Patent ID: 8828256

Claim:
A method for fabricating a carbon nanotube film, the method comprising the steps of: (a) providing an array of carbon nanotubes formed on a substrate, the array of carbon nanotubes comprises a top section comprising disordered CNTs, wherein growing directions of the disordered CNTs are not perpendicular to the substrate, wherein step (a) comprises: (a1) forming a catalyst layer on the substrate; (a2) annealing the substrate with the catalyst layer in an ambient temperature of about 700° C. to about 900° C; (a3) heating the substrate with the catalyst in an ambient temperature of about 500° C. to about 740° C. with a protective gas; and (a4) growing the array of carbon nanotubes on the substrate by supplying only a carbon source gas for about 5 to about 30 minutes, wherein the carbon source gas is a hydrocarbon gas; (b) etching the array of carbon nanotubes by a plasma treatment to remove the disordered CNTs at the top section of the array of carbon nanotubes; and (c) obtaining a carbon nanotube film from the array of carbon nanotubes that has been plasma treated.