Process of direct growth of carbon nanotubes on a substrate at low temperature

A process of direct low-temperature growth of carbon nanotubes on a substrate, which comprises the following steps:

• a) forming a metal support layer on a substrate;
• b) forming a metal catalyst layer on said metal support layer;
• c) forming a bonding metal layer on said catalyst metal layer;
• and
• d) growing carbon nanotubes on a surface of said substrate having said metal support layer, the metal catalyst layer and the bonding metal layer thereon by using a carbon source gas through a thermal chemical vapor deposition (CVD);
• wherein said metal support layer and said bonding metal layer separately have a thickness of 0.1-50 microns, and the former is thicker than the later;
• said metal support layer comprises a noble metal;
• said bonding metal layer comprises a noble metal;
• and
• said metal catalyst layer comprises a metal selected from the group consisting of Fe, Co, Ni, and an alloy thereof.