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Fabrication scheme for the optically active AuNP monolayer film. (a) The workflow of LbL and calcination steps on a PAH-coated glass slide. (b) TEM image of 13 nm AuNPs from solution, inset scale bar represents 50 nm. (c) SEM image of immoblized and calcinated AuNPs, scale bar represents 200 nm. (d) A photograph of the nanofilm substrate.
