Supported Catalyst for Manufacturing Carbon Nanotubes, Carbon Nanotubes, and Manufacturing Method Thereof

A method for manufacturing carbon nanotubes, comprising:

• preparing a mixture comprising a metal precursor and a polymer gel;
• preparing a plate-shaped carrier by calcining the mixture;
• preparing a supported catalyst by attaching a plurality of metal catalyst particles comprising cobalt and vanadium to a surface of the plate-shaped carrier;
• and
• manufacturing carbon nanotubes by bringing the supported catalyst into contact with a carbon source.

Carbon nanotubes having an average straightness of 0.8 or more, which is represented by Equation 1 below:

• Average
• ⁢
• straightness
• =
• ∑
• k
• =
• 1
• n
• ⁢
• L
• k
• /
• V
• sum
• ,
• k
• n
• [
• Equation
• ⁢
• 1
• ]
• (in Equation 1, n is an integer of 10 to 100, Lk is a distance formed by connecting opposite endpoints of any single carbon nanotube in a straight line from an SEM image of the carbon nanotube, and Vsum,k is a sum of lengths of 5 to 20 two-dimensional vectors connected to each other along a shape of the single carbon nanotube when forming the respective 5 to 20 of the two-dimensional vectors between the opposite endpoints of the single carbon nanotube from the SEM image).