Synthesis of Carbon Nanofibers on C-Fiber Textiles by Thermal CVD Using Fe Catalyst

Lee, Sang Won; Mees, Karina; Park, Ho Seon; Willert‐Porada, Monika; Lee, Chang Seop

doi:10.4028/www.scientific.net/amr.750-752.280

Cited by 6 publications

(19 citation statements)

References 14 publications

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“…Chemical Vapor Deposition -Recent Advances and Applications in Optical, Solar Cells and Solid State Devices was predeposited onto the C-fiber textiles and Ni was subsequently deposited onto the same C-fiber textile in a nickel(II) acetate tetrahydrate aqueous solution (Ni/Cu) [11,14,16,22,23].…”

Section: Deposition Of Catalystsmentioning

confidence: 99%

Preparation and Characterization of Carbon Nanofibers and its Composites by Chemical Vapor Deposition

Lee¹,

Hyun²

2016

Chemical Vapor Deposition - Recent Advances and Applications in Optical, Solar Cells and Solid State Devices

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Hydrocarbon gas or carbon monoxide was pyrolyzed by chemical vapor deposition (CVD), and carbon nanofiber (CNF) synthesis was performed using transition metals such as Ni, Fe, and Co as catalysts. When synthesizing carbon nanofibers using the CVD method, experimental variables are temperature, catalysts, source gas, etc. Especially, the particle size of the catalyst is the most important factor in determining the diameter of carbon nanofibers. Hydrocarbon gases, such as CH 4 , C 2 H 4 , benzene, and toluene are used as the carbon source, and in addition to these reaction gases, nonreactive gases such as H 2 , Ar, and N 2 gases are used for transportation. Synthesis occurs at a synthesis temperature of 600-900°C, and catalyst metals such as Ni, Co, and Fe are definitely required when synthesizing CNFs. Therefore, it is possible to synthesize CNFs in selective areas through selective deposition of such catalyst metals. In this study, CNFs were synthesized by CVD. Ethylene gas was employed as the carbon source for synthesis of CNFs with H 2 as the promoting gas and N 2 as the balancing gas. Synthesized CNFs can be used in various applications, such as composite materials, electromagnetic wave shielding materials, ultrathin display devices, carbon semiconductors, and anode materials of Li secondary batteries. In particular, there is an increasing demand for lightweight , small-scale, and high-capacity batteries for portable electronic devices, such as notebook computers or smartphones along with the recent issue of fossil energy depletion. Accordingly, CNFs and their silicon-series composites are receiving attention for use as anode materials for lithium secondary batteries that are eco-friendly, light weight, and high capacity.

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Section: Deposition Of Catalystsmentioning

confidence: 99%

Preparation and Characterization of Carbon Nanofibers and its Composites by Chemical Vapor Deposition

Lee¹,

Hyun²

2016

Chemical Vapor Deposition - Recent Advances and Applications in Optical, Solar Cells and Solid State Devices

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“…C-fiber textiles (SGL Carbon Group) were put into 60% nitric acid and heated at 80°C for 30 min under reflux to form OH groups on the surface of C-fiber textiles. After the completion of oxidation, the oxidized C-fiber textiles were cleaned and stored in distilled water, without drying in an oven, in order to keep the OH groups attached to the surface [4,7,17].…”

Section: Oxidationmentioning

confidence: 99%

“…For comparison, deposition of ferrous particles on the oxidized C-fiber textiles was carried out, by dipping the substrate into the solution, after the hydrolysis by urea was complete. The specimen was cleaned by distilled water, after completion of the deposition process, and dried for 24 hours at 80°C [4,7,17].…”

Section: Deposition Of Fe Catalystmentioning

confidence: 99%

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Synthesis and Characteristics of Carbon Nanofibers/Silicon Composites and Application to Anode Materials of Li Secondary Batteries

Lee¹,

Hyun²

2016

Nanofiber Research - Reaching New Heights

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Among the various synthesizing technologies of carbon nanofibers (CNFs), chemical vapor deposition (CVD) technology, which uses hydrocarbon gas or carbon monoxide as a carbon source gas and pyrolyzes it to grow CNFs on transition metal catalysts, such as Ni, Fe, and Co, has been regarded as the most inexpensive and convenient method to produce CNFs for industrial use. Experimental variables for CVD are source gas, catalyst layers, temperature, and reaction time. Since the particle size of metal catalysts has an influence on the diameter of CNFs, it is possible to control the diameter of CNFs by varying particle sizes of the metal. As such, it is possible to synthesize CNFs selectively through the selective deposition of catalyst metals. In this study, CNFs were grown by CVD on C-fiber textiles, which had catalysts deposited via electrophoretic deposition. The CNFs were coated with a silica layer via hydrolysis of TEOS (tetraethyl orthosilicate), and the CNFs were oxidized by nitric acid. Due to oxidation, a hydroxyl group was created on the CNFs, which was then able to be used as an activation site for the SiO 2. CNFs and the CNFs/SiO 2 composite can be used in various applications, such as a composite material, electromagnetic wave shielding material, ultrathin display devices, carbon semiconductors, and anode materials of Li secondary batteries. In particular, there is an increasing demand for lightweight, small-scale, and high-capacity batteries for portable electronic devices, such as laptop computers or smart phones, along with the escalating concern of fossil energy depletion. Accordingly, CNFs and CNFs/SiO 2 composites are receiving attention for their use as anode materials of Li secondary batteries, which are eco-friendly, lightweight, and high capacity. Therefore, the physicochemical properties and electrochemical performance data of synthesized CNFs and CNFs/SiO 2 composite are described in this chapter.

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“…In general, composite materials are referred to as materials showing more effective functions via the combination of two or more materials to form physically different phases. Among them, composite materials prepared by a mixture of different electrode materials and CNF have been used as more stable and effective nanomaterials with the rapid development of the communication industry, including the electronic industry, telecommunication, and information communication …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Vapor‐grown Si/CNF and Si/PC/CNF Composites Based on Co–Cu Catalysts

Park

Choi

Lee

2015

Bulletin Korean Chem Soc

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We report a study on the synthesis and structural characteristics of Si/carbon nanofiber (CNF) and Si/PC/CNF composites. CNFs were synthesized by the chemical vapor deposition using Co and Cu catalysts at a Co:Cu ratio of 6:4. This study focused on the fabrication processes of Si/PC/CNF composites to confirm the contact of Si particles with CNFs. The CNF composites on Si particles were prepared on the basis of the following two processes—Sample 1: CNFs were grown on a simple mechanical mixture of Si particles and catalysts; and Sample 2: CNFs were grown on the surface of pyrolytic carbon‐coated Si particles. The morphology and composition of the Si/CNF composites were analyzed by scanning electron microscope and energy dispersive spectroscopy measurements. Physical properties were investigated using X‐ray diffraction, Raman, X‐ray photoelectron spectroscopy, and thermogravimetric analysis, and the specific surface area was measured by Brunauer, Emmett and Teller. Consequently, pyrolytic carbon coating on the surface of Si particles showed the ability to increase the contact of CNFs to the silicon particles. The resulting pyrolytic carbon‐coated Si/CNF (Si/PC/CNF) composite also demonstrated better crystallizability compared with the Si/CNF composite prepared through the first method.

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Synthesis of Carbon Nanofibers on C-Fiber Textiles by Thermal CVD Using Fe Catalyst

Cited by 6 publications

References 14 publications

Preparation and Characterization of Carbon Nanofibers and its Composites by Chemical Vapor Deposition

Preparation and Characterization of Carbon Nanofibers and its Composites by Chemical Vapor Deposition

Synthesis and Characteristics of Carbon Nanofibers/Silicon Composites and Application to Anode Materials of Li Secondary Batteries

Synthesis and Characterization of Vapor‐grown Si/CNF and Si/PC/CNF Composites Based on Co–Cu Catalysts

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