Patent ID: 9691526
Date: 2017-06-27
CPC Classifications: B82Y,C01B,H01B

Claim:
1. A method for making carbon nanotube composite film, comprising: providing an original carbon nanotube film comprising a plurality of carbon nanotubes joined end to end by van der Waals attractive force and substantially extending along a first direction, and the plurality of carbon nanotubes in the original carbon nanotube film define a plurality of micropores; forming a patterned carbon nanotube film by patterning the original carbon nanotube film to define a plurality of through holes arranged into a plurality of rows of through holes in the original carbon nanotube film along the first direction, each row of through holes comprising at least two spaced through holes, a space between two adjacent through holes is greater than a size of one of the plurality of micropores in the original carbon nanotube film; the patterned carbon nanotube film comprises a plurality of connecting parts and a plurality of extending parts both extending along the first direction, the plurality of connecting parts is separated from each other by the plurality of though holes along the first direction, and the plurality of extending parts is separated from each other by the plurality of connecting parts along a second direction crossed with the first direction; the plurality of extending parts comprises a first portion of the plurality of carbon nanotubes; and the plurality of connecting parts comprises a second portion of the plurality of carbon nanotubes; and treating the patterned carbon nanotube film with a polymer solution comprising an organic solvent and a polymer material dissolved in the organic solvent such that the plurality of extending parts is shrunk into a plurality of carbon nanotube linear units; a pulling force is produced in a process shrinking of the plurality of extending parts, and an interfacial tension is produced between the plurality of connecting parts and the organic solvent; and extending directions of the second portion of the plurality of carbon nanotubes are shifted into directions intersecting so as to cross the first direction, by the pulling force and the interfacial tension, to form a plurality of carbon nanotube groups; and the plurality of carbon nanotube groups comprises the second portion of the plurality of carbon nanotubes intercrossed with each other.