Patent ID: 7625544
Filing Date: 2009-12-01
Classification: B01J,B82Y,C01B,Y10T

Abstract:
1. A method for manufacturing carbon nanotubes, comprising steps of: providing a substrate having a catalyst layer formed thereon; providing a semi-closed quartz boat carrying the substrate and placing the semi-closed quartz boat in a reaction chamber; providing gas introducing tube having an end running through the quartz boat; introducing a carbon source gas containing carbon element into the reaction chamber for growing carbon nanotubes from the catalyst layer; switching off the introducing of the carbon source gas and simultaneously introducing a disturbance gas from the gas introducing tube into the reaction chamber to promptly reduce a concentration of the carbon source gas proximate to the catalyst layer and blow the residual carbon source gas away from the catalyst layer, thereby ceasing the growth of the carbon nanotubes instantly to prevent catalyst particles in the catalyst layer from being fully embedded inside of the carbon nanotubes; and separating the carbon nanotubes from the catalyst layer.