Abstract
Since hydrogen-terminated Si surface has hydrophobicity, it is expected that adsorbed monomolecular film of surfactant will be formed on the Si surface in aqueous solution containing the surfactant. Such an adsorbed monolayer film is very effective for the development of a functional electrode. In this study, we have investigated the state of adsorption about an aerosol OT as the monolayer on the electrode surface and its orientation with hydrogen-terminated Si(111) surface by in situ ATR-FTIR spectroscopy. At this time, in situ observation performed while imposing bias to the electrode. The results suggested that the aerosol OT were desorbed by the oxidation of back-bonds in the Si atoms on the electrode surface under the imposing noble potential, although no change was observed especially when imposing less-noble potential.
Highlights
Functional materials have been developed by modifying organic monolayer onto material surfaces such as metals or semiconductors, etc., and to apply them as various functional surfaces
We have investigated the state of adsorption about an aerosol OT as the monolayer on the electrode surface and its orientation with hydrogen-terminated Si(111) surface by in situ ATR-FTIR spectroscopy
The results suggested that the aerosol OT were desorbed by the oxidation of back-bonds in the Si atoms on the electrode surface under the imposing noble potential, no change was observed especially when imposing less-noble potential
Summary
Functional materials have been developed by modifying organic monolayer onto material surfaces such as metals or semiconductors, etc., and to apply them as various functional surfaces. In these fields, the researches on electronics and novel materials using self-assembled monolayers (SAM) are actively studied, and many interesting results are reported [1]-[6]. Utilization of a surfactant solution to the Si substrate allows self-assembly of monolayer at the solid-liquid interface due to the interaction between the hydrophobicity of the H-terminated Si surface and the hydrophobic portion of the alkyl chain of the surfactant. This is called SAM film, which spontaneously generates a structure according to the properties unique to atoms or molecules, so that it would be possible to precisely manipulate and control atoms. In this study, we investigated in detail the adsorption monolayer of double-stranded surfactant using in situ ATR-FTIR
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