Due to the diverse properties and scope of application possessed by CNTs, it is of paramount importance that CNTs are produced in a sufficiently competitive manner compared to existing technology. Research conducted over two decades since the discovery of CNTs at the Iijima Laboratory in 1991 has not helped in reducing costs or producing CNTs with well-defined properties on a large scale (Kumar, n.d.). This is mainly due to the complexity of the growth mechanism of CNTs. Extraordinary properties and applications cannot be achieved without fundamental understanding of the growth mechanism of carbon nanotubes (Kumar, n.d.). There are several methods for producing carbon nanotubes in a laboratory. Some of the widely used techniques include 1) Arc discharge method 2) Laser ablation 3) Chemical vapor deposition (Ando, 2004) But here we only discuss chemical vapor deposition which helps for mass production of CNTs. The process discussed in this article is otherwise an imitation of chemical vapor deposition. Chemical vapor deposition is the most popular method for producing CNTs: the process involves a high-temperature hydrocarbon source such as methane that is decomposed in the presence of a metal catalyst (Ando, 2004). There are various types of chemical vapor deposition processes, but this method is recognized as catalytic chemical vapor deposition which is relatively less expensive than laser ablation and arc discharge methods (Ando, 2004). Chemical vapor deposition is a flexible and streamlined way to produce carbon nanotubes. It is a very versatile process where the starting hydrocarbon can be supplied in any form (solid, liquid or gaseous) and we can use substrates such as ceramic bricks, concrete, glass wool, etc. The growth of C...... halfway through the article ......conventional laboratory synthesis method.1) This process uses gases from industrial waste that are released into the atmosphere, which in turn profits from pollution (NAIR & (IN), 2012).2 ) The substrate-coated catalyst can be used several times depending on the exposure conditions and therefore reusable (NAIR & (IN), 2012).3) This process is completely negative to carbon and earn carbon credits for the end user.4) The demand for Carbon nanotubes requires mass production and this is a very sustainable model as there are multiple industries everywhere. 5) The energy that is lost to the environment is used here to recover a product with wide application. 6) The raw carbon nanotubes recovered from this process can be incorporated directly into composites or rubber tires which increase tensile strength and this is a direct application (NAIR & (IN), 2012)
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