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Polymer multilayer film formation studied by in situ ellipsometry and electrochemistry

Haberska, Karolina ; Ruzgas, Tautgirdas

Bioelectrochemistry (Amsterdam, Netherlands), 2009-09, Vol.76 (1), p.153-161 [Periódico revisado por pares]

Netherlands: Elsevier B.V

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Título:
Polymer multilayer film formation studied by in situ ellipsometry and electrochemistry
Autor: Haberska, Karolina ; Ruzgas, Tautgirdas
Assuntos: Adsorption ; Analytical Chemistry ; Analytisk kemi ; Carboxymethylcellulose Sodium - chemistry ; Chemical Sciences ; Chitosan - chemistry ; Diffusion ; Electric Impedance ; Electrochemistry ; Electrolytes - chemistry ; Gold - chemistry ; Kemi ; Layer-by-Layer ; Membrane model ; Natural Sciences ; Naturvetenskap ; Oxidation-Reduction ; Pinhole model ; Polyelectrolyte multilayers ; Polymers - chemistry ; Self assembly ; Surface Properties
É parte de: Bioelectrochemistry (Amsterdam, Netherlands), 2009-09, Vol.76 (1), p.153-161
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Polyelectrolyte multilayer films adsorbed on gold surfaces were studied by combined ellipsometric and electrochemical methods. Multilayers were composed of “synthetic” (poly(4-styrenesulfonic acid) ammonium salt (PSS) and poly(allylamine hydrochloride) (PAH) (PSS/PAH)) and “semi-natural” (carboxymethyl cellulose (CMC) and chitosan (CHI) (CMC/CHI)) polyelectrolytes. It was found that only PSS/PAH Layer-by-Layer (LbL) assembled structures result in dense surface confined films that limit permeability of small molecules, such as ferri-/ferrocyanide. The PSS/PAH assemblies can be envisaged as films with pinholes, through which small molecules diffuse. During the LbL deposition process of these films a number of pinholes quickly decay. A representative pinhole diameter was found to be approximately 20 μm, which determines the diffusion of small molecules through LbL films, and yet remains constant when the film consists of a few LbL assembled polyelectrolyte bilayers. CMC/CHI LbL assemblies at gold electrode surfaces give very low density films, which do not limit the diffusion of ferri-/ferrocyanide between the surface of the electrode and the solution.
Editor: Netherlands: Elsevier B.V
Idioma: Inglês

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Polymer multilayer film formation studied by in situ ellipsometry and electrochemistry

Haberska, Karolina ; Ruzgas, Tautgirdas

Netherlands: Elsevier B.V

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