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Fig. 1

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SEM images of the gold nanofilms with average thicknesses of (a) 3 nm, (b) 4.5 nm, (c) 6 nm, and (d) 9 nm, sputtered on high-resistivity Si substrates.
SEM images of the gold nanofilms with average thicknesses of (a) 3 nm, (b) 4.5 nm, (c) 6 nm, and (d) 9 nm, sputtered on high-resistivity Si substrates.