| Summary: | Magnesium hydroxide (Mg(OH)<sub>2</sub>) thin films were deposited by the drop-dry deposition (DDD) method using an aqueous solution containing Mg(NO<sub>3</sub>)<sub>2</sub> and NaOH. DDD was performed by dropping the solution on a substrate, heating-drying, and rinsing in water. Effects of different deposition conditions on the surface morphology and optical properties of Mg(OH)<sub>2</sub> thin films were researched. Films with a thickness of 1−2 μm were successfully deposited, and the Raman peaks of Mg(OH)<sub>2</sub> were observed for them. Their transmittance in the visible range was 95% or more, and the bandgap was about 5.8 eV. It was found that the thin films have resistivity of the order of 10<sup>5</sup> Ωcm. Thus, the transparent and semiconducting Mg(OH)<sub>2</sub> thin films were successfully prepared by DDD.
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