PRECURSOR TO HIGH PURITY CARBON NANOTUBES: A STEP BY STEP EVALUATION OF CARBON YIELD
DSpace at IIT Bombay
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Title |
PRECURSOR TO HIGH PURITY CARBON NANOTUBES: A STEP BY STEP EVALUATION OF CARBON YIELD
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Creator |
PATIL, KN
SOLANKI, CS |
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Subject |
chemical-vapor-deposition
large-scale production fluidized-bed reactor catalytic decomposition cvd synthesis growth temperature deactivation purification parameters carbon nanotubes chemical vapor deposition carbon yield three stage purification |
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Description |
Yield of carbon nanotubes (CNTs) depends on numerous process parameters such as temperature of synthesis, type of catalyst, type of precursor, time of precursor flow and partial pressure of precursor gas as well as carrier gas, etc. Experiments were performed in order to find the optimum temperature of synthesis for varying time of precursor flow. The yield was evaluated in terms of mass of crystalline CNTs per gram of substrate and/or catalyst. The CNTs were grown on a calcium carbonate (CaCO(3)) substrate, with iron-cobalt (Fe-Co) as a catalyst, using acetylene (C(2)H(2)) as a precursor gas and argon (Ar) as a carrier gas. A three-stage purification process, incorporating two acid treatment steps and one annealing step, was used for purification which ensures high grade purity of CNTs. The highest yield of 21.4 g of CNTs per g of catalyst was achieved at 700 degrees C for 60 min of synthesis. The CNTs were characterized by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), Raman, Thermo-gravimetric analysis (TGA), and Gas chromatography (GC).
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Publisher |
TRANS TECH PUBLICATIONS LTD
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Date |
2011-09-01T07:38:20Z
2011-12-26T12:59:32Z 2011-12-27T05:51:50Z 2011-09-01T07:38:20Z 2011-12-26T12:59:32Z 2011-12-27T05:51:50Z 2009 |
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Type |
Article
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Identifier |
JOURNAL OF NANO RESEARCH, 6(), 75-87
1662-5250 http://dspace.library.iitb.ac.in/xmlui/handle/10054/12708 http://hdl.handle.net/10054/12708 |
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Language |
en
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