Chemical catalytic vapor deposition (CCVD) synthesis of carbon nanotubes by decomposition of ethylene on metal (Ni, Co, Fe) nanoparticles

Khavrus, Vyacheslav O.; Lemesh, N. V.; Gordijchuk, Svitlana V.; Tripolsky, A. I.; Ivashchenko, T. S.; Biliy, M.M.; Strizhak, P. E.

doi:10.1007/s11144-008-5225-6

Cited by 15 publications

(10 citation statements)

References 16 publications

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“…Further increasing of ethylene flow caused a slight decrease of carbon yield up to 3 gC/gFe. Similar results were presented by Khavrus et al 15 who synthesized carbon nanotubes using Ni catalyst and ethylene. Yield of MWNTs had a tendency to increase with decreasing ethylene concentrations.…”

Section: Discussion and Resultssupporting

confidence: 88%

Preparation of carbon nanotubes using cvd CVD method

Pełech

2010

Polish Journal of Chemical Technology

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In this work preparation and characteristic of modified nanocarbons is described. These materials were obtained using nanocrystalline iron as a catalyst and ethylene as a carbon source at 700°C. The influence of argon or hydrogen addition to reaction mixture was investigated. After ethylene decomposition samples were hydrogenated at 500°C. As a results iron carbide (Fe 3 C) in the carbon matrix in the form of multi walled carbon nanotubes was obtained. After a treatment under hydrogen atmosphere iron carbide decomposed to iron and carbon and small iron particles agglomerated into larger ones.

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Section: Discussion and Resultssupporting

confidence: 88%

Preparation of carbon nanotubes using cvd CVD method

Pełech

2010

Polish Journal of Chemical Technology

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“…Hydrocarbon decomposition is carried out on transition metal catalysts: iron, cobalt, and nickel, most often on a support. The available papers concern mainly the influence of experimental conditions: kind of metal [1], catalyst support [2], flow rate and hydrocarbon concentration [3] or temperature and hydrogen role [4] on carbon yield and morphology of carbon nanostructures. There are only very few papers concerning the kinetics of the process.…”

Section: Introductionmentioning

confidence: 99%

The Kinetics of Ethylene Decomposition on Iron Catalyst

Pełech

Narkiewicz

2009

Acta Phys. Pol. A

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The effect of ethylene partial pressure and temperature on the hydrocarbon decomposition rate was studied. As a catalyst, a triply promoted iron catalyst (with addition of small amounts of potassium, calcium and alumina oxides) was used. The mean crystallites size was ca. 17 nm. The processes were performed using pure ethylene or ethylene-nitrogen mixture under atmospheric pressure at the temperature range from 400 to 460 • C. The growth of carbon mass as a function of reaction time was measured using a thermobalance. The phase composition of the samples after ethylene decomposition was determined using X-ray diffraction technique. The reaction rate was independent of ethylene partial pressure in the range from 0.25 to 1 bar. The maximal carbon yield for given experimental conditions was estimated.

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“…In order to prepare the hybrid nanocomposites we used carbon nanotubes (CNT) and nitrogen-containing carbon nanotubes (N-CNT) synthesized according to [9]. The CNTs and N-CNTs were purified from catalyst residues by treatment with a mixture of concentrated acids (HF, HCl, and HNO 3 ) at 60°C for 3 h [10].…”

Section: Methodsmentioning

confidence: 99%

Effect of Carbon Nanotube Functionalization on the Structure and Electrochemical Characteristics of Their Hybrid Nanocomposites with Polyaniline and Polypyrrole

et al. 2014

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Hybrid nanocomposites were prepared on the basis of polyaniline (PAn) and polypyrrole (PPy) with functionalized multiwall carbon nanotubes (CNTs). It was shown that the method of functionalization of the CNT and the nature of the polymer have a substantial effect on the structure and electrochemical characteristics of the synthesized nanocomposites. It was established that the conductivity and the capacity characteristics of the PPy/CNT nanocomposites are determined largely by the content of carbon nanotubes, whereas for the PAn/CNT materials they are also determined by the method of functionalization of the CNT. It was shown that the highest capacity (366 and 294 F/g) is characteristic of the nanocomposites based on PAn and CNT (N-CNT) functionalized with the surface catalyst Aliquat 336.In recent years electrically conducting polymers (ECPs) have attracted considerable interest as electrode materials for the creation of various energy-converting devices and supercapacitors in particular thanks to their inherent conductivity and their ability to undergo reversible redox transitions [1,2]. At the same time the main drawback of supercapacitors based on ECPs is their relatively low stability during repeated charge/discharge cycles since they can lose their conductivity as a result of volume changes that occur during cycling [3]. On the other hand, the electrochemical activity of the ECP is limited to a specific range of potentials, and this can give rise to their degradation during over-oxidation.Along with ECPs promising materials for the creation of a new generation of supercapacitors are carbon nanotubes (CNTs), which have a fairly large surface area, relatively high conductivity, and excellent mechanical characteristics [4]. Compared with ECPs, however, they have appreciably lower specific capacity [4,5]. In view of this the creation of new composite nanomaterials based on ECPs and CNTs for the electrodes of supercapacitors that would combine the best characteristics of both components may prove extremely attractive [1,3,6].On account of their insolubility simple mechanical mixing of the CNT and ECP does not give the desired results since the CNTs are not uniformly dispersed in the polymeric matrix (also because the initial CNTs are present in the form of bundles) 204

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Chemical catalytic vapor deposition (CCVD) synthesis of carbon nanotubes by decomposition of ethylene on metal (Ni, Co, Fe) nanoparticles

Abstract: A simple method for producing unsupported nickel catalyst that can be used to synthesize multi-wall carbon nanotubes (MWNT) has been developed. The yield of purified MWNTs is about 1.8 g MWNT /(g cat ×h).

Cited by 15 publications

References 16 publications

Preparation of carbon nanotubes using cvd CVD method

Preparation of carbon nanotubes using cvd CVD method

The Kinetics of Ethylene Decomposition on Iron Catalyst

Effect of Carbon Nanotube Functionalization on the Structure and Electrochemical Characteristics of Their Hybrid Nanocomposites with Polyaniline and Polypyrrole

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