the Ni 2p signal of NiO nanofibers could be deconvoluted into
five peaks. The binding energies at 854.2, 856.1, and 861.4
eV were attributed to the Ni 2p3/2 peaks, and the 873.8 and
879.5 eV peaks were attributed to the Ni 2p1/2 peaks. The
Ni 2p3/2 peaks were assigned to Ni2+ ions in the NiO nanofibers
(30). The peak at 854.2 eV was due to NiO6 in octahedral
symmetry, and the peak at 856.1 eV was attributed to
NiO5 or Ni2+ in pyramidal symmetry according to the
experimental results and theoretical calculation of Sorian et
al.
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