Preparation and Characteristic of Secondprinting Type Carbon Nanotube Cathode for Triode Field Emission Display

With screen-printing technique,a novel carbon nanotube(CNT) cathode preparation method was developed.Using double-walled CNT as primary material,the mixing CNT paste was fabricated,in which the minute Ag particles were included.On the mixing CNT paste printed on the conducting electrode surface,the common CNT paste was prepared.The baked CNT pastes were sintered simultaneously in the chain sintering furnace to remove the organic solvent,and the second-printing type CNT cathode was formed after the proper overvoltage post-treatment process was conducted.With the fabricated second-printing type CNT cathode,the field emission characteristics could be improved significantly.The triode second-printing CNT cathode field emission display was fabricated,which exhibited higher luminous brightness and better luminescence image brightness uniformity.Comparing with the common CNT cathode field emission display,the turn-on electric field could be reduced from 2.15 V/μm to 1.75 V/μm and the maximum field emission current would be enhanced from 735.8 μA to 1 588.5 μA.The developed preparation method of CNT cathode possessed considerable potential for practical applications and the fabrication cost was low.