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(a) Average BPT SERS spectra of 49 acquisitions, for the considered substrates: hexagonally closely packed arrays of PS nanospheres—CPA—with different diameters (d = 500, 750, 1000 nm), and different gold films (h = 20, 30, 40 nm). Measured enhancement factor for the different analysed geometry as a function of the CPA diameter (b) and gold layer thickness (c).
