Fig. 1

Optical properties of (PAH-MMT)_n films (open circles) as a function of the number of deposition cycles and of the same films after 14 h of contact with an aerated dopamine solution (filled circles, 2 g L⁻¹ in the presence of 50 mM Tris buffer at pH 8.5). a Film thickness, the full line corresponds to a linear regression to the experimental data (slope 389 nm per layer pair) and the dotted lines to the limit of the 95 % confidence interval. b Real part of the refractive index at λ = 632.8 nm. c Imaginary part of the refractive index at λ = 632.8 nm. The error bars correspond to one standard deviation over three measurements on the same sample. All the films where prepared in an independent experiment