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Absorptivity in the UV/vis range of carboxylated EuPH (C-EuPH) samples. Thickness of all the films is in the range of 400–1000 nm (Table S1). It is evident how the increase in the 2-carboxy-5,6-dihydroxyindole (DHICA)-eumelanin content increases the absorption in the UV region of the films. PEDOT:PSS, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate).
