Carbon nanomaterials encompass a variety of allotropes, each characterized by unique properties that make them suitable for diverse applications. The primary types of nanocarbons include:
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Carbon Nanotubes (CNTs): These are cylindrical structures with diameters typically in the nanometer range. CNTs can be single-walled (SWCNTs) or multi-walled (MWCNTs), with the former consisting of a single graphene layer and the latter composed of multiple concentric graphene cylinders. CNTs exhibit exceptional electrical and thermal conductivity, mechanical strength, and can be used in electronics, composites, and energy storage devices.
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Graphene: A single layer of carbon atoms arranged in a two-dimensional honeycomb lattice. Graphene is known for its high electrical conductivity, thermal conductivity, and mechanical strength. It is used in various applications including electronics, composites, and as a reinforcing agent in materials.
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Fullerenes: These are spherical, ellipsoid, or tubular-shaped molecules composed entirely of carbon, typically in the form of a closed cage. The most common fullerene is the C60 molecule, also known as buckminsterfullerene, which has a soccer ball-like structure. Fullerenes are used in materials science, electronics, and medicine, particularly in drug delivery systems.
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Carbon Nanofibers (CNFs): These are fibrous materials with a cylindrical nanostructure. They have a graphitic microcrystalline structure and are known for their high surface area, electrical conductivity, and mechanical properties. CNFs are used in composites, electrodes, and filtration systems.
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Carbide-Derived Carbon (CDC): CDC is produced by the selective extraction of metals from metal carbides, resulting in a carbon-rich material with a high surface area and tunable pore structure. CDCs are used in applications such as energy storage, catalysis, and gas separation.
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Carbon Nano-Onion (CNO): These are spherical carbon nanoparticles consisting of concentric graphene layers. CNOs have applications in catalysis, hydrogen storage, and as lubricants due to their unique structure and properties.
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MXenes: Although not purely carbon, MXenes are a class of two-dimensional materials composed of early transition metal carbides, nitrides, or carbonitrides. They have properties similar to graphene and are used in energy storage, electromagnetic interference shielding, and as catalysts.
Each of these nanocarbons offers unique properties that make them suitable for specific applications, ranging from electronics and energy storage to biomedical and environmental technologies. The synthesis and large-scale production of these materials continue to be a significant area of research, driven by the need for cost-effective and efficient methods to meet the growing demand for these advanced materials.
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