Ruthenium(III) trichloride microcrystals were soaked in aniline and aniline/acetonitrile mixtures. In all cases, polyaniline (PANI) was formed as a result of the intercalation of aniline into the layered structure of RuCl 3 crystal and the reaction between aniline and the host material. The appearance of polyaniline was proven by infrared spectroscopy. The as-formed (PANI) x z+ (RuCl3) y z- nanocomposites were attached to gold surfaces and studied by cyclic electrochemical nanogravimetry. The sorption of aniline and its effect on the nanocomposites immobilized on gold were also studied in supporting electrolytes. The redox behaviour of the composite shows the electrochemical transformations of both polyaniline and RuCl3. The redox waves of PANI are similar to those observed for very thin PANI films. It attests that the response is originated from monolayer-like PANI film situated between RuCl3 layers. The transport of the charge-compensating ions reflects the variation of the oxidation states of both PANI and RuCl3. The nanocomposites behave as self-doped layers in the potential region when both constituents are charged, i.e. PANI is partially oxidized while RuCl3 is partially reduced, since the electroneutrality is assured by mutual charge compensation. When PANI is reduced, cations enter the layer to counterbalance the negative charge resulting from the reduction of Ru(III) to Ru(II). It was also found that the intercalation of water molecules is-albeit still substantial-smaller than that of pure RuCl3 microcrystals, which is related to the presence of PANI between the RuCl3 layers.
- Electrochemical quartz crystal microbalance
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Electrical and Electronic Engineering