α-Ni(OH) 2 thin films have been synthesized on various substrates by liquid phase deposition method. The deposited films were characterized by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscope (SEM). The addition of boric acid (H 3 BO 3 ) as fluoride scavenger to the treatment solution destabilized the [NiF x (x-2n)-] metal-fluoro complex bonds and forced the oxide precipitation, resulting in the formation of α-Ni(OH) 2 . The obtained thin films exhibited transparency and interference color. SEM images showed that the films consisted of interconnected thread-like fibers with a width of ca. 50 nm. The deposition process and morphology of fibrous particles showed strong dependence to the initial concentrations of H 3 BO 3 solution and temperature. Transparency and interference color were related to the film thickness, which can be controlled by the concentration of Ni metal-fluoro complex and the reaction time. Calcination at 500 o C led to the formation of NiO particles. For comparison purpose, β-Ni(OH) 2 thin films prepared by "direct deposition" method which consists of simple heterogeneous nucleation in an aqueous solution without adding boric acid is reported.
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