Controlling the morphology of Vertically-aligned carbon nanotubes using Langmuir-Blodgett deposited CoFe2O4, Fe3O4, and Fe nanoparticles with palmitic acid

2016 ◽  
Vol 616 ◽  
pp. 662-672 ◽  
Author(s):  
Taiga Sato ◽  
Kentaro Nakamura ◽  
Shota Takagiwa ◽  
Masahito Kushida
Keyword(s):  
Carbon Nanotubes ◽  
Palmitic Acid ◽  
Vertically Aligned Carbon Nanotubes ◽  
Langmuir Blodgett ◽  
Aligned Carbon Nanotubes ◽  
Fe Nanoparticles ◽  
Vertically Aligned

Synthesis of Vertically-Aligned Carbon Nanotubes from Langmuir-Blodgett Films Deposited Fe Nanoparticles on Al2O3/Al/SiO2/Si Substrate

2016 ◽  
Vol 16 (4) ◽  
pp. 3289-3294 ◽  
Author(s):  
Shota Takagiwa ◽  
Osamu Kanasugi ◽  
Kentaro Nakamura ◽  
Masahito Kushida
Keyword(s):  
Carbon Nanotubes ◽  
Polymer Electrolyte Fuel Cell ◽  
Outer Diameter ◽  
Si Substrate ◽  
Thermal Aggregation ◽  
Lb Films ◽  
Vertically Aligned Carbon Nanotubes ◽  
Langmuir Blodgett ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned

In order to apply vertically-aligned carbon nanotubes (VA-CNTs) to a new Pt supporting material of polymer electrolyte fuel cell (PEFC), number density and outer diameter of CNTs must be controlled independently. So, we employed Langmuir-Blodgett (LB) technique for depositing CNT growth catalysts. A Fe nanoparticle (NP) was used as a CNT growth catalyst. In this study, we tried to thicken VA-CNT carpet height and inhibit thermal aggregation of Fe NPs by using Al2O3/Al/SiO2/Si substrate. Fe NP LB films were deposited on three typed of substrates, SiO2/Si, as-deposited Al2O3/Al/SiO2/Si and annealed Al2O3/Al/SiO2/Si at 923 K in Ar atmosphere of 16 Pa. It is known that Al2O3/Al catalyzes hydrocarbon reforming, inhibits thermal aggregation of CNT growth catalysts and reduces CNT growth catalysts. It was found that annealed Al2O3/Al/SiO2/Si exerted three effects more strongly than as-deposited Al2O3/Al/SiO2/Si. VA-CNTs were synthesized from Fe NPs-C16 LB films by thermal chemical vapor deposition (CVD) method. As a result, at the distance between two nearest CNTs 28 nm or less, VA-CNT carpet height on annealed Al2O3/Al/SiO2/Si was about twice and ten times thicker than that on SiO2/Si and that on as-deposited Al2O3/Al/SiO2/Si, respectively. Moreover, distribution of CNT outer diameter on annealed Al2O3/Al/SiO2/Si was inhibited compared to that on SiO2/Si. These results suggest that since thermal aggregation of Fe NPs is inhibited, catalyst activity increases and distribution of Fe NP size is inhibited.

Correlation and Comparison Between Thermodynamic Aspects and Cytocompatibility of Cells on Superhydrophobic and Superhydrophilic Vertically Aligned Carbon Nanotubes

2013 ◽  
Vol 3 (2) ◽  
pp. 155-165 ◽  
Author(s):  
Teresa C.O. Marsi ◽  
Marcus A.F. Corat ◽  
Mirian M. Machado ◽  
Evaldo J. Corat ◽  
Fernanda R. Marciano ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Vertically Aligned Carbon Nanotubes ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned

Efficient lithium storage from modified vertically aligned carbon nanotubes with open-ends

RSC Advances ◽  
2015 ◽  
Vol 5 (84) ◽  
pp. 68875-68880 ◽  
Author(s):  
Hyun Young Jung ◽  
Sanghyun Hong ◽  
Ami Yu ◽  
Sung Mi Jung ◽  
Sun Kyoung Jeoung ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
Lithium Ion ◽  
Lithium Storage ◽  
Vertically Aligned Carbon Nanotubes ◽  
Structure And Morphology ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned ◽  
Controlled Structure

Herein, we report the use of vertically aligned carbon nanotubes (VA-CNTs) with controlled structure and morphology as an anode material for lithium-ion batteries.

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