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(a). SEM image of the Au-nanoparticle (NP) layer after drying naturally. (b) The distri-bution of the diameters of the Au NPs. (c) Cross-sectional SEM image of five-Au/Al2O3-bilayer structure. The inset shows a local-magnification image. (d) The root-mean-square (RMS) roughness of the Al film can be seen from the white line drawn in the inset.
