Experimental Research On Synthesis Of Aligned Carbon Nanotubes Arrays In V-shaped Pyrolysis Flame

Carbon nanotubes (CNTs) are excellent nanomaterial which have been showing an attractive prospects of application,such as:hydrogen storage, field emission and nano-scale electronic devices,due to their outstanding electrical, chemical and physical properties. Aligned CNTs(ACNTs) arrays is a kind of orientation form of carbon nanotubes,which have a much more concentrated growth density and neatly array,so the application of ACNTs is more easily than the mussy and circumvolute CNTs, especially in a field emission cathode materials.V-flame pyrolysis method is a simple, efficient and low-cost synthesis of carbon nanotubes.However, beacause of the intense combustion in flame,the synthesis of carbon nanotubes is usally influenced by hydrocarbon fuels, temperature, catalyst type, and many other factors, which always result in messy and intertwined state, that severely restrict the application of carbon nanotubes.In this paper the experimental method of systhesis of CNTs in V-shaped pyrolysis flame is improved to achieve directional growth of CNTs on the base of fomer research of Aligned CNTs array.Three different method:Coating,electric field induced and magnetron sputtering were carefully studied in the experiment. It is found that coating can not synsthesis Aligned CNTs whatever the method is physics or pyrolysis coating.Also different material of sampling plate is investigated in coating method. Through the electric field induced,CNTs can grow in a direction along the electric field line.The means of introduction of electric field,the size of the bias voltage and the sampling time have great impact on the growth of carbon nanotube arrays in V-shaped flame,therefoe they were specially studied via different experiment results. The best way to introduce the electrostatic field, the voltage window was obtained and the growth mechanism of Aligned CNTs in electrostatic field was discussed.The effects of temperature on the synthesis of carbon nanotube arrays in magnetron sputtering method is investigated, with an ideal temperature obtained. A comprehensive comparision of three different method was made, which lay a theoretical and experimental foundation for the mass synthesis of Aligned CNTs in V-shaped pyrolysis flame.