Substrate effect on the morphology of as-grown carbon nanocoils

We demonstrate the substrate effect that the carbon nanocoils were synthesized by the concentration of carboxylic acid metals in the solution. Carbon nanocoils (CNCs) have been synthesized by chemical vapor deposition using 2 metal-catalyzed pyrolysis of acetylene at 700°C, under 1 atm. The concentration of catalytic solutions leads to various characteristics of carbon nanocoils. Being observed by SEM, CNCs have line diameter of 20 nm ~ 350 nm, coil diameter of 100 nm ~ 1500 nm, and pitch of 100 nm ~ 1300 nm. Furthermore, the technique is scalable and facilitates the integration of the patterned CNCs with the micromachined electronic devices.