The primed substrates were immersed in an aqueous (pH 5) or aqueous ammonia (pH 9) GO sol (0.2 g/L) for 15 min and then rinsed with deionized water and dried in flowing Ar. The samples were then immersed in aqueous PAH solutions for 15 min, rinsed with deionized water, and dried in flowing Ar.Multilayer GO/PAH films were grown by repeating these adsorption cycles. Preliminary experiments had shown that the thickness of a deposited layer (estimated by ellipsometry) does not depend on the substrate/solution contact time in the range from 2 min to 2 h. For electronic measurements, multilayer (GO/PAH)14 and (GO/PAN)30 films were grown on ITO in similar adsorption cycles. For comparison purposes, a GO colloid film (ca. 90 nm thick) was prepared by dip-coating the ITO/glass in the GO colloidal dispersion.