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A novel post-treatment method is reported for improving the field emission characteristics of screen-printed carbon nanotubes/nanofibers (CNTs/CNFs) cathodes.After the treatment at the temperature of 500℃ in H_2 and C_2H_2 gas for 20 minutes,the CNTs/CNFs cathodes exhibit much better field emission properties than those untreated.The emission current increases from 0.02 mA/cm~2 to 0.5 mA/cm~2 at 3.9 V/μm with a decrease in the turn-on field from 2.4 V to 1.8 V ,and the emission site density is increased by almost four orders in magnitude.The enhanced field emission of treated CNTs/CNFs cathodes is attributed to the appearance of a large number of exposed CNTs/CNFs caused by heat treatment.This surface morphology is very favorable for the electron field emission.
A novel post-treatment method is reported for improving the field emission characteristics of screen-printed carbon nanotubes / nanofibers (CNTs / CNFs) cathodes. After the treatment at the temperature of 500 ° C in H 2 and C 2 H 2 gas for 20 minutes, the CNTs / CNFs cathodes exhibit much better field emission properties than those untreated. The emission current increases from 0.02 mA / cm ~ 2 to 0.5 mA / cm ~ 2 at 3.9 V / μm with a decrease in the turn-on field from 2.4 V to 1.8 V , and the emission site density is increased by almost four orders in magnitude. The enhanced field emission of treated CNTs / CNFs cathodes is attributed to the appearance of a large number of exposed CNTs / CNFs caused by heat treatment. This surface morphology is very favorable for the electron field emission.