Patent ID: 7927652

Claim:
A method for manufacturing a field emission electron source, the method comprising the steps of: providing a substrate, a carbon nanotubes slurry and a conductive slurry; applying the conductive slurry onto the substrate to form a conductive slurry layer; applying the carbon nanotubes slurry onto the conductive slurry layer to form a carbon nanotubes slurry layer; and solidifying the substrate at a temperature of 300 to 600 degrees centigrade so as to form the field emission electron source; wherein the carbon nanotubes slurry comprises an organic carrier and carbon nanotubes suspended in the organic carrier, and a length of the carbon nanotubes is in the range from 1 to 100 microns, and a diameter of the carbon nanotubes is in the range from 1 to 100 nanometers; wherein the step of providing the carbon nanotubes slurry comprises: preparing the organic carrier, the organic carrier comprising terpineol, dibutyl phthalate, and ethyl cellulose; dispersing the carbon nanotubes in a dichloroethane so as to form a carbon nanotube solution; mixing the carbon nanotube solution and the organic carrier by ultrasonic dispersion; and heating the mixture of the carbon nanotube solution and the organic carrier in water bath so as to vaporize the dichloroethane totally.