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The effects of carbon concentration in the precursor gas on the quality and quantity of carbon nanotubes synthesized by CVD method

Paper ID Volume ID Publish Year Pages File Format Full-Text
42287 45919 2010 6 PDF Available
Title
The effects of carbon concentration in the precursor gas on the quality and quantity of carbon nanotubes synthesized by CVD method
Abstract

High purity, aligned multi-wall carbon nanotube (CNT) films were grown on quartz substrates in a chemical vapor deposition (CVD) process. In the CVD process, a solution of ferrocene in toluene was injected in a carrier gas of Ar/H2, into a horizontal quartz tube. The CNTs were analyzed by scanning and transmission electron microscopy, thermogravimetric analysis, and Raman spectroscopy. Results for CNTs synthesized using a wide range of toluene concentrations indicated that, for carbon concentration in the gas phase higher than ∼9.6 mol/m3, catalyst deactivation due to encapsulation of metal particles occurs. Sectional analysis of the CVD reactor products showed that more than 40% of the iron particles were deposited in the first 10 cm section of the reactor, wherein diameters of nanotubes (∼28 nm) and iron particles are smaller than that of (∼48 nm) in the exit region of the reactor. The CNT diameter is closely related to the iron particle size on which they grow. In the area close to the reactor inlet, as the nanotube film grows the iron particles become trapped and attached to the dense film of nanotubes and turn into carbon-coated nanospheres on top of the nanotube array.

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Keywords
Carbon nanotubes; Carbon concentration in the gas phase; Encapsulation; Ferrocene
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The effects of carbon concentration in the precursor gas on the quality and quantity of carbon nanotubes synthesized by CVD method
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 372, Issue 2, 15 January 2010, Pages 147–152
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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