caa a22 4500 463227867 CHVBK 20180405153232.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s10853-007-2102-z doi (NATIONALLICENCE)springer-10.1007/s10853-007-2102-z Voltammetric and chronoamperometric studies of silver electrodeposition from a bath containing HEDTA [Elektronische Daten] [G. de Oliveira, M. Silva, Ivani Carlos] The electrodeposition of silver on platinum from ammonium-buffered solutions containing HEDTA (N-(2-hydroxyethyl)ethylenediaminetriacetic acid) at various concentrations was investigated. Potentiometric titration and voltammetric studies indicated that in the presence of 2.0×10−1M HEDTA, the deposited silver was reduced from a mixture of [AgHEDTA]2− and [Ag(NH3)2]+ complexes, whereas at 2.0×10−2M and 2.0×10−3M HEDTA in the electrolyte, the silver was reduced from the [Ag(NH3)2]+ complexes alone. Hydrodynamic studies showed variation in the diffusion coefficient for the electroactive species in solution, depending on the HEDTA concentration. Chronoamperometric study in a solution containing 2.0×10−1M HEDTA at low overpotential (0.000V to -0.050V) showed a transition from progressive to instantaneous nucleation in a single current transient, whereas, at −0.200V only 3D-progressive nucleation controlled by mass transport was observed. Scanning electron microscope images showed that the silver films produced in silver baths with HEDTA were uniform, without cracks, and fine-grained, regardless of its concentration, while in the absence of HEDTA the morphology was rough and dendritic. X-ray diffraction analysis of the films obtained at various HEDTA concentrations revealed polycrystalline silver, similar to film obtained in cyanide and EDTA/ammonia baths. Springer Science+Business Media, LLC, 2007 de Oliveira G. Departamento de Química, Universidade Federal de São Carlos, CP 676, 13565-905, Sao Carlos, SP, Brazil aut Silva M. Departamento de Química, Universidade Federal de São Carlos, CP 676, 13565-905, Sao Carlos, SP, Brazil aut Carlos Ivani Departamento de Química, Universidade Federal de São Carlos, CP 676, 13565-905, Sao Carlos, SP, Brazil aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/24(2007-12-01), 10164-10172 0022-2461 42:24<10164 2007 42 10853 https://doi.org/10.1007/s10853-007-2102-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-2102-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- de Oliveira G. Departamento de Química, Universidade Federal de São Carlos, CP 676, 13565-905, Sao Carlos, SP, Brazil aut NATIONALLICENCE 700 1- Silva M. Departamento de Química, Universidade Federal de São Carlos, CP 676, 13565-905, Sao Carlos, SP, Brazil aut NATIONALLICENCE 700 1- Carlos Ivani Departamento de Química, Universidade Federal de São Carlos, CP 676, 13565-905, Sao Carlos, SP, Brazil aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/24(2007-12-01), 10164-10172 0022-2461 42:24<10164 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer