Patent ID: 9206049
Filing Date: 2015-12-08
Classification: B01J,B82Y,C01B,C01P,Y10S,Y10T

Abstract:
1. A method for making carbon nanotubes, the method comprising steps of: (a) providing a growing device, wherein the growing device comprises a reacting room having a gas inlet and a gas outlet spaced from the gas inlet; (b) forming a catalyst layer on a first planar surface of a growing substrate; (c) placing the growing substrate and a receiving substrate having a second planar surface in the reacting room, wherein the growing substrate and the receiving substrate are located between the gas inlet and the gas outlet and spaced from each other, the growing substrate is closer to the gas inlet than the receiving substrate, and the first planar surface and the second planar surface are parallel with each other; (d) introducing a carbonaceous gas in the reaction room to form a gas flow along a direction from the gas inlet to the gas outlet and growing a first plurality of carbon nanotubes from the growing substrate, wherein the first plurality of carbon nanotubes are brought above the receiving substrate by the gas flow; (e) stopping the introducing the carbonaceous gas such that the first plurality of carbon nanotubes deposits on the second planar surface of the receiving substrate; (g) changing the growing substrate to a second growing substrate, and repeating steps (d) and (e) to grow and deposit a second plurality of carbon nanotubes on the second planar surface of the receiving substrate to form a first carbon nanotube film having carbon nanotubes extending along the same direction; (h) changing the second growing substrate to a third growing substrate, rotating the receiving substrate in a manner that keeps the first planar surface and the second planar surface parallel with each other, and repeating steps (d) and (e) to grow and deposit a third plurality of carbon nanotubes on the second planar surface of the receiving substrate to form a second carbon nanotube film on the first carbon nanotube film, wherein the carbon nanotubes of the first carbon nanotube film and the carbon nanotubes of the second carbon nanotube film extend along different directions; and (f) treating the carbon nanotubes that are deposited on the receiving substrate with an organic solvent.