Unraveling van Hove singularities in x-ray absorption response of single-wall carbon nanotubes

2007 ◽  
Vol 75 (23) ◽  
Author(s):  
C. Kramberger ◽  
H. Rauf ◽  
H. Shiozawa ◽  
M. Knupfer ◽  
B. Büchner ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
X Ray ◽  
Van Hove Singularities ◽  
X Ray Absorption

scholarly journals Observation and Characterization of Fragile Organometallic Molecules Encapsulated in Single-Wall Carbon Nanotubes

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Daisuke Ogawa ◽  
Ryo Kitaura ◽  
Takeshi Saito ◽  
Shinobu Aoyagi ◽  
Eiji Nishibori ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Yield ◽  
Single Wall Carbon Nanotubes ◽  
X Ray Diffraction ◽  
Single Wall Carbon ◽  
X Ray ◽  
Transmission Electron ◽  
Organometallic Molecules ◽  
X Ray Absorption

Thermally fragile tris(η5-cyclopentadienyl)erbium (ErCp3) molecules are encapsulated in single-wall carbon nanotubes (SWCNTs) with high yield. We realized the encapsulation of ErCp3with high filling ratio by using high quality SWCNTs at an optimized temperature under higher vacuum. Structure determination based on high-resolution transmission electron microscope observations together with the image simulations reveals the presence of almost free rotation of each ErCp3molecule in SWCNTs. The encapsulation is also confirmed by X-ray diffraction. Trivalent character of Er ions (i.e., Er3+) is confirmed by X-ray absorption spectrum.

scholarly journals Anisotropy in the X-ray absorption of vertically aligned single wall carbon nanotubes

2007 ◽  
Vol 244 (11) ◽  
pp. 3978-3981 ◽  
Author(s):  
C. Kramberger ◽  
H. Shiozawa ◽  
H. Rauf ◽  
A. Grüneis ◽  
M. H. Rümmeli ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
X Ray ◽  
Vertically Aligned ◽  
X Ray Absorption

Enhanced yield strength in iron nanocomposite with in situ grown single-wall carbon nanotubes

2006 ◽  
Vol 21 (2) ◽  
pp. 522-528 ◽  
Author(s):  
A. Goyal ◽  
D.A. Wiegand ◽  
F.J. Owens ◽  
Z. Iqbal
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Yield Strength ◽  
Vapor Deposition ◽  
Single Wall Carbon Nanotubes ◽  
Iron Matrix ◽  
Single Wall Carbon ◽  
X Ray ◽  
Micro Raman Spectroscopy

The yield strength of iron-carbon nanotube composites fabricated by in situ chemical vapor deposition of 2.2 vol% single-wall carbon nanotubes (SWNTs) inside an iron matrix showed substantial enhancement up to 45%, relative to that of similarly treated pure iron samples without carbon nanotubes of the same piece density. The work hardening coefficient and the Vickers hardness coefficient also significantly increased in these composites relative to the reference samples. X-ray diffraction together with energy dispersive x-ray measurements and micro-Raman spectroscopy indicated no concomitant formation of carbides and very little amorphous carbon during the vapor deposition process. Micro-Raman spectroscopy and scanning and transmission electron microscopy showed spectral signatures and images, respectively, indicating the formation and dispersion of SWNTs within the cavities of the iron matrix. It is suggested that the increased strength of the nanocomposites was due to the mechanical support provided to these cavities by the extremely strong SWNTs.

Diameter Analysis of Rebundled Single-Wall Carbon Nanotubes Using X-ray Diffraction: Verification of Chirality Assignment Based on Optical Spectra

2008 ◽  
Vol 112 (41) ◽  
pp. 15997-16001 ◽  
Author(s):  
Yasumitsu Miyata ◽  
Kazuhiro Yanagi ◽  
Yutaka Maniwa ◽  
Takeshi Tanaka ◽  
Hiromichi Kataura
Keyword(s):  
Carbon Nanotubes ◽  
Optical Spectra ◽  
Single Wall Carbon Nanotubes ◽  
X Ray Diffraction ◽  
Single Wall Carbon ◽  
X Ray

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.

Utilizing Old Egyptian Wisdom for Stabilization of Individual Carbon Nanotubes in Aqueous Dispersions

2001 ◽  
Vol 706 ◽  
Author(s):  
Rajdip Bandyopadhyaya ◽  
Einat Nativ-Roth ◽  
Oren Regev ◽  
Rachel Yerushalmi Rozen
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Aqueous Solutions ◽  
Gum Arabic ◽  
Single Wall Carbon Nanotubes ◽  
Aqueous Dispersions ◽  
Single Wall Carbon ◽  
X Ray ◽  
X Ray Scattering ◽  
The Individual

AbstractThe tendency of single wall carbon nanotubes to organize into crystalline ropes and the aggregation of the ropes into tangled networks act as an obstacle for most applications, and diminishes the special properties of the individual tubes. We describe a procedure for dispersing as-produced nanotube powder in aqueous solutions of Gum Arabic. Dispersion results in spontaneous exfoliation of nanotubes ropes into individual tubes, as demonstrated via x-ray scattering and electron microscopy.

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