Synthesis and Characterization of Nano Au/NPAA Templates

A modified two-step anodization process was applied for preparing highly ordered nanoporous anodic alumina (NPAA) templates. The interpore distance and the diameter of the NPAA pores were, 100 nm and 80 ± 2 nm, respectively. Then, Au sputtering was carried out over the fabricated template using r.f. magnetron sputtering. The morphological characterization showed that hexagonal Au nanoarrays have been deposited on the top surface of the NPAA template. Simultaneously, the interior walls of the NPAA pores have been decorated with fine Au nanoparticles. The Au-coated samples showed brilliant and statured structural colors due to the surface plasmon resonance (SPR) enhancement of NPAA optical interference. The SPR wavelength is increased from 466 nm to 512 nm by increasing the Au deposition time from 1 to 2 min.

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