Field electron emission characteristics of plasma treated carbon nanotubes

2015 ◽  
Vol 29 (06n07) ◽  
pp. 1540030 ◽  
Author(s):  
Pankaj M. Koinkar ◽  
Daisuke Yonekura ◽  
Ri-Ichi Murakami ◽  
Toshihiro Moriga ◽  
Mahendra A. More
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Plasma Treatment ◽  
Field Emission ◽  
Treatment Duration ◽  
Hydrogen Plasma ◽  
Chemical Vapor ◽  
Structural Defects ◽  
Chemical Vapor Deposition Method ◽  
Emission Characteristics

This paper reports the effect of hydrogen ( H 2) plasma treatment on field emission property of double walled carbon nanotubes (DWCNTs) synthesized by using chemical vapor deposition method. The hydrogen plasma treatment was carried out for various duration. The DWCNTs films were characterized by using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. The results showed that the field emission properties of DWCNTs were influenced with increasing plasma treatment duration. The Raman spectra of samples clearly show structural defects after hydrogen plasma treatment. It is observed that the change in the field emission characteristics of DWCNTs is attributed to the structural defects due to the H 2 plasma and depends on the plasma treatment duration.

scholarly journals Bromate Removal from Water Using Doped Iron Nanoparticles on Multiwalled Carbon Nanotubes (CNTS)

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Aasem Zeino ◽  
Abdalla Abulkibash ◽  
Mazen Khaled ◽  
Muataz Atieh
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Adsorption Capacity ◽  
Multiwalled Carbon Nanotubes ◽  
Iron Nanoparticles ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Method ◽  
Scanning Calorimetry ◽  
Multiwalled Carbon ◽  
Transmission Electron

The raw carbon nanotubes (CNTs) were prepared by the floating catalyst chemical vapor deposition method. The raw carbon nanotubes were functionalized, impregnated with iron nanoparticles, and characterized using high resolution transmission electron microscopy (HRTEM), scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), and thermogravimetric analysis (TGA). The three types of these multiwalled carbon nanotubes were applied as adsorbents for the removal of bromate from drinking water. The effects of the pH, the concentration ofBrO3-anion, the adsorbent dose, the contact time, and the coanions on the adsorption process have been investigated. The results concluded that the highest adsorption capacities were 0.3460 and 0.3220 mg/g through using CNTs-Fe and raw CNTs, respectively, at the same conditions. The results showed that the CNTs-Fe gives higher adsorption capacity compared with the raw CNTs and the functionalized CNTs. The presence of nitrate (NO3-) in the solution decreases the adsorption capacity of all CNTs compared with chloride (Cl-) associated with pH adjustment caused by nitric acid or hydrochloric acid, respectively. However, the adsorption of all MWNCTs types increases as the pH of solution decreases.

Enhanced field emission from carbon nanotubes by hydrogen plasma treatment

2002 ◽  
Vol 81 (9) ◽  
pp. 1690-1692 ◽  
Author(s):  
C. Y. Zhi ◽  
X. D. Bai ◽  
E. G. Wang
Keyword(s):  
Carbon Nanotubes ◽  
Plasma Treatment ◽  
Field Emission ◽  
Hydrogen Plasma

Improvement of field emission characteristics of tungsten oxide nanowires by hydrogen plasma treatment

2008 ◽  
Vol 84 (1) ◽  
pp. 16001 ◽  
Author(s):  
W.-C. Tsai ◽  
S.-J. Wang ◽  
C.-L. Chang ◽  
C.-H. Chen ◽  
R.-M. Ko ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Tungsten Oxide ◽  
Field Emission ◽  
Hydrogen Plasma ◽  
Emission Characteristics ◽  
Oxide Nanowires

Temperature Effects on the Production of Carbon Nanotubes from Palm Oil by Thermal Chemical Vapor Deposition Method

2011 ◽  
Vol 364 ◽  
pp. 359-362 ◽  
Author(s):  
M. S. Azmina ◽  
A.B. Suriani ◽  
A.N. Falina ◽  
M. Salina ◽  
M. Rusop
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Palm Oil ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Synthesis Temperature ◽  
Chemical Vapor Deposition Method ◽  
Deposition Method ◽  
Synthesis Time ◽  
Scanning Transmission

In this study we report the effect of various synthesis temperatures of 600 - 1000°C for the synthesis of carbon nanotubes (CNT). Bio-hydrocarbon precursor namely palm oil was utilized as a starting material by thermal vapor deposition method. Ferrocene at 5.33 wt% was directly mixed with palm oil precursor for 30 mins synthesis time. The prepared CNT was collected from the furnace wall and then characterized by field emission scanning electron microscopy, scanning transmission electron microscopy, fourier transform infrared spectroscopy and thermogravimetric analysis. The density, diameter and the purities of the CNT were found to be highly dependent on the temperature changes. The synthesis temperature of 800°C was considered to be the optimum temperature for higher quality and quantity of CNT production.

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