The Role of Sulphur in the Synthesis of Carbon Nanotubes by Chemical Vapour Deposition at High Temperatures

2008 ◽  
Vol 8 (5) ◽  
pp. 2442-2449 ◽  
Author(s):  
M. S. Motta ◽  
A. Moisala ◽  
I. A. Kinloch ◽  
A. H. Windle
Keyword(s):  
Carbon Nanotubes ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Growth Promoter ◽  
Reaction Products ◽  
High Resolution Tem ◽  
Microstructural Characterisation ◽  
Synthesis Of Carbon Nanotubes ◽  
Nanotube Growth

Sulphur has been recognised as a growth promoter for carbon fibres and carbon nanotubes for over 30 years. Moreover, the Fe-C-S system, in particular, has been extensively studied for more than half a century in the fields of steelmaking and cast iron. In the present work we examine the role of sulphur in the iron-catalysed growth of carbon nanotubes during the process of direct spinning of fibres from the gas phase. A detailed microstructural characterisation of the reaction products was conducted by high resolution TEM and EELS composition mapping on a dedicated FEG STEM (VG HB 501) equipped with Cs aberration correctors. Our results agree with previous works in classical metallurgy, indicating that sulphur forms a layer on the surface of the catalyst particles that plays a role in encouraging nanotube growth by surface diffusion.

Synthesis of carbon nanotubes by CO2-laser-assisted chemical vapour deposition

2003 ◽  
Vol 44 (1) ◽  
pp. 43-50 ◽  
Author(s):  
R Alexandrescu ◽  
A Crunteanu ◽  
R.-E Morjan ◽  
I Morjan ◽  
F Rohmund ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapour Deposition ◽  
Co2 Laser ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Synthesis Of Carbon Nanotubes

The role of the gas species on the formation of carbon nanotubes during thermal chemical vapour deposition

2008 ◽  
Vol 19 (44) ◽  
pp. 445605 ◽  
Author(s):  
Fumitaka Ohashi ◽  
Guan Yow Chen ◽  
Vlad Stolojan ◽  
S Ravi P Silva
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour

scholarly journals A study on synthesis of carbon nanotubes from liquefied petroleum gas by chemical vapour deposition

2017 ◽  
Vol 126 (1B) ◽  
pp. 135
Author(s):  
Nguyen Duc Vu Quyen
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Volume Ratio ◽  
Bet Surface Area ◽  
Synthesis Process ◽  
External Diameter ◽  
Liquefied Petroleum Gas ◽  
Synthesis Of Carbon Nanotubes

In the present paper, the synthesis of carbon nanotubes from liquefied petroleum gas by chemical vapour deposition with the catalyst of Fe/SiO<sub>2</sub> was showed. The morphology and tube diameter of carbon nanotubes depended on factors such as the flow of initial gases (H<sub>2</sub> and LPG) and growth temperature that were investigated, repectively. The obtained CNTs was characterized by XRD, EDX, SEM, TEM and BET analyses. The results indicated that the synthesis process at 700<sup>o</sup>C for 2 hours with the volume ratio of H<sub>2</sub>:LPG = 1.75:1 (140 mL.min<sup>-1</sup> of H<sub>2</sub> and 80 mL.min<sup>-1</sup> of LPG) was suitable for forming the material exhibitting nano-sized tubes. The multiwalled structure was obtained and the tubes were long and identical with external diameter of 52 nm and BET surface area of 93 m<sup>2</sup>.g<sup>-1</sup>.

Carbon Nanotubes Grown with Non-Ferromagnetic Catalysts in Alcohol CVD

2010 ◽  
Vol 636-637 ◽  
pp. 703-708 ◽  
Author(s):  
E. Borowiak-Palen ◽  
A. Steplewska ◽  
A. Bachmatiuk ◽  
M.H. Rümmeli ◽  
R.K. Kalenczuk
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Carbon Nanostructures ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Iron Catalysts ◽  
Multiwalled Carbon ◽  
Experimental Conditions ◽  
Transmission Electron ◽  
Synthesis Of Carbon Nanotubes

In this contribution we present high resolution transmission electron microscopy (HR-TEM) and Raman studies on the synthesis of carbon nanotubes using platinum supported on MgO in alcohol - chemical vapour deposition (A-CVD). For comparison copper and iron catalysts mixed with the same metal loading in MgO and the same process parameters in A-CVD have been tested. Our findings show that the choice of catalyst utilized under the same experimental conditions strongly influences the final morphology of the carbon nanostructures. Application of Pt/MgO in CVD results in doublewalled carbon nanotubes (DWCNT) and multiwalled carbon nanotubes (MWCNT). Cu/MgO mixtures lead to the synthesis of copper filled multiwalled carbon nanotubes (Cu-MWCNT) and iron capsules surrounded by multiwalled carbon shells (Fe-MWCS), respectively. Our findings indicate that the three discussed metals interact differently with the substrate leading to the formation of different sized catalyst particles. The analysis of the particles size in the catalyst precursors and in the final products is also described in this contribution.

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