Encapsulated Fullerenes Within Single Wall Carbon Nanotubes

1999 ◽  
Vol 5 (S2) ◽  
pp. 182-183
Author(s):  
Brian W. Smith ◽  
David E. Luzzi
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Pulsed Laser ◽  
Irradiation Damage ◽  
Laser Vaporization ◽  
Single Wall Carbon Nanotubes ◽  
Phase Object ◽  
Parallel Lines ◽  
Weak Phase ◽  
Transmission Electron

It is well documented that the pulsed laser vaporization of graphite produces both carbon nanotubes and C60 in the presence of certain metallic catalysts. In nanotube production most of the Ceo is removed along with other residual contaminants during succeeding purification and annealing steps. The possibility of C60 becoming trapped inside a nanotube during this elaborate sequence has been considered but not previously detected.Nanotubes are observed with high resolution transmission electron microscopy under conditions chosen to minimize both exposure time and irradiation damage. Since a nanotube satisfies the weak phase object approximation, its image is a projection of the specimen -potential in the direction of the electron beam. The image has maximum contrast where the beam encounters the most carbon atoms, which occurs where it is tangent to the tube’s walls. Thus, the image consists of two dark parallel lines whose separation is equal to the tube diameter, 1.4 nm.

Synthesis and Characterization of Carbon Nanotubes from Palm Oil by Aerosol-Assisted CVD

2013 ◽  
Vol 667 ◽  
pp. 218-223
Author(s):  
M. Maryam ◽  
A.B. Suriani ◽  
M.S. Shamsudin ◽  
Mohamad Rusop Mahmood
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Palm Oil ◽  
Deposition Temperature ◽  
Multiwall Carbon Nanotubes ◽  
Single Wall Carbon Nanotubes ◽  
X Ray ◽  
Weight Percentage ◽  
Transmission Electron ◽  
Reaction Furnace

This paper will report on the synthesis of bundles of aligned single wall carbon nanotubes (SWCNTs) and multiwall carbon nanotubes (MWCNTs) from palm oil precursor and ferrocene as catalyst source by two stage aerosol-assisted CVD system at various deposition temperature ranging from 700-900oC. Palm oil was pyrolised into the furnace which contained the catalyst source producing black substances at the wall of the reaction furnace which were then collected to be characterized. Field emission scanning electron microscopy equipped with energy dispersive X-ray was used to obtain weight percentage, identification of samples and image of CNTs which showed different structures and diameters of CNTs relative to the deposition temperature of furnace. Raman Spectroscopy was used to further study the quality and identification of samples and finally X-ray powder diffraction was used to determine the crystalinity of samples. Individual micrograph of MWNTs at optimized deposition temperature was also obtained from the high resolution transmission electron microscopy.

scholarly journals Filling Single Wall Carbon Nanotubes with Metal Chloride and Metal Nanowires and Imaging with Scanning Transmission Electron Microscopy

2001 ◽  
Vol 706 ◽  
Author(s):  
Satishkumar B. Chikkannanavar ◽  
Andreas Taubert ◽  
David E. Luzzi
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
Scanning Transmission Electron Microscopy ◽  
Metal Chloride ◽  
Single Wall Carbon Nanotubes ◽  
Metal Nanowires ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission

AbstractNanowires of magnetic metals (Ho, Gd) have been synthesized inside the hollow interior of single wall carbon nanotubes by the sealed-tube reaction. Amongst the d- and f-series metal chlorides investigated in this study, HoCl3 and GdCl3 fill the SWNTs to a significantly higher extent than FeCl2 and CoCl2. HoCl3 and GdCl3 nanowires have been transformed into the respective metal nanowires via the reduction of the chloride nanowires. The nanowires have been imaged using high-resolution transmission electron microscopy and scanning transmission electron microscopy (STEM). X-ray energy dispersive spectroscopy carried out in conjunction with STEM confirmed the presence of metal chloride and metal nanowires.

scholarly journals Single Wall Carbon Nanotubes Filled with Metallocenes: a First Example of Non-Fullerene Peapods

2001 ◽  
Vol 706 ◽  
Author(s):  
F. Stercel ◽  
N. M. Nemes ◽  
J. E. Fischer ◽  
D. E. Luzzi
Keyword(s):  
Carbon Nanotubes ◽  
Vapor Phase ◽  
The Other ◽  
Irradiation Damage ◽  
Single Wall Carbon Nanotubes ◽  
Chemical Bonds ◽  
Single Wall Carbon ◽  
X Ray ◽  
Transmission Electron ◽  
Iron Chromium

AbstractWe report the synthesis and analysis of metallocenes (ferrocene, chromocene, ruthenocene, vanadocene, tungstenocene-dihydride) encapsulated in single wall carbon nanotubes (SWNTs). In the case of ferrocene, efficient filling of the SWNTs was accomplished from both the liquid and the vapor phase. The other two metallocenes were filled from the vapor phase. High resolution transmission electron microscopy reveals single molecular chains of metallocenes inside SWNTs. Molecules move under the electron beam in the SWNTs indicating the absence of strong chemical bonds between each other and the SWNT wall. Their movement freezes after short illumination as a result of irradiation damage. Energy dispersive X-ray spectrometry confirms the presence of iron, chromium, ruthenium, vanadium and tungsten.

In-situ Observations of Restructuring Carbon Nanotubes via Low-voltage Aberration-corrected Transmission Electron Microscopy

2011 ◽  
Vol 1284 ◽  
Author(s):  
Felix Börrnert ◽  
Alicja Bachmatiuk ◽  
Sandeep Gorantla ◽  
Jamie H. Warner ◽  
Bernd Büchner ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
Carbon Nanostructures ◽  
Low Voltage ◽  
Single Wall Carbon Nanotubes ◽  
Structure And Dynamics ◽  
Transmission Electron ◽  
Aberration Corrected

ABSTRACTThe molecular structure and dynamics of carbon nanostructures is much discussed throughout the literature, mostly from the theoretical side because of a lack of suitable experimental techniques to adequately engage the problem. A technique that has recently become available is low-voltage aberration-corrected transmission electron microscopy. It is a valuable tool with which to directly observe the atomic structure and dynamics of the specimen in situ. Time series aberration-corrected low-voltage transmission electron microscopy is used to study the dynamics of single-wall carbon nanotubes in situ. We confirm experimentally previous theoretical predictions for the agglomeration of adatoms forming protrusions and subsequent removal. A model is proposed how lattice reconstruction sites spread. In addition, the complete healing of a multi-vacancy consisting of ca. 20 missing atoms in a nanotube wall is followed.

Studies on the Preparation and Characterisation of Carbon Nanostructures

2004 ◽  
Vol 99-100 ◽  
pp. 269-272
Author(s):  
R.J. Kalenczuk ◽  
E. Borowiak-Palen ◽  
T. Pichler ◽  
M. Rümmeli ◽  
J. Fink
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Carbon Nanostructures ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Single Wall Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
New Class ◽  
Chemically Modified ◽  
Transmission Electron

We present a study on the preparation of multiwalled carbon nanotubes (MWCNT) using chemical vapour deposition (CVD). The CVD produced MWCNT and single wall carbon nanotubes (SWCNT) produced with a laser ablation technique were then chemically modified by substituting carbon atoms with boron and nitrogen atoms. The morphology and the crystal structure of the new class of nanostructures were analyzed by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM).

Synthesis of C60 Chains Contained Within Carbon Nanotubes

1999 ◽  
Vol 593 ◽  
Author(s):  
Brian W. Smith ◽  
David E. Luzzi
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
Vapor Phase ◽  
Single Wall Carbon Nanotubes ◽  
Molecular Assemblies ◽  
Single Wall Carbon ◽  
Transmission Electron ◽  
Bulk Production

ABSTRACTWe have recently discovered self-assembled chains of C60 molecules contained within single wall carbon nanotubes (SWNTs). Using in situ transmission electron microscopy studies, we show a route by which such ‘peapod’ structures can be synthesized. The results indicate that exterior C60 molecules arrive at the nanotubes from the vapor phase and subsequently enter, presumably through open ends or sidewall defects. The methods discussed in this work provide a means for the bulk production of these molecular assemblies.

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