Visible diffraction from quasi-crystalline arrays of carbon nanotubes

Nanoscale ◽  
2015 ◽  
Vol 7 (32) ◽  
pp. 13452-13457 ◽  
Author(s):  
Timothy P. Butler ◽  
Haider Butt ◽  
Timothy D. Wilkinson ◽  
Gehan A. J. Amaratunga
Keyword(s):  
Carbon Nanotubes ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Ni Catalyst ◽  
Large Area ◽  
Vertically Aligned Carbon Nanotubes ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned ◽  
Definition Of ◽  
Nanotube Growth

Large area arrays of vertically-aligned carbon nanotubes (VACNTs) are patterned in a quasi-crystalline Penrose tile arrangement through electron beam lithography definition of Ni catalyst dots and subsequent nanotube growth by plasma-enhanced chemical vapour deposition.

Selective Growth of Vertically Aligned Carbon Nanotubes by Double Plasma Chemical Vapour Deposition Technique

2008 ◽  
Vol 8 (8) ◽  
pp. 4029-4032 ◽  
Author(s):  
Gil Cabral ◽  
Elby Titus ◽  
D. S. Misra ◽  
J. Gracio
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Selective Growth ◽  
Vertically Aligned Carbon Nanotubes ◽  
Glow Discharges ◽  
Aligned Carbon Nanotubes ◽  
Chemical Vapour Deposition Technique ◽  
Vertically Aligned

The selective growth of vertically aligned carbon nanotubes (VACNTs) on large area copper substrates was carried out using a double plasma hot-filament chemical vapour deposition system. Three independent power supplies were used to produce two glow discharges within the vacuum reactor. The generation of two glow discharges and the efficient utilization of the electric fields, by controlling the key process parameters, enabled the production of VACNTs. Morphology, density and structure of carbon nanotubes were characterized using Scanning Electron Microscopy and Raman Spectroscopy.

Effect of Temperature on the Growth of Vertically Aligned Carbon Nanotubes from Palm Oil

2011 ◽  
Vol 312-315 ◽  
pp. 900-905 ◽  
Author(s):  
Abu Bakar Suriani ◽  
Salina Muhamad ◽  
Puteri Sarah Mohamad Saad ◽  
Roslan Md Nor ◽  
Yosri Mohd Siran ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Palm Oil ◽  
Chemical Vapour ◽  
Catalytic Decomposition ◽  
Synthesis Temperature ◽  
Effect Of Temperature ◽  
Vertically Aligned Carbon Nanotubes ◽  
Temperature Range ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned

The effects of synthesis temperature on the quality and quantity of vertically aligned carbon nanotubes (VACNT) were studied using high resolution scanning electron microscopy, and micro-Raman spectroscopy. The VACNT was synthesized by Fe catalytic decomposition of palm oil deposited on silicon substrate by thermal chemical vapour deposition method. The analysis shows that the growth rate increases from 3.8 to 5.5 µm/min as the temperature was increased from 750 to 800°C. The nanotube diameters were observed bigger at low temperature range. Smaller and uniform diameter (~15 nm) was found at 750°C and the increment in diameter size was seen at higher temperature range. Smaller graphite Raman “G” peak width, low ID/IG ratio (~0.52) indicated higher crystallinity of the nanotube and moderate I2D1/ I2D2 ratio for second order Raman peak was also detected at synthesis temperature of 750°C. These results indicated that the optimum synthesis temperature for higher quality VACNT production was at 750°C.

Electron Emission of Vertically Aligned Carbon Nanotubes Grown on a Large Area Silicon Substrate by Thermal Chemical Vapor Deposition

2000 ◽  
Vol 621 ◽  
Author(s):  
Cheol J. Lee ◽  
Jung H. Park ◽  
Kwon H. Son ◽  
Dae W. Kim ◽  
Tae J. Lee ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Large Area ◽  
Carbonaceous Particles ◽  
Vertically Aligned Carbon Nanotubes ◽  
Thermal Chemical Vapor Deposition ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned

ABSTRACTWe have grown vertically aligned carbon nanotubes on a large area of Co-Ni codeposited Si substrates by thermal chemical vapor deposition using C2H2 gas. The carbon nanotubes grown by the thermal chemical vapor deposition are multi-wall structure, and the wall surface of nanotubes is covered with defective graphite sheets or carbonaceous particles. The carbon nanotubes range from 50 to 120 nm in diameter and about 130 μm in length at 950 °C. Steric hindrance between nanotubes at an initial stage of the growth forces nanotubes to align vertically. The turn-on voltage was about 0.8 V/μm with a current density of 0.1 μA/cm2 and emission current reveals the Fowler-Nordheim mode.

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