Resumen

MAIOCO, S  y  ARAGON, R. Anodic sulphuration of submicron-grained thin films for IR sensing. An. Asoc. Quím. Argent. [online]. 2005, vol.93, n.1-3, pp.51-55. ISSN 0365-0375.

Equilibrium and kinetic properties of the anodic sulphuration of magnetron sputtered lead thin films at room temperature are reviewed. Tafel plots and cyclic voltametry data demonstrate the existence of competing two electron reactions. Direct anodization produces PbS of 8 nm average grain size (Scherrer), whereas a solution-reprecipitation mechanism induces coarser deposits. PbS₂ contamination can be minimized by controlling pH and the anodic potential. Optimized working conditions were found for 0.2 M thioacetamide solutions, at a buffered pH of 4.6 and a working potential of 0.600 V, with respect to the Ag/AgCl reference electrode.