X-ray Absorption Spectroscopic Investigation of Partially Reduced Cobalt Species in Co−MCM-41 Catalysts during Synthesis of Single-Wall Carbon Nanotubes

2005 ◽  
Vol 109 (34) ◽  
pp. 16332-16339 ◽  
Author(s):  
Dragos Ciuparu ◽  
Peter Haider ◽  
Marcos Fernández-García ◽  
Yuan Chen ◽  
Sangyun Lim ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Spectroscopic Investigation ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
X Ray ◽  
X Ray Absorption ◽  
Mcm 41 ◽  
Cobalt Species

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.

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 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

Effect of Manganese Addition to the Co-MCM-41 Catalyst in the Selective Synthesis of Single Wall Carbon Nanotubes

2009 ◽  
Vol 113 (52) ◽  
pp. 21611-21620 ◽  
Author(s):  
Codruta Zoican Loebick ◽  
Salim Derrouiche ◽  
Nebojsa Marinkovic ◽  
Chuan Wang ◽  
Frank Hennrich ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Wall Carbon Nanotubes ◽  
Selective Synthesis ◽  
Single Wall Carbon ◽  
Mcm 41

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.

Mechanism of Cobalt Cluster Size Control in Co-MCM-41 during Single-Wall Carbon Nanotubes Synthesis by CO Disproportionation

2004 ◽  
Vol 108 (40) ◽  
pp. 15565-15571 ◽  
Author(s):  
Dragos Ciuparu ◽  
Yuan Chen ◽  
Sangyun Lim ◽  
Yanhui Yang ◽  
Gary L. Haller ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Cluster Size ◽  
Size Control ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Cobalt Cluster ◽  
Co Disproportionation ◽  
Mcm 41
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