Study of formation of azodioxy multilayers on gold surface by atomic force microscopy

U ovom radu ispitana je mogućnost nastajanja azodioksidnih višeslojeva na površini zlata (111) korištenjem polimerizacijskih svojstava aromatskih dinitrozo spojeva. Sintetiziran je 3-tiocijanatopropil-4-nitrozobenzoat koji se preko atoma sumpora iz tiocijanatne skupine može vezati na površinu zlata te je korišten za pripravu molekularnih jednoslojeva sa slobodnim nitrozo skupinama na međupovršini. Također je sintetizirano nekoliko aromatskih dinitrozo derivata s različitim premosnicama između benzenskih prstenova. Azodioksidni višeslojevi pripravljeni su uranjanjem modificiranog supstrata zlata (111), na koji je prethodno vezan 3- tiocijanatopropil-4-nitrozobenzoat, u otopinu odgovarajućeg aromatskog dinitrozo derivata poznate koncentracije na određeno vrijeme. Morfološke i topografske karakteristike molekularnih slojeva aromatskih nitrozo derivata na površini zlata (111) istražene su mikroskopijom atomskih sila (AFM). Rezultati ukazuju da se na slobodne nitrozo skupine izložene na međupovršini jednosloja veže nekoliko podjedinica aromatskih dinitrozo derivata.In this thesis, the possibility of the formation of azodioxide multilayers on the gold (111) surface was investigated by using the polymerization properties of aromatic dinitroso compounds. 3-Thiocyanatopropyl-4-nitrosobenzoate was synthesized, which can bind to the gold surface via sulfur atom from the thiocyanate group, and was used for preparation of molecular monolayers with free nitroso groups at the interface. Several aromatic dinitroso derivatives with different spacers between phenyl rings were also synthesized. Azodioxide multilayers were prepared by immersing a modified gold (111) substrate, to which 3-thiocyanatopropyl-4-nitrosobenzoate was previously adsorbed, in a solution of the corresponding aromatic dinitroso derivative of known concentration for a defined time. Morphological and topographical features of molecular layers of aromatic nitroso derivatives on the gold (111) surface were studied by atomic force microscopy (AFM). The results indicate that several subunits of aromatic dinitroso derivatives bind to free nitroso groups exposed at the monolayer interface