Patent ID: 7682658

Claim:
A method for making an array of carbon nanotubes, comprising the steps of: providing a substrate with a first catalyst thereon; disposing the substrate on a quartz boat; disposing a second catalyst on the quartz boat and adjacent to the substrate on the quartz boat; disposing the quartz boat in a reaction chamber having a gas inlet configured for introducing a carbon source gas and a carrier gas into the reaction chamber and a gas outlet; heating the reaction chamber to a predetermined temperature and introducing the carbon source gas into the reaction chamber along a direction from the second catalyst to the substrate, whereby the second catalyst reacts with the carbon source gas thereby producing a resultant for promoting catalytic activity of the first catalyst; and growing an array of carbon nanotubes on the substrate; wherein the first and second catalysts are in different forms, and the second catalyst is in direct contact with the quartz boat and beside the substrate.