Growth of Carbon Nanotubes on Surface of Carbon Fibers Rod

Lim, Yun Soo; Kim, Woo Sik; Moon, Sook Young; Han, Dong Yun; Lee, Jin Yong

doi:10.4028/www.scientific.net/KEM.317-318.259

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Synthesis and Properties of Titania Nanotube Doped with Small Amount of Cations
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High Pressure / Low Temperature Sintering of Nanostructured Titania by Internal Heating Method
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Growth of Carbon Nanotubes on Surface of Carbon Fibers Rod
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On the Dissolution of WC in WC-Co Alloys
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Conventional Sintering Route for the Production of Alumina-Based Nanocomposites: A Microstructural Characterization
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Home Key Engineering Materials The Science of Engineering Ceramics IIIGrowth of Carbon Nanotubes on Surface of Carbon...

Growth of Carbon Nanotubes on Surface of Carbon Fibers Rod

Abstract:

The growth of carbon nanotubes (CNTs) from surface of carbon fibers rods (CFRs) as used supports is under investigation using the Fe-catalytic chemical vapor deposition method. TEM studies indicate that under the experimental conditions Fe catalysts on CFRs produces mostly bundles of multiwall carbon nanotubes (MWCNTs). SEM results show the best presence of bundles of MWCNTs for Fe catalysts of 6.5 mol % at 800°C.

Info:

Periodical:

Key Engineering Materials (Volumes 317-318)

Main Theme:

The Science of Engineering Ceramics III

Edited by:

T. Ohji, T. Sekino and K. Niihara

Pages:

259-262

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.317-318.259

Citation:

Y. S. Lim et al., "Growth of Carbon Nanotubes on Surface of Carbon Fibers Rod", Key Engineering Materials, Vols. 317-318, pp. 259-262, 2006

Online since:

August 2006

Authors:

Yun Soo Lim, Woo Sik Kim, Sook Young Moon, Dong Yun Han, Jin Yong Lee

Keywords:

Carbon Fiber (CF), Carbon Nanotube (CN), Catalyst, Chemical Vapor Deposition (CVD)

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Paper TitlePages

Carbon Nanotubes Preparation Using Carbon Monoxide from the Pyrolysis Flame

Authors: Bao Min Sun, Yuan Chao Liu, Zhao Yong Ding

Abstract: Carbon nanotube is a new kind of carbon material. Synthesis of carbon nanotubes from V-type pyrolysis flame is a kind of novel technique. It needs simple laboratory equipments and normal atmosphere pressure. The V-type pyrolysis flame experimental system is introduced. Carbon source is the carbon monoxide which is carried to the middle pipe of V-type pyrolysis flame combustor. Heat source is from acetylene /air premixed flame. Pentacarbonyl iron, served as catalyst, is transported by spray- pyrolysis method into the burner. The carbon nanotubes were characterized by scanning electron microscope and transmission electron microscope. The diameter of carbon nanotubes is approximate 20nm and its length is dozens of microns. The impact of the temperature, reactant composition and catalyst was analyzed to reveal the rule of carbon nanotube growth. Carbon nanotubes with good form and less impurity can be captured when the temperature was from 800°C to 1000°C and carbon monoxide/hydrogen/helium mixed gas flow was supplied. The effective diameter of pentacarbonyl iron nanoparticles is approximate from 5nm to 20nm in the process of carbon nanotube formation. Mechanism of carbon nanotube base on the V-type pyrolysis flame method was proposed. The carbon “dissolved-proliferation-separate out” theory can be used to explain how the pentacarbonyl iron catalyses carbon monoxide to form carbon nanotubes.

104

Effects of Temperature for Carbon Nanotubes Synthesis

Authors: Zhao Yong Ding, Bao Min Sun, Yong Hong Guo, Bin Jia, Jin Sheng Bi

Abstract: Pyramid sharp pyrolysis flame is a new method for carbon nanotubes synthesis. Oxy-acetylene flame outside the frustum of pyramid sharp reactor provides the necessary high temperature circumstance for carbon nanotubes synthesis, while inside the interior mixture of CO, H2, He, and iron pentacarbonyl (Fe(CO)5) is heated. CO is used as the source of carbon, Fe(CO)5 as the source of catalyst precursor. Special structure of the frustum of pyramid sharp reactor makes the oxy-acetylene flame folded gradually above the reactor. And it meets the condition that the interior mixture which has reacted initially under high temperature and will flow out of reactor avoids exposing to air completely and burning abundantly. Immersing a sampling substrate into the incomplete burning flame can gain carbon nanotubes. By adjusting the distance between the oxy-acetylene flame jet and the synthesis area, achieved the purpose that just changing one factor of synthesis or pyrolysis temperature while the other one constant, then respectively studied the effects of them on experimental. The perfect synthesis temperature in experimental is about 595°C, while the pyrolysis temperature is about 1000°C.

572

Electron Microscopy Study of Y-Shaped Carbon Fibers with Different Morphologies

Authors: Qian Zhang, Li Feng Dong

Abstract: A series of techniques, including field emission scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, and energy dispersive X-ray spectroscopy were employed to investigate three types of Y-shaped carbon fibers that were synthesized by the thermal decomposition of acetylene using an atmospheric pressure catalytic chemical vapor deposition process and copper tartrate as a catalyst precursor. On the basis of electron microscopy analysis, we propose that the simultaneous growth of three pieces of carbon fibers on the same copper catalyst particle results in the formation of Y-shaped carbon fibers. When several copper catalyst particles became positioned in a stratified arrangement, other types of Y-shaped carbon fibers were obtained. Our study indicates that the morphology of various Y-shaped carbon fibers can be controlled by tailoring the configuration of the copper catalyst particles used to generate them.

1364

Effect of Carbon Fibers’ Surface Modification on the In Situ Growth of Carbon Nanotubes

Authors: Jian Bao Hu, Shao Ming Dong, Xiang Yu Zhang, Zhi Hui Hu, Bo Lu, Jin Shan Yang, Qing Gang Li, Bin Wu

Abstract: Surface modification of carbon fibers(CF) by physicochemical methods directs an attractive approach for improvement of metal uptake from solutions. We investigated pretreatment of carbon fibers by HNO₃ with different time on absorption of catalysts, which is related to the coverage of carbon nanotubes (CNTs) grown on Carbon fibers. The effects of surface modifications on the properties of carbon fibers were studied by X-Ray photoelectron spectroscopy. The modifications bring about variation in the chemical properties. The modification increased a large number of surface functional groups such as hydroxyl and carbonyl. The HNO₃ modification increases the catalysts absorption. The coverage of CNTs on CF increases with pretreatment time, which was studied by SEM.

761

Synthesis of Patterned Carbon Nanotubes Based on Anodic Aluminum Nano-Templates

Authors: Lei Shan Chen

Abstract: Carbon nanotubes based on anodic aluminum nano-templates embedded with different metal catalysts were synthesized and the influence on the morphology of the products of the gas flow rate and the reaction time was closely investigated. The samples were characterized by field-emission scanning electron microscope. The results confirmed that the products are carbon nanotubes with controllable size and the morphology of the products were different with the different reation conditions.

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