Patent ID: 8308930
Filing Date: 2012-11-13
Classification: C25D,D01F,H01J

Abstract:
1. A method for manufacturing a cold cathode comprising: immersing a metal tip into a carbon nanotube (CNT) colloid solution, wherein the metal tip has a conical-shaped apex with a radius from about 10 nm to about 700 nm; withdrawing the metal tip from the CNT colloid solution to form a carbon nanotube (CNT) rope attached to the conical-shaped apex of the metal tip and extending between the metal tip and the CNT colloidal solution, wherein an influx of carbon nanotubes from the CNT colloidal solution occurs towards the metal tip due to a meniscus and the influx is in the range of about 1 cm/hour to about 9 cm/hour; immersing the CNT rope in an electroplating solution comprising at least one metal; and applying a voltage to the CNT rope to deposit at least a portion of the metal on the CNT rope.