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We report the first hydrothermal RF (radio-frequency) sputtered tungsten (W) thin films. Platelike tungsten trioxide hydrate (WO 3 ·H 2 O) films with a thickness of ca. 1μm were obtained in nitric acid from a sputtered W layer on fluorine-doped tin oxide (FTO) glass. The platelike films change to monoclinic WO 3 and become transparent after annealing at 450°C Photoelectrochemical...
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