Patent ID: 8962090
Filing Date: 2015-02-24
Classification: B82Y,C01B,Y10S,Y10T

Abstract:
1. A method for making a variable-density carbon nanotube film comprising the following steps: (a) providing a drawn carbon nanotube film comprising a plurality of carbon nanotubes aligned along a first direction; (b) producing a laser beam by opening a laser device; (c) forming a first row of thin regions on the drawn carbon nanotube film by causing a relative motion between the laser beam and the drawn carbon nanotube film along the first direction; (d) shutting the laser device thereby preventing the laser beam from striking the drawn carbon nanotube film and causing a relative motion between the laser device and the drawn carbon nanotube film along a second direction, wherein the second direction is perpendicular to the first direction; (e) opening the laser device and forming a second row of thin regions on the drawn carbon nanotube film by causing a relative motion between the laser beam and the drawn carbon nanotube film along the first direction, wherein the second row is spaced from the first row; and (f) forming a plurality of rows of thin regions spaced from each other on the drawn carbon nanotube film by repeating the steps (d) to (e); wherein a spacing between each two adjacent rows of thin regions ranges from about 1 micrometer to about 5 millimeters, and a density of each of the plurality of rows of thin regions ranges from about 50% to about 80% of a density of normal regions in the drawn carbon nanotube film.