24 m to 1 m. The emitter of that CNT consists of a hemispherical cap of 4 nm radius (r) on top of a cylinder height of 2 m (h). The distance from anode to cathode is w=h+20m. The overall surface area of the CNT and cathode are all grounded, and the anode plate has a constant potential value of 100 V. The distribution of potential and electric field, field emission current are obtained by simulating with the help of COMSOL Multiphysics 4.3b electrostatics module. We find that with cathode radius decrease, the electric field strength over the surface of carbon nanotube (CNT) strengthening and field emission current increase.

Enhanced field-emission properties of buckled α-borophene by means of Li decoration: a first-principles investigation

2018 ◽  
Vol 20 (22) ◽  
pp. 15139-15148 ◽  
Author(s):  
Bing Zheng ◽  
Liang Qiao ◽  
Hai-tao Yu ◽  
Qi-yue Wang ◽  
Ying Xie ◽  
...  
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Field Emission ◽  
Potential Barrier ◽  
Electron Emission ◽  
First Principles ◽  
Emission Current ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Field Emission Current

Li decoration and external electric field decrease the potential barrier to electron emission and increase field emission current of buckled α-borophene.

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