Effect of Rare-Earth Component of the RE/Ni Catalyst on the Formation and Nanostructure of Single-Walled Carbon Nanotubes

2006 ◽  
Vol 110 (31) ◽  
pp. 15284-15290 ◽  
Author(s):  
Mingguang Yao ◽  
Bingbing Liu ◽  
Yonggang Zou ◽  
Lin Wang ◽  
Tian Cui ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Rare Earth ◽  
Single Walled Carbon Nanotubes ◽  
Ni Catalyst ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

scholarly journals Metal Cluster Size-Dependent Activation Energies of Growth of Single-Chirality Single-Walled Carbon Nanotubes Inside Metallocene-Filled Single-Walled Carbon Nanotubes

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2649
Author(s):  
Marianna V. Kharlamova ◽  
Christian Kramberger
Keyword(s):  
Carbon Nanotubes ◽  
Metal Cluster ◽  
Large Diameter ◽  
Single Walled Carbon Nanotubes ◽  
Activation Energies ◽  
Tube Diameter ◽  
Ni Catalyst ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Catalytic Particles

By combining in situ annealing and Raman spectroscopy measurements, the growth dynamics of nine individual-chirality inner tubes (8,8), (12,3), (13,1), (9,6), (10,4), (11,2), (11,1), (9,3) and (9,2) with diameters from ~0.8 to 1.1 nm are monitored using a time resolution of several minutes. The growth mechanism of inner tubes implies two successive stages of the growth on the carburized and purely metallic catalytic particles, respectively, which are formed as a result of the thermally induced decomposition of metallocenes inside the outer SWCNTs. The activation energies of the growth on carburized Ni and Co catalytic particles amount to 1.85–2.57 eV and 1.80–2.71 eV, respectively. They decrease monotonically as the tube diameter decreases, independent of the metal type. The activation energies of the growth on purely metallic Ni and Co particles equal 1.49–1.91 eV and 0.77–1.79 eV, respectively. They increase as the tube diameter decreases. The activation energies of the growth of large-diameter tubes (dt = ~0.95–1.10 nm) on Ni catalyst are significantly larger than on Co catalyst, whereas the values of small-diameter tubes (dt = ~0.80–0.95 nm) are similar. For both metals, no dependence of the activation energies on the chirality of inner tubes is observed.

Anchoring of Rare-Earth-Based Single-Molecule Magnets on Single-Walled Carbon Nanotubes

2009 ◽  
Vol 131 (42) ◽  
pp. 15143-15151 ◽  
Author(s):  
Svetlana Kyatskaya ◽  
José Ramón Galán Mascarós ◽  
Lapo Bogani ◽  
Frank Hennrich ◽  
Manfred Kappes ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Rare Earth ◽  
Single Molecule ◽  
Single Walled Carbon Nanotubes ◽  
Single Molecule Magnets ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Carburization of Fe/Ni Catalyst for Efficient Growth of Single‐Walled Carbon Nanotubes

Small ◽  
2019 ◽  
Vol 15 (35) ◽  
pp. 1902240 ◽  
Author(s):  
Dewu Lin ◽  
Shuchen Zhang ◽  
Weiming Liu ◽  
Yue Yu ◽  
Jin Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Ni Catalyst ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

scholarly journals Synthesis of single-walled carbon nanotube networks using monodisperse metallic nanocatalysts encapsulated in reverse micelles

2016 ◽  
Vol 70 (1) ◽  
pp. 1-8
Author(s):  
Igor Gayduchenko ◽  
Georgy Fedorov ◽  
Ramil Ibragimov ◽  
Tatiana Stepanova ◽  
Arsen Gazaliev ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Silicon Dioxide ◽  
Reverse Micelles ◽  
Single Walled Carbon Nanotubes ◽  
Diameter Distribution ◽  
Ni Catalyst ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

We report on a method of synthesis of single-walled carbon nanotubes percolated networks on silicon dioxide substrates using monodisperse Co and Ni catalyst. The catalytic nanoparticles were obtained by modified method of reverse micelles of bis-(2-ethylhexyl) sulfosuccinate sodium in isooctane solution that provides the nanoparticle size control in range of 1 to 5 nm. The metallic nanoparticles of Ni and Co were characterized using transmission electron microscopy (TEM) and atomic-force microscopy (AFM). Carbon nanotubes were synthesized by chemical vapor deposition of CH4/H2 composition at temperature 1000 ?? on catalysts pre-deposited on silicon dioxide substrate. Before temperature treatment during the carbon nanotube synthesis most of the catalyst material agglomerates due to magnetic forces while during the nanotube growth disintegrates into the separate nanoparticles with narrow diameter distribution. The formed nanotube networks were characterized using AFM, scanning electron microscopy (SEM) and Raman spectroscopy. We find that the nanotubes are mainly single-walled carbon nanotubes with high structural perfection up to 200 ?m long with diameters from 1.3 to 1.7 nm consistent with catalyst nanoparticles diameter distribution and independent of its material.

Purity Evaluation of Single-Walled Carbon Nanotubes Using Thermogravimetric Analysis

2013 ◽  
Vol 51 (2) ◽  
pp. 137-144
Author(s):  
Naesung Lee ◽  
Jeung Choon Goak ◽  
Tae Yang Kim ◽  
Jongwan Jung ◽  
Young-Soo Seo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermogravimetric Analysis ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Purity Evaluation ◽  
Walled Carbon Nanotubes
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