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Amorphous alumina is deposited on chemically etched nanoporous gold films using atomic layer deposition at room temperature. Nanoporous gold with ultrafine pores of 7nm in diameter is uniformly coated with alumina film as thin as 1.4nm. Localized surface plasmon resonance of gold skeleton exhibits a detectable red-shift in the optical transmittance spectra, the magnitude of which depends on the thickness...
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