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RESEARCH PRODUCT

Low temperature plasma treatment of monomolecular Langmuir-Blodgett films

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Abstract The structure of the surface layer of materials is usually quite different from the bulk. Detailed information about the surface structure is often not available. This, together with the complex nature of low temperature plasma treatment, hinders the investigations of plasma chemical processes on solid surfaces. Monomolecular Langmuir-Blodgett (LB) structures offer a unique opportunity to prepare model surfaces with known thickness and molecular architecture. From the data obtained, the depth of the Ar plasma influence on solid organic surfaces was estimated to be about 400–1000 A depending on the nature of the surface layer. An oxygen plasma penetrates deeper with a penetration limit greater than 1000 A. Using plasma treatment, one can improve or regulate the properties of the LB structure, e.g. one can introduce new functionalities and improve thermostability. It is shown that by plasma treatment it is possible to prepare thin organoceramic films from metal- or silicon-containing LB films.