Abstract
The use of silicon covered by silicon dioxide as a substrate for thin organic layers studied by a combination of electrical impedance measurements and ellipsometric measurements is described. This substrate is inert and the silicon-dioxide surface may be made hydrophobic or hydrophilic at will. Adsorption of organic molecules can be studied both electrically and optically. With doubleelectrode systems coverage and capacitance of the adsorbed monolayers may be measured separately. Surface potential may be measured provided the adsorbed layers are sufficiently insulating. Lipid monolayers may be established on the surface and their insulating properties measured. Further adsorption on the lipid monolayers may be studied as for example the influence of different drugs. Measurements on protein, peptide, and lipid monomolecular layers are presented.
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