FESEM images shows a monolayer of reasonably well isolated gold nanoparticles on 4-ATP and APT-400, small aggregates is observed for APT-600 and APT-1k. (Fig. ) In case of APT-10k, the gold nanoparticles were found to form multilayers, resulting in semi-continuous nanoparticulate films, which could explain the high values of surface coverage measured by the QCM.