Artigo
Electrochemical studies based on local interfacial ph changes of gold nanoparticles immobilized on polystyrene brushes
Registro en:
International Journal of Electrochemical Science. Belgrade: Esg, v. 8, n. 3, p. 4150-4159, 2013.
1452-3981
WOS:000316566700088
WOS000316566700088.pdf
7781282422851911
Autor
Antonio, Tamara R. T. A. [UNESP]
Basso, Caroline R. [UNESP]
Cabral, Murilo F.
Pedrosa, Valber A. [UNESP]
Resumen
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 and cations 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. Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) UNESP, Dept Chem & Biochem, Inst Biosci, Botucatu, SP, Brazil Univ Estadual Campinas, Dept Genet Evolut & Bioagents, Inst Biol, Campinas, SP, Brazil UNESP, Dept Chem & Biochem, Inst Biosci, Botucatu, SP, Brazil FAPESP: 10/07478-5