Formation and microstructure of nickel oxide films

► Difference in NiO films formed on Ni plate or glass substrate were found. ► NiO particle sizes on Ni plate changed from nano to micron dimensions. ► NiO particle sizes on glass substrate changed from ∼16 to ∼27 nm. ► Raman and UV/Vis/NIR spectra are related to the microstructure of NiO films.