scholarly journals Growth of Vertically Aligned Carbon Nanotubes on Silicon Using a Sparked Iron-Cobalt Catalyst

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Sirikamon Saengmee-anupharb ◽  
Sanitta Thongpang ◽  
Erwin S. P. Bertheir ◽  
Pisith Singjai
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Water Vapor ◽  
Chemical Vapor ◽  
Band Ratio ◽  
Vertically Aligned Carbon Nanotubes ◽  
Transmission Electron ◽  
Aligned Carbon Nanotubes ◽  
Pressure Chemical ◽  
Vertically Aligned

Vertically aligned carbon nanotubes (VA-CNTs) were successfully grown on silicon substrates by atmospheric pressure chemical vapor deposition at 750∘C using acetylene as a carbon source and Fe-Co nanoparticle thin films as a cocatalyst. Preparation of the cocatalyst was operated by an economical sparking process. A small amount of water vapor was introduced into the reactor by controlling diffusion by heated water in a flask. The CNTs were characterized by scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The VA-CNTs were obtained only when the water vapor fraction in the introduced gas was in the range of 310–440 ppm. The length of the VA-CNTs reached 0.8 mm with a growth rate of 17 μm/min. Moreover, D/G-band ratio suggests that the optimum fraction of water vapor decreases defects in CNTs.

Performance of Vertically Aligned MWCNTs/Ni/Ti/Au/Si Electrode for Supercapacitors by CVD

2013 ◽  
Vol 813 ◽  
pp. 336-339
Author(s):  
Tung Feng Hsieh ◽  
Mei Li You
Keyword(s):  
Electron Microscopy ◽  
Vapor Deposition ◽  
Composite Electrode ◽  
Chemical Vapor ◽  
Si Substrate ◽  
Vertically Aligned Carbon Nanotubes ◽  
Surface Areas ◽  
Transmission Electron ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned

Using chemical vapor deposition in this study to grow vertically aligned carbon nanotubes on Ni/Ti/Au/Si as electrodes for supercapacitor is simpler and reproducible than other methods. Nanoparticles on Ni/Ti/Au/Si substrate proceeded by e-beam evaporation were less than 15 nm, vertically aligned MWCNT are distributed uniformly on the substrate, and the number of nanotubes per square centimeter is 6.3×1010. Morphologies and structures of the composite electrode were examined by scanning electron microscopy, transmission electron microscopy and Raman spectrum. This straightforward process can fabricate high specific surface areas of other nanoparticles on the MWCNTs.

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