Method for making nanostructures

A method of making nanostructures, the method comprising:

• suspending a carbon nanotube structure, wherein the carbon nanotube structure comprises a plurality of carbon nanotubes orderly aligned;
• forming a carbon nanotube composite structure by applying a first precoated layer and a second precoated layer on the carbon nanotube composite structure in that sequence, wherein a total thickness of the first precoated layer and the second precoated layer on outer surface of each of plurality of carbon nanotubes ranges from about 2 nanometers to about 10 nanometers;
• transferring the carbon nanotube composite structure on a substrate and treating the carbon nanotube composite structure with a solution;
• removing the carbon nanotube structure by annealing the carbon nanotube composite structure in an annealing temperature from about 500° C. to about 700° C., wherein both the first precoated layer and the second precoated layer are softened and contracted.