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An original growth mode of MWCNTs on alumina supported iron catalysts

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Abstract.
Multi-walled carbon nanotubes (MWCNTs) have been produced from ethylene by fluidized bed-catalytic
chemical vapor deposition (FB-CCVD) on alumina supported iron catalyst powders. Both catalysts and
MWCNTs-catalyst composites have been characterized by XRD, SEM-EDX, TEM, Mössbauer spectroscopy,
TGA and nitrogen adsorption measurements at different stages of the process. The fresh catalyst is
an alumina/iron oxide powder composed of amorphous iron(III) oxide nanoparticles located inside the
porosity of the alumina support and of a micrometric crystalline α-iron(III) oxide surface film. The
beginning of the CVD process provokes a brutal reconstruction and simultaneous carburization of the
surface film that allows MWCNT nucleation and growth. These MWCNTs grow aligned between the
support and the surface catalytic film, leading to a uniform consumption and uprising of the film.
When the catalytic film has been consumed, the catalytic particles located inside the alumina porosity
are slowly reduced and activated leading to a secondary MWCNT growth regime, which produces a
generalized grain fragmentation and entangled MWCNT growth. Based on experimental observations and
characterizations, this original two-stage growth mode is discussed and a general growth mechanism is
proposed.

Keywords:
Multi-walled carbon nanotubes
Iron catalyst
Thin film
Chemical vapor deposition
Vertically aligned carbon nanotubes

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Informasi Detail

Judul Seri

Journal of Catalysis

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Catalysis 263 (2009) 345–358

Bahasa

English

ISBN/ISSN

00219517

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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