Abstract
Carbon nanotubes (CNTs) are known as nano-architectured allotropes of carbon, having graphene sheets that are wrapped forming a cylindrical shape. Rolling of graphene sheets in different ways makes CNTs either metals or narrow-band semiconductors. Over the years, researchers have devoted much attention to understanding the intriguing properties CNTs. They exhibit some unusual properties like a high degree of stiffness, a large length-to-diameter ratio, and exceptional resilience, and for this reason, they are used in a variety of applications. These properties can be manipulated by controlling the diameter, chirality, wall nature, and length of CNTs which are in turn, synthesis procedure-dependent. In this review article, various synthesis methods for the production of CNTs are thoroughly elaborated. Several characterization methods are also described in the paper. The applications of CNTs in various technologically important fields are discussed in detail. Finally, future prospects of CNTs are outlined in view of their commercial applications.
Highlights
Carbon is an astonishing element, due to the reason that it is the element necessary for all life processes, and because of the fact that it can occur in various allotropic forms [1].Conventionally, carbon materials consist of graphite blocks, the category under which activated carbons, carbon blacks, and diamonds are present
single‐walled carbon carbon nanotubes nanotubes (SWCNTs) have been detected in the post-flame region of a premixed acetylene/oxygen/argon flame operated at 50 Torr (6.7 kPa), using the vapor of iron pentacarbonyl as a source of metallic catalyst, Nanotubes are observed to combine and form masses of between 40 and 70 mm, above the burner
Carbon nanotubes (CNTs)-based thin sheets are investigated as valid substituents for indium tin oxide (ITO) transparent conductors, owing to their extra flexible nature, and they have the potential to be used in touch screens and flexible displays as a highly transparent, conductive, and cost-effective alternative [225]
Summary
Carbon is an astonishing element, due to the reason that it is the element necessary for all life processes, and because of the fact that it can occur in various allotropic forms [1]. The recently developed materials of carbon include nanotextured and nanosized carbons. The nanosized carbons (or nanocarbons) comprise fullerenes, graphene and CNT [2]. Discovery of CNTs of inCNTs recentin is ascribed to Iijima, who for thefor first by Oberin in recent is to who the first by1976. CNTs exist in three unique geometries, which are armchair, of of approximately approximately 1/50,000th. The mechanical, electrical, electrical, optical, and other and properties of CNTs are armchair, zig‐zag, chiral. Depending on rolling up of of sheets, CNTs can be either narrow-band semiconductors or metals [18]. Some nanotubes behave the graphene sheets, CNTs can be either narrow‐band semiconductors or metals. Some the graphene sheets, CNTs can be either narrow‐band semiconductors or metals [18].
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