“…146 Clem The quality of shape replication depends strongly on the site selectivity with which material is deposited on different surfaces, which in turn depends on the chemical contrast between alternate regions of the substrate. 149,150 Instead of OTS, hydrophilic 11-mercapto-undecanol (HS-C 11 H 22 -OH) SAMs have been printed on gold, while the rest of the substrate was covered with a hydrophobic octadecanethiol (C 18 H 35 -SH) SAM. 151 The thiol groups bind covalently to the gold surface, so that methyl and hydroxyl groups point outward from the surface.…”