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Electrophoretic deposition of Ni(OH)2 nanoplatelets modified by polyelectrolyte multilayers: Study of the coatings formation in a laminar flow cell

AuthorsGonzález Granados, Zoilo ; Filiatre, C.; Buron, C.C.; Sánchez Herencia, Antonio Javier; Ferrari-Fernández, Begoña
KeywordsNickel Hydroxide
Layer-by-layer adsorption
Optical fixed-angle reflectometry
Polyelectrolyte Multilayer
Electrophoretic Deposition
Issue Date2017
PublisherElectrochemical Society
CitationJournal of the Electrochemical Society 164: D436- D444 (2017)
AbstractThe electrophoretic deposition (EPD) of semiconductor ceramic nanoplatelets functionalized by self-assembled polyelectrolyte multilayers has been investigated. The influence of particle surface modification in the packing of the nanostructured film on a nickel cathode has been determined for different electrical conditions. A polymer multilayer shell has been fashioned onto β-Ni(OH) nanoplatelets surfaces by alternating the adsorption of Polyethylenimine (PEI) and Polyacrylic Acid (PAA). Two different core-shell systems with 1, 3 and 5 layers were considered using either linear or branched PEI as polycation to alternate with the anionic polyelectrolyte (PAA). The Layer by Layer, (LbL) build-up of polyanions and polycations was characterized both in terms of particle zeta potential measurements and in situ measurements of polyelectrolyte adsorption onto a flat substrate by optical fixed-angle reflectometry. The amount of polyelectrolyte required to build up each layer was determined from zeta potential measurements. Both data allowed the design of the in situ formation of the core-shell nanostructures as well as the shaping of the particulated coatings following the one-pot procedure, avoiding intermediate steps of drying or washing. The movement of the core-shell particles, their aggregation state and the coating growth during electrophoretic deposition were studied in situ using a laminar flow cell coupled to an optical microscope. The particle flux was calculated from the surface coverage of the cathode and compared to the values estimated by the EPD electrokinetic model, demonstrating the strong impact of the steric interactions between the core-shell particles in both the deposition rate of nanoplatelets and the coating morphology.
Publisher version (URL)https://doi.org/10.1149/2.0801707jes
Identifiersdoi: 10.1149/2.0801707jes
e-issn: 1945-7111
issn: 0013-4651
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