scholarly journals Structural Modifications of Multi-walled Carbon Nanotubes of Different Diameters through Electron Beam Irradiation

1970 ◽  
Vol 46 (1) ◽  
pp. 9-16 ◽  
Author(s):  
AKM Fazle Kibria
Keyword(s):  
Carbon Nanotubes ◽  
Electron Beam ◽  
Electron Irradiation ◽  
Structural Modifications ◽  
Multi Walled Carbon Nanotubes ◽  
Graphitic Shell ◽  
Different Diameters ◽  
Walled Carbon Nanotubes ◽  
Induced Defects ◽  
Irradiation Induced Defects

The effects of irradiation on the structure of purified multi-walled carbon nanotubes (MWCNTs) having 6-19 graphitic shells and outer diameters of 8.15-17.11 nm were investigated using electron beam of energies 200 keV and dose of 2.16 x 1017 e cm-2s-1. It was observed that the electron irradiation created a number of chronological alterations in the tube structures. These were identified to be tube contraction, destruction of the innermost graphitic shell, deformation of graphitic shells and its proliferation, break down of the graphitic shells and their spreading into the tube hole and finally the destruction of the whole tube. MWCNTs having the largest innermost diameter found suffer from the highest contraction. The tube contraction behavior found stops when the innermost graphitic shell starts to destroy. Irradiation affected the innermost graphitic shell first and that of the smallest diameter was the more rapidly. It occurred probably due to having the highest curvature value. Tubes having inner shell of diameter about 4.8 nm suffer from fractional destruction within 5-15 s of irradiation exposure. Such a shell was ruined within 1 minute of irradiation exposure but that of diameter 7.0 nm was survived up to 2 minutes. It seems that the irradiation induced defects created in the MWCNTs can be used for the diversified applications of nanotubes such as the hydrogen storage enhancement in them. Keywords: Carbon nanotube; Electron irradiation; Tube contraction; Innermost shell; Defect. DOI: http://dx.doi.org/10.3329/bjsir.v46i1.8099 Bangladesh J. Sci. Ind. Res. 46(1), 9-16, 2011  

scholarly journals Electron Irradiation of Carbon Nanotubes: A Credible Defect Generation Technique to Improve Hydrogen Storage for Future

1970 ◽  
Vol 45 (4) ◽  
pp. 337-344
Author(s):  
AKM Fazle Kibria
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Storage ◽  
Electron Irradiation ◽  
Topological Defects ◽  
Ccd Camera ◽  
Atomic Scale ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Induced Defects

Electron irradiation technique was employed to induce atomic-scale defects in the walls of multi-walled carbon nanotubes (MWCNTs) using electron beam of energy 120 keV and dose of 2.16 x 1017 electrons cm-2s-1. Structural transformations of the tubes attributable to irradiation exposure were monitored by high-resolution transmission electron microscope (HRTEM) and recorded by the connected CCD camera. It was observed that only five seconds (5s) of irradiation could shrink MWCNTs of diameter 15 nm having 11 graphitic layers towards the interior hole up to 2.2 nm and bend the tube. Irradiation incorporated vacancies and the topological defects generated on the tube walls were responsible for it. It was found that the electron irradiation could destroy such MWCNTs within 9 minutes. It was speculated that irradiation induced vacancies and their adjacent dangling bonds (DBs), the pentagon and octagon rings originated from the transformations of vacancies are highly influential to enhance the hydrogen storage in MWCNTs. From the time dependent HRTEM observations, it was found out that electron irradiation period less than 4 minutes is the optimum exposure time to achieve benefit of hydrogen storage in the MWCNTs as used in the present investigation. Electron irradiation induced defects could be used to enhance hydrogen storage in MWCNTs for future applications. Keywords: Carbon nanotube; Electron irradiation; Defect; Vacancy; Hydrogen storage DOI: 10.3329/bjsir.v45i4.7378 Bangladesh J. Sci. Ind. Res. 45(4), 337-344, 2010

scholarly journals Characterization of ion-irradiation-induced defects in multi-walled carbon nanotubes

2011 ◽  
Vol 13 (7) ◽  
pp. 073004 ◽  
Author(s):  
Ossi Lehtinen ◽  
Timur Nikitin ◽  
Arkady V Krasheninnikov ◽  
Litao Sun ◽  
Florian Banhart ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Ion Irradiation ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Induced Defects ◽  
Irradiation Induced Defects

Study of Rheological Properties of Carbon Nanotube-Reinforced Ultrafine Cement Grouting Materials

2021 ◽  
pp. 1-44
Author(s):  
Yunxiao Liu ◽  
Jiahang Zhang ◽  
Yinyin Chi
Keyword(s):  
Carbon Nanotubes ◽  
Rheological Properties ◽  
Polyvinyl Pyrrolidone ◽  
Cement Grouting ◽  
Grouting Material ◽  
Multi Walled Carbon Nanotubes ◽  
Different Diameters ◽  
Grouting Materials ◽  
Walled Carbon Nanotubes ◽  
Ultrafine Cement

In this study, three different diameters of multi-walled carbon nanotubes (MWCNTs) dispersed by polyvinyl pyrrolidone (PVP) were used to reinforce superfine cement grouting materials. The effect of MWCNTs and polyvinyl pyrrolidone (PVP) on the rheological properties of grouting material were accordingly studied. It was found that the yield stress (τ0) and plastic viscosity (η) were slightly decreased when PVP content was low and increased when the PVP content increased. The effect of MWCNT diameter on τ0 was not found to be clear but was more significant on η. The smaller MWCNT diameter was, the more quickly η increase. It was also found that the thixotropic ring area was increased as the MWCNTs content increased. The addition of PVP and MWCNTs caused an increase in the number of entanglement points in different scales, which was the main reason for the viscosity and thixotropy increase. Therefore, the rheological properties of superfine cement grouting material should be adjusted when MWCNTs were added as a reinforcing component. Due to the wrapping of PVP on cement particles which isolates the contacting part between the water and the cement particles, it slows down the cement's hydration rate thus slows down the fluidity loss of the slurry.

Hydrogen adsorption/desorption behavior of multi-walled carbon nanotubes with different diameters

Carbon ◽  
2003 ◽  
Vol 41 (13) ◽  
pp. 2471-2476 ◽  
Author(s):  
Peng-Xiang Hou ◽  
Shi-Tao Xu ◽  
Zhe Ying ◽  
Quan-Hong Yang ◽  
C. Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Adsorption ◽  
Multi Walled Carbon Nanotubes ◽  
Different Diameters ◽  
Adsorption Desorption ◽  
Walled Carbon Nanotubes

scholarly journals Gas-sensitive properties of individual carbon nanotubes modified by ion and electron irradiation

2020 ◽  
pp. 89-93
Author(s):  
N. A. Davletkildeev ◽  
Keyword(s):  
Carbon Nanotubes ◽  
Electron Irradiation ◽  
Gas Sensitivity ◽  
Resistance Change ◽  
Type Conductivity ◽  
Nitrogen Doped ◽  
Multi Walled Carbon Nanotubes ◽  
Argon Ions ◽  
P Type ◽  
Walled Carbon Nanotubes

The time characteristics of resistance change of individual nitrogen-doped multi-walled carbon nanotubes (N-MWCNTs), initial and irradiated with electrons, protons and argon ions has been measured upon exposure to ammonia and nitrogen dioxide. It is found that the initial N-MWCNTs have n-type conductivity, N-MWCNTs irradiated with protons and argon ions have p-type conductivity, and those irradiated with electrons have n-type conductivity. The relative gas sensitivity of individual N-MWCNTs, initial and irradiated with ions and electrons, has been determined

Coating Multi-Walled Carbon Nanotubes with CdS Nanoparticles Through Electron Beam Irradiation

2009 ◽  
Vol 9 (3) ◽  
pp. 2088-2091
Author(s):  
Haijiao Zhang ◽  
Xiaojuan Wan ◽  
Huijiao Guo ◽  
Zheng Jiao ◽  
Bing Zhao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Cds Nanoparticles ◽  
Beam Irradiation ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes
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