Modification of polyamide-CdS-CdSe composite material films with Ag using cation-cation exchange reaction.

Thin mixed CdSe-CdS-Ag2Se-Ag2S films were deposited on a polyamide 6 (PA) surface by successfully using a cation-exchange reaction between Cd2+ and Ag+ to convert CdSe-CdS into Ag2Se-Ag2S. These were deposited using a K2SeS2O6 precursor soln. at 60 °C followed by cadmium acetate (Cd(CH3COO)2). An aq. AgNO3 soln. was used as the Ag source. XRD patterns showed a complex PA-Cd-S-Se-Ag film cryst. compn. with CdS, CdSe, Ag2S and Ag2Se peaks. Calcd. dislocation d. ranged within 5-15 × 1013 lines·m-2 indicating high quality at. layers. Atomic Absorption Spectroscopy (AAS) showed five- to ten-fold excess of chalcogens to metals in the thin films formed. No chalcogenides were obsd. on the sample surface during XPS anal. after Ag exchange due to the desorption of CdS and CdSe layers, not diffused into the bulk of the polymer suggesting that silver chalcogenides were located subsurface, as opposed to the outermost layer, likely comprised of Ag2O. [on SciFinder(R)]