Carbon nitride films were deposited by filtered cathode vacuum arc combined
with radio frequency nitrogen ion beam source. Both visible Raman spectros
copy and UV Raman spectroscopy are used to study the bonding type and the c
hange of bonding structure in carbon nitride films with nitrogen ion energy
. Both C-N bonds and C dropN bonds can be directly observed from the deconv
olution results of visible and UV Raman spectra for carbon nitride films. V
isible Raman spectroscopy is more sensitive to the disorder and clustering
of sp(2) carbon. The UV (244 nm) Raman spectra clearly reveal the presence
of the sp(3) C atoms in carbon nitride films. Nitrogen ion energy is an imp
ortant factor that affects the structure of carbon nitride films. At low ni
trogen ion energy (below 400 eV), the increase of nitrogen ion energy leads
to the drastic increase of sp(2)/sp(3) ratio, sp(2) cluster size and C-N b
onds fraction. At higher nitrogen ion energy, increase leads to the slight
increase of C dropN bonds fraction and sp(2) cluster size, slight decrease
of C-N bonds fraction and sp(2)/sp(3) ratio. (C) 2001 Elsevier Science B.V.
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