Anodic sulphuration of submicron-grained thin films for IR sensing

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.