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 H2 an...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 H2 and O2H2 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.展开更多
文摘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 H2 and O2H2 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.