Study of Field Emission Behavior of Carbon Nanotubes with Different Sources

2002 ◽  
Vol 728 ◽  
Author(s):  
Mark Ching-Cheng Lin ◽  
M.S. Lai ◽  
H. J. Lai ◽  
M. H. Yang ◽  
B.Y. Wei ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Field Emission ◽  
Arc Discharge ◽  
Metal Catalyst ◽  
Microstructural Investigation ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Different Sources

AbstractThe field emission properties of carbon nanotubes (CNTs) from various sources are investigated for the application of field emission displays. Comparisons are made between graphite with Ni metal as catalyst and polycyclic aromatic hydrocarbon as precursor by the arc discharge method. Cathode deposits are examined using scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) to determine microstructure. Carbon structure is studied using Raman spectroscopy. Electron field emission characteristics are measured with the diode method at 10-6 torr pressure. In this study, SEM micrographs of cathode deposits show dense random fiber-like carbon nanotubes. The HRTEM images clearly exhibit characteristic features of multiwalled carbon nanotubes. Microstructural investigation provides evidence that both the metal catalyst and the precursor can be used to synthesize carbon nanotubes. The Raman spectrum shows a stronger peak at about 1580 cm-1 indicating formation of a well-graphitized carbon nanotube. The degree of carbon nanotube graphitization is high and is in good agreement with the HRTEM result. From field emission measurements, the lowest onset field is about 1.0 V/μm and can be attributed to highly sharp tips and the high density of carbon nanotubes. Based on microstructure characterization and field emission measurements, the influence on field emission properties including turn on voltage and threshold voltage of carbon nanotubes synthesized from different sources is discussed.

Improved Field-Emission Properties of Carbon Nanotube Field-Emission Arrays by Controlled Density Growth of Carbon Nanotubes

2005 ◽  
Vol 44 (1A) ◽  
pp. 365-370 ◽  
Author(s):  
Chuan-Ping Juan ◽  
Kuo-Ji Chen ◽  
Chun-Chien Tsai ◽  
Kao-Chao Lin ◽  
Wei-Kai Hong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Field Emission ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Density Growth ◽  
Field Emission Arrays

Nanomeasurements in Transmission Electron Microscopy

2000 ◽  
Vol 6 (3) ◽  
pp. 224-230
Author(s):  
Z.L. Wang ◽  
P. Poncharal ◽  
W.A. de Heer
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Carbon Nanotube ◽  
Field Emission ◽  
Structural Damage ◽  
Measurement Techniques ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Bending Modulus ◽  
Transmission Electron

Abstract Nanomaterials have attracted a great deal of research interest recently. The small size of nanostructures constrains the applications of well-established testing and measurement techniques, thus new methods and approaches must be developed for quantitative measurement of the properties of individual nanostructures. This article reports our progress in using in situ transmission electron microscopy to measure the electrical, mechanical, and field-emission properties of individual carbon nanotubes whose microstructure is well-characterized. The bending modulus of a single carbon nanotube has been measured by an electric field-induced resonance effect. A nanobalance technique is demonstrated that can be applied to measure the mass of a tiny particle as light as 22 fg (1 fg = 10−15 g), the smallest balance in the world. Quantum conductance was observed in defect-free nanotubes, which led to the transport of a superhigh current density at room temperature without heat dissipation. Finally, the field-emission properties of a single carbon nanotube are observed, and the field-induced structural damage is reported.

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.

Nanomeasurements in Transmission Electron Microscopy

2000 ◽  
Vol 6 (3) ◽  
pp. 224-230 ◽  
Author(s):  
Z.L. Wang ◽  
P. Poncharal ◽  
W.A. de Heer
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Carbon Nanotube ◽  
Field Emission ◽  
Structural Damage ◽  
Measurement Techniques ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Bending Modulus ◽  
Transmission Electron

AbstractNanomaterials have attracted a great deal of research interest recently. The small size of nanostructures constrains the applications of well-established testing and measurement techniques, thus new methods and approaches must be developed for quantitative measurement of the properties of individual nanostructures. This article reports our progress in using in situ transmission electron microscopy to measure the electrical, mechanical, and field-emission properties of individual carbon nanotubes whose microstructure is well-characterized. The bending modulus of a single carbon nanotube has been measured by an electric field-induced resonance effect. A nanobalance technique is demonstrated that can be applied to measure the mass of a tiny particle as light as 22 fg (1 fg = 10−15 g), the smallest balance in the world. Quantum conductance was observed in defect-free nanotubes, which led to the transport of a superhigh current density at room temperature without heat dissipation. Finally, the field-emission properties of a single carbon nanotube are observed, and the field-induced structural damage is reported.

Field emission properties of laser ablated multi-walled carbon nanotubes

2018 ◽  
Vol 32 (19) ◽  
pp. 1840045
Author(s):  
Pankaj Koinkar ◽  
Yu Ohsumi ◽  
Makoto Kanazawa ◽  
Akihiro Furube ◽  
Dnyaneshwar Gavhane ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Laser Ablation ◽  
Field Emission ◽  
Emission Characteristics ◽  
Emission Properties ◽  
Ablation Time ◽  
Field Emission Properties ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In the present study, the field emission properties of multi-walled carbon nanotubes (MWCNTs) treated with laser ablation have been investigated. The MWCNTs were synthesized by chemical vapor deposition method. The laser ablation treatment was performed in liquid medium for laser ablation time of 40 min and 60 min. The morphology of MWCNTs films was characterized by using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. The results exhibit that the field emission properties of MWCNTs are dependent on the laser ablation time. The Raman spectra of laser-ablated MWCNTs clearly showed disorder and increase in graphitic content. The SEM and TEM results clearly revealed the separation of MWCNTs after laser ablation treatment. The field emission characteristics of the MWCNTs showed that the turn-on fields and current density are improved for the nanotubes treated with laser ablation. The enhancement in the field emission characteristics of MWCNTs is attributed to the disorder as well as the increase in the aspect ratio which causes more pathways for electron emission.

ZnO quantum dots decorated on optimized carbon nanotube intramolecular junctions exhibit superior field emission properties

RSC Advances ◽  
2016 ◽  
Vol 6 (65) ◽  
pp. 60877-60887 ◽  
Author(s):  
Chia-Te Hu ◽  
Jyh-Ming Wu ◽  
Jien-Wei Yeh ◽  
Han C. Shih
Keyword(s):  
Carbon Nanotubes ◽  
Quantum Dots ◽  
Zinc Oxide ◽  
Carbon Nanotube ◽  
Quantum Well ◽  
Field Emission ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Zno Quantum Dots

Sensitive optical and superior field emission properties can be attained through the use of ZnO selective quantum well heterostructures grown on carbon nanotubes to fabricate carbon-zinc-oxide (CZO) nanotubes.

Field Emission Properties of Carbon Nanotubes Synthesized by High Temperature Arc Method and Low Temperature CVD Method

2003 ◽  
Vol 772 ◽  
Author(s):  
Hong-Jen Lai ◽  
Sheng-Chin Kung ◽  
Chih-Ming Hsu ◽  
Bean-Jon Li ◽  
Ching-Cheng Lin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Temperature ◽  
Carbon Nanotube ◽  
Low Temperature ◽  
Field Emission ◽  
Layer Structure ◽  
Emission Measurement ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Graphitic Layer

AbstractThe microstructure and field emission properties of multi walled carbon nanotubes (MWNTs) were investigated. The comparisons are made between MWNTs synthesized by high temperature arc methods and low temperature CVD methods. The results of the HRTEM image clearly exhibit characteristic features of a multi walled carbon nanotube. Raman spectrum shows a stronger peak at about 1580 cm-1 indicating the formation of a well-graphitized carbon nanotube. It also shows the high temperature arc process can produce MWNT that has perfect graphitic layer structure and high I(G)/I(D) ratio. The Ratio of G-line (sp2 bond) and D-line(sp3 bond) of these MWNTs are about 2.8 to 5.2. From the field emission measurement, the low onset field is about 1.4 to 2.4 V/ m, and can be attributed to highly sharp tips and high electric conductivity of MWNTs.

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