A novel synthesis of high density aligned carbon nanotubes in the liquid-phase has been demonstrated. Carbon nanotubes have been grown on Si substrate in methanol, and other alcohols by using Fe catalyst. Hollow multiwall carbon nanotubes external diameters ranging from 6 to 26nm standing well on the Si substrate were obtained. The growth rate of carbon nanotubes was∼several microns per minutes. The large difference in temperature between the substrate surface and the liquid can cause very high nucleation density and high growth rate and affect the growth direction of the carbon nanotubes. Very few amorphous components was produced among the carbon nanotubes because reaction proceed only on the hot substrate and no reaction can proceed in the liquid phase. This simple method can promise to give a large scale production of the carbon nanotubes.
