Effect of Precursor Concentration on Structural Optical and Electrical Properties of NiO Thin Films Prepared by Spray Pyrolysis

Table 2

The assignments of the most important bands in the FT-IR spectra of NiO thin films sprayed at 500°C with different of precursor concentration.

Samples	Positions (cm^−1) in this work in respect to the concentration	Assignments	Positions (cm^−1) in other works
0.015, 0.03 and 0.04 M	(409), (411), (412)	Nickel-oxygen interaction	410 [27, 28]
	(475), (474)	Ni-O stretching vibration	474.5-475-475 [29–31]
	(545), (550), (556)	bands metal- oxygen vibrations-stretching	450-550 [32], 450-560 [33], 552 [34],
	(605), (606)	Ni-O-H stretching band	607-619 [35, 36]
	(643-669), (641-668), (641)	Ni-O stretching vibration	600-700 [37], 660 [38], 663 [39]
	(779-756-723), (778-754-722),	Mode bending modes O-M-O	400-820 [34], 400-850 [40]
0.05 and 0.1 M	(407), (418)	Nickel-oxygen interaction	410, 413 [27, 28, 41]
	(437), (437)	Ni-O Absorption band	435.93-437 [29, 42]
	(466-542-564), (458-480)	Bond stretching; vibration Ni-O	450-560 [33], 460 [43], 445-490 [44], 470 [35, 45],
	(511), (—)	Bending modes O-M-O	400-500 [46]
	(520), (520)	Nickel-oxygen stretch	520-520-524 [47–49]
	(—), (566-596)	vibrations Ni-O bond	660 [37], 663 [38]
	(608-690), (624-696-671)	band Ni-O-H stretching; Bending between Ni and O	607 [35], 600-700 [37], 624 [34],
	(723-790-820), (720-754-794-820)	Mode bending modes O-M-O	400-820 [34], 400-850 [40]