Method for making transparent carbon nanotube composite films

A method for making more than one transparent carbon nanotube composite films comprising the following steps:

• (a) providing a plurality of transparent carbon nanotube film structures comprising a part of carbon nanotubes protruding from a surface of the plurality of transparent carbon nanotube film structures;
• (b) providing a supporting substrate, the supporting substrate comprising a surface;
• (c) placing the plurality of transparent carbon nanotube film structures on the surface of the supporting substrate;
• (d) immersing the plurality of transparent carbon nanotube film structures with the supporting substrate into a transparent polymer solution having a surface, and pressing down the part of carbon nanotubes protruding from the surface of the plurality of transparent carbon nanotube film structures under pressure of the transparent polymer solution to make the surface of the plurality of transparent carbon nanotube film structures contact with each other firmly, wherein the supporting body is substantially vertical to the surface of the transparent polymer solution;
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• (e) removing the plurality of transparent carbon nanotube film structures with the supporting substrate from the transparent polymer solution, to form a plurality of transparent carbon nanotube composite film structures, light transmittance of the plurality of transparent carbon nanotube composite film structures is higher than light transmittance of the plurality of transparent carbon nanotube film structures.

A method for making a transparent carbon nanotube composite film comprising the following steps:

• (a) providing a transparent carbon nanotube film structure comprising a plurality of first carbon nanotubes substantially parallel to a surface of the transparent carbon nanotube film structure, a plurality of second carbon nanotubes protruding from the surface of the transparent carbon nanotube film structure, and a plurality of interspaces defined by the plurality of first carbon nanotubes and the plurality of second carbon nanotubes;
• (b) placing the transparent carbon nanotube film structure on a supporting body;
• (c) vertically immersing the transparent carbon nanotube film structure with the supporting body into a transparent polymer solution, pressing down the plurality of second carbon nanotubes by a pressure from the transparent polymer solution to make the plurality of second carbon nanotubes and the plurality of first carbon nanotubes in a same planar surface, and filling the transparent polymer solution into the plurality of interspaces;
• and
• (d) vertically removing the transparent carbon nanotube film structure with the supporting body thereon from the transparent polymer solution, to form the transparent carbon nanotube composite film structure.