NDLI: Voltammetric and chronoamperometric studies of silver electrodeposition from a bath containing HEDTA

Content Provider	Springer Nature Link
Author	Oliveira, G. M. Silva, M. R. Carlos, Ivani Aparecida
Copyright Year	2007
Abstract	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$^{−1}$ M HEDTA, the deposited silver was reduced from a mixture of [AgHEDTA]$^{2−}$ and [Ag(NH$_{3}$)$_{2}$]$^{+}$ complexes, whereas at 2.0 × 10$^{−2}$ M and 2.0 × 10$^{−3}$ M HEDTA in the electrolyte, the silver was reduced from the [Ag(NH$_{3}$)$_{2}$]$^{+}$ 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$^{−1 }$M HEDTA at low overpotential (0.000 V to –0.050 V) showed a transition from progressive to instantaneous nucleation in a single current transient, whereas, at −0.200 V 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.
Starting Page	10164
Ending Page	10172
Page Count	9
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	42
Issue Number	24
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2007-09-25
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mechanics Crystallography Continuum Mechanics and Mechanics of Materials Polymer Sciences Characterization and Evaluation of Materials Materials Science
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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