Abstract
We prepare the sandwich-like carbon nanotubes/carbon nanoparticles film/vertically aligned carbon nanotubes on silicon substrate (CNTs/CNPs/VACNTs/silicon) by pyrolysis of FePC at 880 °C. The field emission properties of the CNTs/CNPs/VACNTs/silicon are investigated. The lower turn-on electric field of 0.78 V/μmat a current density of 20μA/cm2, lower threshold electric field of 1 V/μmat a current density of 1 mA/cm2and good emission current stability are observed. The unique structure not only provides large field enhancement factor but also strongly reduces the field-screening effect. The above results make CNTs/CNPs/VACNTs/silicon an effective field emitter.
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