Patent ID: 7749478

Claim:
A method of controlling morphology of carbon nanotubes, the method comprising: providing a substrate for growing at least one carbon nanotube; locating a perpendicular field electrode at predetermined distance away from the substrate defining a field space between the substrate and the perpendicular field electrode; arranging a plurality of peripheral field electrodes in pairs so that the peripheral field electrodes in each pair are at opposite respective ends of the field space and so that the pairs are disposed at successively greater distances from the perpendicular field electrodes; activating the perpendicular field electrode for a first predetermined period of time for growing the at least one carbon nanotube in a direction perpendicular to the substrate; and sequentially activating each pair of peripheral field electrodes from an uppermost pair to a lower most pair for a second predetermined period of time to from a curved hook on an end of the at least one carbon nanotube opposite the substrate.