Gold electrodes with polyion multilayers and electrostatically bound redox couples

Self-assembled monolayers of alkane thiols with terminal ionized moieties readily adsorb polyions of the opposite charge to form a bilayer structure. A second polyion layer can be adsorbed electrostatically onto the first polyion layer to yield a trilayer. Ellipsometry suggests that the polyion laye...

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Bibliographic Details
Published in:Electrochimica acta 1997, Vol.42 (9), p.1325-1335
Main Authors: Lowy, D.A., Finklea, H.O.
Format: Article
Language:English
Subjects:
Analytical chemistry
bilayer
Chemistry
Electrochemistry
Electrodes: preparations and properties
Exact sciences and technology
General and physical chemistry
General, instrumentation
Ion selective electrodes
polyions
Self-assembled monolayer
trilayer
two-terminal sensor
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Summary:Self-assembled monolayers of alkane thiols with terminal ionized moieties readily adsorb polyions of the opposite charge to form a bilayer structure. A second polyion layer can be adsorbed electrostatically onto the first polyion layer to yield a trilayer. Ellipsometry suggests that the polyion layers have thicknesses comparable to that of the self-assembled monolayer. Each polyion layer can also electrostatically bind a redox couple, although only certain combinations of polyion and redox couple yield a stable redox wave. The reaction of ferroin and other iron complexes onto an anionic surface (monolayer or trilayer) leads to a pH-sensitive surface redox couple believed to be an oligomer of iron hydroxide. A two-terminal pH sensor of the type described by I. Rubinstein [1], and Hickman et al. Anals Chem 56, 1135 (1984). [2] is demonstrated using electrostatically bound redox couples.
ISSN:0013-4686
1873-3859
DOI:10.1016/S0013-4686(96)00269-1