Characterization of multi-walled carbon nanotubes (MWNTs) synthesized by CCVD using zeolite template from acetylene

High purity, multi-walled carbon nanotubes (MWNTs) were synthesized by catalytic chemical vapor deposition (CCVD) using acetylene as the carbon source based on a zeolite NaX template loaded with different iron contents. Well shaped zeolite NaX nanocrystals (FAU) of 50 nm were synthesized by a hydrot...

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Bibliographic Details
Published in:Journal of the Ceramic Society of Japan 2010/11/01, Vol.118(1383), pp.983-988
Main Authors: ZHAO, Wei, SEO, Dong Nam, KIM, Hyung Tae, KIM, Ik Jin
Format: Article
Language:English
Subjects:
Acetylene
Catalysis
Catalyst
Catalysts
Chemical vapor deposition
Iron
Multi wall carbon nanotubes
Multi-walled carbon nanotubes
Nanocrystals
Template
Zeolite
Zeolites
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Summary:High purity, multi-walled carbon nanotubes (MWNTs) were synthesized by catalytic chemical vapor deposition (CCVD) using acetylene as the carbon source based on a zeolite NaX template loaded with different iron contents. Well shaped zeolite NaX nanocrystals (FAU) of 50 nm were synthesized by a hydrothermal method according to a well designed composition of 3.5Na2O:Al2O3:2.1SiO2:1000H2O. The ion-exchange method was used for supporting different Fe2+ contents in the zeolite NaX nanocrystals to provide effective catalysts for carbon nanotube (CNT) formation. Thermal treatment of Fe2+-exchanged zeolite NaX nanocrystals resulted in the formation of α-Fe2O3 phase at 450°C in air. Transmission electron microscopy (TEM) images showed that the inner and outer tube diameters of the MWNTs were in the range of 3.8–5.0 nm and 6.3–8.8 nm, respectively, which were smaller than those of conventional thick MWNTs. The yield of the MWNTs was increased up to 47.1% with increasing iron content in pores of the zeolite crystals, which allowed the pores to be defined as containers for catalysts and as a guide template for MWNT growth.
ISSN:1882-0743
1348-6535
DOI:10.2109/jcersj2.118.983