Summary: The metals commonly used as catalysts for the synthesis of carbon nanotubes (CNTs) through chemical vapor deposition (CVD) are copper (Cu) and nickel (Ni). These metals are chosen due to their differing properties and mechanisms that facilitate the growth of CNTs.
Explanation:
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Copper (Cu): Copper is used as a catalyst in CVD due to its low carbon solubility. This property leads to a surface growth mechanism where the graphene or CNTs form directly on the surface of the copper at high temperatures. The high temperature is necessary to decompose the hydrocarbon precursors, which then deposit on the copper surface to form the nanotubes. This mechanism is advantageous as it allows for precise control over the growth location and can lead to high-quality, single-layer graphene or CNTs.
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Nickel (Ni): Nickel, on the other hand, has a high carbon solubility. This characteristic results in a different growth mechanism known as surface segregation/precipitation. In this process, carbon atoms diffuse into the bulk of the nickel foil at high temperatures. During the cooling process, the carbon segregates and precipitates out of the nickel, forming graphene sheets or CNTs on the surface of the metal. This mechanism can lead to the formation of multilayer structures and is often used when thicker or more robust structures are desired.
Both copper and nickel are effective catalysts for CNT synthesis due to their ability to facilitate the decomposition of hydrocarbon precursors and the subsequent growth of carbon structures. The choice between these metals often depends on the specific requirements of the application, such as the desired thickness, quality, and uniformity of the CNTs.
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