Electrochemical studies based on local interfacial ph changes of gold nanoparticles immobilized on polystyrene brushes
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Data
2013-03-01
Autores
Antonio, Tamara R.T.A. [UNESP]
Basso, Caroline R. [UNESP]
Cabra, Murilo F.
Pedrosa, Valber A. [UNESP]
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Resumo
The electrochemical behavior of polystyrene modified with gold nanoparticle (Au NPs) was investigated in terms of pH-responsive polymer brush. A pH-responsive of modified polymer brush from tethered polystyrene was prepared and used for selective gating transport of anions andcations across the thin-film. An ITO-coated glass electrode was used as substrate and applied to study the switchable permeability of the polymer brush triggered by changes in pH of the aqueous environment. The pH-sensitive behavior of the polymer brush interface has been demonstrated by means of cyclic voltammetry (CV) and Localized Surface Plasmon Resonance (LSPR). CV experiments showed at ph values of 4 and 8 induces swelling and shrinking of the grafted polymer brushes, respectively, and this behavior is fast and reversible. LSPR measurements showed a blue shift of 33 nm in the surface resonance band changes by local pH. The paper brings an easy methodology to fabrication a variety of nanosensors based on the polymer brushes-nanoparticle assemblies. © 2013 by ESG.
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Palavras-chave
Gold nanoparticle, Local pH change, Polymer brushes, Stimuli-responsive materials
Como citar
International Journal of Electrochemical Science, v. 8, n. 3, p. 4150-4159, 2013.