Palladium Nanoparticles Embedded in a Layer-by-Layer Nanoreactor Built with Poly(Acrylic Acid) Using "electro-Click Chemistry"

Palladium nanoparticles (Pd NPs) were formed by electrochemical reduction of Pd(NH3)43+ ions entrapped by ion exchange in poly(acrylic acid) (PAA) multilayer films grown by the Sharpless "click reaction." The alkyne (PAAalk) and azide (PAAaz) groups were covalently bound to the PAA, and th...

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Detalles Bibliográficos
Autores principales: Villalba, Matias Ariel, Bossi, Mariano Luis, Calvo, Ernesto Julio
Publicado: 2016
Materias:
Absorption spectroscopy
Carboxylic acids
Copper
Cyclic voltammetry
Electrolytic reduction
Gold
Ion exchange
Multilayer films
Multilayers
Nanoparticles
Nanoreactors
Organic acids
Polyethylenes
Quartz crystal microbalances
Reduction
Scanning electron microscopy
Cathodic direction
ELectrochemical methods
Electrochemical quartz crystal microbalance
Electrochemical reductions
Palladium nanoparticles
Polarization modulation infrared reflection absorption spectroscopy
Poly(acrylic acid )
Polyacrylic acids
Palladium
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v32_n27_p6836_Villalba
http://hdl.handle.net/20.500.12110/paper_07437463_v32_n27_p6836_Villalba
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:Palladium nanoparticles (Pd NPs) were formed by electrochemical reduction of Pd(NH3)43+ ions entrapped by ion exchange in poly(acrylic acid) (PAA) multilayer films grown by the Sharpless "click reaction." The alkyne (PAAalk) and azide (PAAaz) groups were covalently bound to the PAA, and the catalyzed buildup of the multilayer film was performed by electrochemical reduction of Cu2+ to Cu+. The size of the Pd NPs formed in Au/(PAAalk)3(PAAaz)2 multilayer films by the click reaction, that is, 50 nm, is larger than that of similar Pd NPs formed in electrostatically bound Au/(PAA)3(PAH)2 nanoreactors, that is, 6-9 nm, under similar conditions. A combination of electrochemical methods and electrochemical quartz crystal microbalance, polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS), ellipsometry, and scanning electron microscopy has been used to follow these processes. Cyclic voltammetry of the resulting Pd NPs in a 0.1 M H2SO4 solution at 0.1 V·s-1 shows the PdO reduction peak at the same potential as that on the clean Pd surface unlike the NPs formed in electrostatically self-assembled Au/(PAA)3(PAH)2 nanoreactors with a 0.2 V shift in the cathodic direction most probably because of the strong adsorption of amino groups on the Pd NP surfaces. © 2016 American Chemical Society.

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