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Book Chapter

Application of Langmuir-Blodgett Method for Preparing a Clay-Modified Electrode

By
Akihiko Yamagishi
Akihiko Yamagishi
Division of Biological Science Hokkaido University Sapporo 060, Japan
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Published:
January 01, 2002

Abstract

Since the pioneering work by Gosh and Bard discovering that the metal complexes adsorbed into a clay film were active electrochemically, many studies have been reported on the application of clay-modified electrodes (Gosh and Bard, 1983; Fitch et al., 1998). The following questions remain to be answered on the mechanisms of a clay modified electrode:

  • (1)

    How different an adsorbed state is between electrochemically active and inactive species in a film?

  • (2)

    How the layered structure of a clay film affects the mobility of a charge carrier?

In order to settle the above problems, it is helpful to prepare a film with the uniform orientation of a clay microcrystalline. It may also be important to study the diffusion process by controlling the thickness of a film on the level of the number of a clay layer. In most measurements, a clay film has been prepared by casting or spin-coating an aqueous clay suspension. Accordingly a film is a few micrometer thick, consisting of few hundred clay layers. It is not very clear how these layers are organized in a film and how the organization affects the generation of a charge carrier and its transportation process.

Although the classical Langmuir-Blodgett (LB) technique is a powerful approach to construct multilayer molecular assemblies (Gaines, 1966), the method unfortunately suffers from critical drawbacks such as mechanical weakness and sensitivity to contaminants. If a rigid inorganic layer is incorporated in such a LB film, however, it is expected that the film may acquire mechanical strength. Moreover the method

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Contents

Clay Minerals Society Workshop Lectures

Electrochemical Properties of Clays

Alanah Fitch
Alanah Fitch
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Clay Minerals Society
Volume
10
ISBN electronic:
9781881208303
Publication date:
January 01, 2002

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