Abstract
Nickel oxide-based photochromic composite films were fabricated by combining nickel nitrate in methanol solution with a transparent urethane resin. The resulting nickel oxide-based composite film showed a reversible photochromic property that was similar to the electrochromic property in nickel oxide-based films. IR spectra revealed that the valence state of nickel in the composite films changed from “+3” to “+2” under UV irradiation. The Ni-based particles dispersed in the films had sizes of 40–100 nm.
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