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20 November 2012 Brilliant and tunable color by changing pore diameter of metal-coated porous anodic alumina
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Porous anodic alumina (PAA), with highly ordered microstructures, has attracted much attention due to some unique physical and optical characteristics. In recent years, PAA is also used to obtain different colors by methods such as growing nanowires, tuning pore depth, or sputtering metal on PAA surface. In this paper, we report a simple and precisely controllable method to tune color by changing the pore diameter of PAA. In order to obtain PPA with different pore diameter, we first prepare the PPA membrane by two step anodization of high purity aluminium foil in acidic solutions and then immerse the fabricated PPA membrane into phosphoric acid to enlarge pore diameter. The different pore diameters of PAA are controlled by immersed time in phosphoric acid. After sputtering metal on surface of PAA, the brilliant color can be seen on the surface of PAA. Different colors of PAA film with metal-coated are obtained using this method and colorful patterns are successfully fabricated. The physical model of the PAA is constructed and the mechanism of tuning color is analyzed. It is concluded that the color can be tuned by changing pore diameter of the PAA membrane. This method will be of potential use in decoration, color displays and anti-counterfeiting technology.
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Jiawen Li, Zhiqiang Zhu, Ping Deng, Yanlei Hu, Jiaru Chu, and Wenhao Huang "Brilliant and tunable color by changing pore diameter of metal-coated porous anodic alumina", Proc. SPIE 8564, Nanophotonics and Micro/Nano Optics, 85640Q (20 November 2012);

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