Morphological stabilization and KPZ scaling by electrochemically induced co-deposition of nanostructured NiW alloy films

摘要: We have assessed the stabilizing role that induced co-deposition has in growth of nanostructured NiW alloy films by electrodeposition on polished steel substrates, under pulsed galvanostatic conditions. compared kinetic roughening properties with those Ni deposited same conditions, as Atomic Force Microscopy. The surface morphologies both systems are super-rough at short times, but differ long times: while a cauliflower-like structure dominates for Ni, surfaces display nodular morphology consistent more stable, conformal growth, whose height fluctuations Kardar-Parisi-Zhang universality class rough two-dimensional interfaces. These differences explained mechanisms controlling each case: mass transport through electrolyte (Ni) and attachment incoming species to growing interface (NiW). Thus, long-time regime is characteristic electrochemical current conditions which kinetics hindered due complex reaction mechanism. results agree theoretical model diffusion-limited systems, key parameter relative importance respect reaction.