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Tunable structural color of anodic tantalum oxide films
Authors:Sheng Cui-Cui  Cai Yun-Yu  Dai En-Mei  Liang Chang-Hao
Institution:a Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;b Information Center, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
Abstract:Tantalum (Ta) oxide films with tunable structural color were fabricated facilely using anodic oxidation. The structure, components, and surface valence states of the oxide films were investigated by using gazing incidence X-ray diffractometry, X-ray photoelectron microscopy, and surface analytical techniques. Their thickness and optical properties were studied by using spectroscopic ellipsometry and total reflectance spectrum. Color was accurately defined using L*a*b* scale. The thickness of compact Ta2O5 films was linearly dependent on anodizing voltage. The film color was tunable by adjusting the anodic voltage. The difference in color appearance is resulted from the interference behavior between the interfaces of air-oxide and oxide-metal.
Keywords:anodic tantalum oxide  structural color  spectroscopic ellipsometry  optical interference
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