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

Abstract

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.

Super Black Coating on the Commercial Black Anodized Al(6061) by Direct and Scalable CVD–Growth of Carbon Nanofibers

“…CVD Growth of CNFs: The CNF structures on Al(6061) were made using the commercial thermal CVD system (ScienTech Inc.) at atmospheric pressure, the procedure for which has been detailed elsewhere. [30][31] Al(6061) substrates were cleaned using isopropanol alcohol, ethanol, and de-ionized water in ultrasonication for 15 min each and then dried using an air gun. Prior to synthesis, the commercial black anodized Al(6061) was annealed in an oven at 80 °C for 10 h to form a uniform layer of Ni catalyst in the black dye-coated anodized Al(6061), which is necessary to enhance the efficient growth of carbon nanostructures.…”

New trends in nanofibers functionalization and recent applications in wastewater treatment

“…In 2016, the pyrolysis of hydrocarbon gas or carbon monoxide using chemical vapor deposition, and the synthesis of carbon nanofiber was performed using transition metals, such as Ni, Fe, and Co as catalysts at a temperature of 600–900°C. In that study, ethylene gas was the carbon source for the synthesis of carbon nanofibers 19 . Recently, carbon nanofibers were synthesized by catalytic vapor deposition method on the surface of Cu/SiO 2 substrate.…”

Enhancement of Room Temperature Ethanol Sensing by Optimizing the Density of Vertically Aligned Carbon Nanofibers Decorated with Gold Nanoparticles

“…The use of vertically aligned CNF arrays with wellengineered properties and uniform diameter and length deposited by Chemical Vapor Deposition (CVD) was shown to provide a unique structure for gas sensing [3]. By adjusting the growth parameters in the CVD method, one can change the diameter, length, and the number of fibers per unit area [4][5][6][7][8]. Especially the latter is typically difficult to control in competing technologies like vertically aligned carbon nanotubes.…”