Growth mechanism of vapor phase CVD-grown multi-walled carbon nanotubes

Ferromagnetic-filled carbon nanotubes are new nanostructured materials with many possible applications. They can be synthesized using the thermal decomposition of metallocenes of the iron triad. Two different methods (solid and liquid source CVD) are suitable for producing, at very high filling rates, filled nanotubes on precoated Si substrates. The diameters of deposited filled nanotubes are particularly dependent on the size of catalyst particles on the substrate, while the lengths depend more on the sublimation and decomposition rate of metallocene. The growth mechanism of filled carbon nanotubes is based on the root growth mode. Multiwalled carbon nanotubes, filled with body-centered cubic Fe, show unusual magnetic properties. Aligned-growth nanotube ensembles can reach coercivities up to 130 mT (bulk iron 0.09 mT). Ferromagnetic-filled carbon nanotubes can be successfully used both as cantilever tips in magnetic force microscopy and as a nanocontainer for new therapies in medicine.

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“…This model is schematically shown in Figure 7. Recently, Deck and Vecchio [29] reported a similar growth mechanism.…”

Section: Growth Mechanism Of Filled Carbon Nanotubesmentioning

confidence: 76%

Synthesis, Properties, and Applications of Ferromagnetic‐Filled Carbon Nanotubes

Leonhardt

Hampel

Müller

et al. 2006

Chemical Vapor Deposition

140

113

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“…5b), indicative of its higher catalytic activity. Cobalt has also been utilized as a catalyst for CNT growth [25]. However, the Co underlayer gave heterogeneous CNT films in this study.…”

Section: Discussionmentioning

confidence: 95%

“…The growth model proposed by Deck et al [25] is applicable to this Fe@CNT growth. This model postulates the formation of metal nanoparticles acting as growth sites on the substrate, catalyzing this CNT growth.…”

Section: Discussionmentioning

confidence: 99%

Influence of Underlayer on Growth of Carbon Nanotubes Filled with Iron Nanowires

Kubonaka

Sato

Fujiwara

2015

e-J. Surf. Sci. Nanotech.

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Carbon nanotubes filled with iron nanowires (Fe@CNTs) show magnetic anisotropy because of the high aspect ratio of the nanowires and are expected to find numerous applications such as magnetic recording media, probes for scanning force microscopy and medical treatment for cancer (hyperthermia). These applications require precise control of Fe@CNT growth. This growth depends on the condition of the substrate surface on which the CNTs are grown. In this study, Fe@CNTs were synthesized by thermal chemical vapor deposition on various thin metal films (Fe, Ni, Co, Al, Pt, Ti, or Mo) deposited on SiO2/Si(100) substrates using ferrocene as a precursor, and their growth characteristics were investigated. The growth clearly depends on the metal species incorporated in the thin films. Magnetic properties correlated with growth morphologies. Therefore, the appropriate selection of an underlayer is important for controlling magnetic characteristics of Fe@CNTs.

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“…This model is an adaptation of the model suggested by Baker [39] to explain the carbon filaments growth. Currently this is the most plausible model of nanotubes growth obtained in CVD method [40][41][42]. In this model three stages can be distinguished during the nanotube growth: nucleation - Fig.…”

Section: Discussionmentioning

confidence: 99%

Characterisation of Ni-C films obtained in PVD/CVD process

Kęczkowska

2011

Open Physics

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Abstract:The work presents the results of the scanning electron microscopy (SEM) and Raman spectrometry studies of carbonaceous nanostructures containing nickel nanocrystallites. The films were obtained using a twostep method. In the first phase the Physical Vapour Deposition (PVD) method was applied, whereas in the second Chemical Vapour Deposition (CVD) method was used. The paper presents results for samples with various Ni content obtained with different parameters of the two-phase technological process. The research confirms that the thin films obtained by PVD method contain Ni nanocrystallites distributed in a carbonaceous matrix. The matrix is composed of various carbon allotropes (amorphous carbon, graphite, fullerene). The thin films made by CVD method make a matrix when multiwalled, carbonaceous nanotubes are obtained. Depending on the technological process parameters of each phase, we obtain multiwall nanotubes with a various degree of defects. PACS (

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Growth mechanism of vapor phase CVD-grown multi-walled carbon nanotubes

Cited by 105 publications

References 32 publications

Synthesis, Properties, and Applications of Ferromagnetic‐Filled Carbon Nanotubes

Synthesis, Properties, and Applications of Ferromagnetic‐Filled Carbon Nanotubes

Influence of Underlayer on Growth of Carbon Nanotubes Filled with Iron Nanowires

Characterisation of Ni-C films obtained in PVD/CVD process

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