scholarly journals Growth Termination and Multiple Nucleation of Single-Wall Carbon Nanotubes Evidenced by in Situ Transmission Electron Microscopy

ACS Nano ◽  
2017 ◽  
Vol 11 (5) ◽  
pp. 4483-4493 ◽  
Author(s):  
Lili Zhang ◽  
Maoshuai He ◽  
Thomas W. Hansen ◽  
Jens Kling ◽  
Hua Jiang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Transmission Electron

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.

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.

Characterization of Magnetically Aligned Single Wall Carbon Nanotubes Using Transmission Electron Microscopy

2000 ◽  
Vol 6 (S2) ◽  
pp. 26-27
Author(s):  
Brian W. Smith ◽  
David E. Luzzi
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
Single Wall Carbon Nanotubes ◽  
X Rays ◽  
Single Wall Carbon ◽  
Transmission Electron ◽  
Atomic Scattering ◽  
Scattering Factor

The ability to align single wall carbon nanotubes (SWNTs) is paramount for harnessing their remarkable anisotropic electronic and mechanical properties. D.A. Walters et al. (Rice Univ.) have succeeded in aligning milligram quantities of SWNTs using a strong magnetic field. The nanotubes were aligned in suspension and simultaneously filtered to produce a thin membrane. However, small angle X-ray scattering (SAXS) — the traditional technique for obtaining fiber patterns — has proven ineffective in determining the degree of alignment due in part to carbon's weak atomic scattering factor for X-rays.In the present work we succeed in quantitatively characterizing this membrane using transmission electron microscopy (TEM). A self-supporting sample was prepared by peeling ∼ 0.5 mm long strips from the material. TEM images reveal that the membrane itself is not a single, large bundle (i.e. rope) of SWNTs. Instead, it has a prominent texture, corresponding to many ropes aligned parallel to the direction of the applied magnetic field.

Stability of single-wall carbon nanotubes under hydrothermal conditions

2002 ◽  
Vol 17 (4) ◽  
pp. 734-737 ◽  
Author(s):  
S. Srikanta Swamy ◽  
Jose Maria Calderon-Moreno ◽  
Masahiro Yoshimura
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
Single Wall Carbon Nanotubes ◽  
Hydrothermal Conditions ◽  
Short Term Treatment ◽  
Stability Range ◽  
Single Wall Carbon ◽  
Transmission Electron ◽  
The Stability

The stability of single-wall carbon nanotubes under hydrothermal conditions (100 MPa pressure, from 30 min to 48 h in the temperature range from 200 to 800 °C) has been investigated. The resultant products were characterized by Raman spectroscopy, x-ray diffraction, and transmission electron microscopy. The stability range of single-wall carbon nanotubes (SWCNTs) under hydrothermal conditions suggests that they, similar to fullerenes, can only survive mild and short-term treatment in high-temperature, high-pressure water. SWCNTs gradually transform into multiwall carbon nanotubes (MWCNTs) and polyhedral graphitic nanoparticules. After 48 h at 750 °C only the Raman spectra characteristic of graphitic carbon were observed. Transmission electron microscopy revealed that after 800 °C and 48 h of treatment SWCNTs fully transformed into MWCNTs and polyhedral carbon nanoparticles.

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.

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