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SEM images of the Ag NPs films obtained by thermal evaporation onto DES (ChCl/urea, ratio molar 1:2) with different deposition pressures with constant current (4 A). (a, e) 1 × 10–2 mbar, (b, f) 1 × 10–3 mbar (c, g) 1 × 10–4 mbar, and (d, h) 2 × 10–4 mbar, respectively. (i) UV–vis absorption spectra of Ag NPs films obtained at different pressures. (j) XRD pattern of Ag nanoparticles film obtained at 2 × 10–4 mbar.
