| Abstract: | This paper reports that bunchy flake-like nano-graphite crystallitefilms (BNGCFs) were deposited on Si substrates by using the microwavechemical vapour deposition technique. Furthermore the BNGCFs werecharacterized by x-ray diffraction spectra, scanning electronmicroscopy, Raman spectra and field emission (FE) $I$--$V$measurements, and a lowest turn-on field of 1.5,V/$mu $m, and a highaverage emission current density of 30,mA/cm$^{2}$ at a macroscopicelectric field of 8.0,V/$mu $m were obtained. The $J$--$E$ datadid not follow the original Fowler--Nordheim (F--N) relation sincethey were not well represented in the F--N plot by a straight line.A model considering the F--N mechanism, and the statistic effects of FE tipstructures has been applied successfully to explain all the FE dataobserved for $E<8.8$,V/$mu $m. |
