Abstract
One of the most common methods of carbon nanotubes (CNTs) synthesis is application of an electric-arc plasma. However, the final product in the form of cathode deposit is composed of carbon nanotubes and a variety of carbon impurities. An assay of carbon nanotubes produced in arc discharge systems available on the market shows that commercial cathode deposits contain about 10% CNTs. Given that the quality of the final product depends on carbon–plasma jet parameters, it is possible to increase the yield of the synthesis by plasma jet control. Most of the carbon nanotubes are multiwall carbon nanotubes (MWCNTs). It was observed that the addition of catalysts significantly changes the plasma composition, effective ionization potential, the arc channel conductance, and in effect temperature of the arc and carbon elements flux. This paper focuses on the influence of metal components on plasma-jet forming containing carbon nanotubes cathode deposit. The plasma jet temperature control system is presented.
Highlights
Carbon nanotubes (CNTs) are new materials with unique properties discovered in 1991 [1].Nowadays, CNTs are used in almost every area of life
(GTTTechnologies, Technologies, Herzogenrath, Herzogenrath, Germany) forfor calculations of of carbon element noticed that thatcarbon carbonparticles particlessuch such carbon ions, calculations carbon elementequilibrium
It can be noticed that containing temperature range characteristic for the arc profile, it is possible to obtain profiles of carbon elements carbon nanotubes soft core corresponds to the predominance of small carbon elements and carbon in the plasma jet (Figure 12)
Summary
Carbon nanotubes (CNTs) are new materials with unique properties discovered in 1991 [1]. One of the methods for plasma column parameters measurement is a temperature measurement based on the ratio of two spectral line intensities [29] Due to their electrical, optical, chemical and physical properties, carbon nanotubes are widely used in almost every industry. We must improve control of the synthesis process, Metal particles (catalysts) in the plasma column strongly change its parameters such as thermal especially the essential parameter, which is the temperature. In effect monitoring control systemdistribution, is requireddetermines for the synthesis process It may be realized stabilityand of the temperature the quality of theoptimization. An effective monitoring and control profile system is required for the synthesis process optimization It may be realized by plasma jet temperature measurement.
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