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PRECURSOR TO HIGH PURITY CARBON NANOTUBES: A STEP BY STEP EVALUATION OF CARBON YIELD

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Title PRECURSOR TO HIGH PURITY CARBON NANOTUBES: A STEP BY STEP EVALUATION OF CARBON YIELD
 
Creator PATIL, KN
SOLANKI, CS
 
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
 
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).
 
Publisher TRANS TECH PUBLICATIONS LTD
 
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
 
Type Article
 
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
 
Language en