MWCNT coatings obtained by thermal CVD using ethanol decomposition

Wienecke, M.; Bunescu, Mihaela-C.; Deistung, Klaus; Fedtke, Petra; Borchartd, Erika

doi:10.1016/j.carbon.2005.09.020

Cited by 22 publications

(11 citation statements)

References 27 publications

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“…They are routinely synthesized using thermal chemical vapor deposition (CVD) techniques due to higher yields and lower production costs. [11][12][13] For the reaction, an inert carrier gas, for example argon, is used to transport a vaporized carbon source and a growth-promoter ("catalyst") into a reaction chamber at elevated temperatures. [14][15][16] Typical carbon sources include xylene, 16,17 acetonitrile, 18,19 methane, 20,21 and ethene.…”

Section: Introductionmentioning

confidence: 99%

Multi-Walled Carbon Nanotubes Grown from Chemical Vapor: Links between Atomic near Range Order and Growth Parameters

et al. 2009

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Extended X-ray absorption fine structure (EXAFS) spectroscopy was used to investigate the atomic nearrange structure of iron in multiwalled carbon nanotubes. The nanotubes were grown from xylene and ferrocene using chemical vapor deposition (CVD) via a large-scale (16 L) reactor. Principal component analysis (PCA) was employed to classify spectra according to their similarities, and full EXAFS analyses were used to investigate the iron structure based on models derived from metallic R-Fe and iron-carbide. Relationships between critical nanotube growth parameters (temperature, CVD feedstock mass, ferrocene mass), macroscopic product properties (Fe content and production yield), and structural parameters from the EXAFS analyses are discussed. The temperature is found to be directly linked to the structure of the Fe-carbides and metallic Fe present inside the nanotubes. Ferrocene and feedstock masses do not affect the structure of iron-carbides, and the content of Fe-carbides is found to be higher than in the case of the nanotubes containing R-Fe. This situation is reversed for the overall production yield of nanotubes. The results of this study also demonstrate how EXAFS and PCA can be applied to obtain critical structural information from larger numbers of samples in order to facilitate optimization of nanotube production processes.

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Section: Introductionmentioning

confidence: 99%

Multi-Walled Carbon Nanotubes Grown from Chemical Vapor: Links between Atomic near Range Order and Growth Parameters

et al. 2009

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“…Due to the lower temperature and power requirements of CVD, it is a scalable synthesis technique for MWCNTs. Synthesizing nanotubes via thermal CVD in oxidizing conditions, such as in air, was found to yield nanotubes free of amorphous carbon [20]. Other process parameters, such as the catalytic growth rate and secondary pyrolysis rates, also govern the structure and quality of nanotubes.…”

Section: Chemical Vapor Depositionmentioning

confidence: 99%

Fabrication and Supercapacitor Applications of Multiwall Carbon Nanotube Thin Films

Jiang

Gerhardt

2021

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Multiwalled carbon nanotubes (MWCNTs) are a one-dimensional nanomaterial with several desirable material properties, including high mechanical tensile modulus and strength, high electrical conductivity, and good thermal conductivity. A wide variety of techniques have been optimized to synthesize MWCNTs and to fabricate thin films of MWCNTs. These synthesis and fabrication methods vary based on precursor materials, process parameters, and physical and chemical principals, and have a strong influence on the properties of the nanotubes and films. Thus, the fabrication methods determine the performance of devices that can exploit the advantageous material properties of MWCNTs. Techniques for the fabrication of carbon nanotubes and carbon nanotube thin films are reviewed, followed by a discussion of the use of MWCNTs as an electrode material for electrochemical double-layer supercapacitors (EDLCs). EDLCs feature high power density, excellent reversibility and lifetime, and improved energy density over electrolytic capacitors. Beyond surveying fabrication techniques previously explored for MWCNT electrodes, an alternative approach based on inkjet printing capable of depositing a small amount of active material is discussed. Such an approach allows for a high degree of control over electrode properties and can potentially reduce cost and active material waste, which are essential components to the gradual conversion to green energy.

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“…Unlike the conventional CVD CNTs, the DP-HFCVD CNTs appeared highly dense and were grown perpendicular to the substrate. It is reported that the growth rate in plasma enhanced (PE)CVD is generally slower than that in thermal CVD, which may be partly due to the atmospheric pressure operation of thermal CVD [114]. The CNTs grown by DP-HFCVD system also showed a slow growth rate and, taking almost 2 hours to form a forest of tubes.…”

Section: Fabrication Of Vertically Aligned Carbon Nanotubesmentioning

confidence: 99%

Carbon Nanotube Based Magnetic Tunnel Junctions (MTJs) for Spintronics Application

Titus¹,

Krishna²,

Grácio³

et al. 2011

Electronic Properties of Carbon Nanotubes

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MWCNT coatings obtained by thermal CVD using ethanol decomposition

Cited by 22 publications

References 27 publications

Multi-Walled Carbon Nanotubes Grown from Chemical Vapor: Links between Atomic near Range Order and Growth Parameters

Multi-Walled Carbon Nanotubes Grown from Chemical Vapor: Links between Atomic near Range Order and Growth Parameters

Fabrication and Supercapacitor Applications of Multiwall Carbon Nanotube Thin Films

Carbon Nanotube Based Magnetic Tunnel Junctions (MTJs) for Spintronics Application

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