Investigation of ultrathin organic films on metal surfaces using electrochemical and polarization modulation infrared spectroscopic techniques

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The main objective of the proposed research is to determine the influence of the electric charge and the composition of electrolyte on the orientation, surface coordination, conformation and the long range order of organic molecules that are adsorbed at metal electrolyte interfaces. Regardless whether monolayers of these molecules, called corrosion inhibitors, or thick layers of protective paints are used, the interaction between the first layer of the film and the metal surface determines the protective functions of these barrier materials. Thus, the focus of the proposed study is on the investigation of behaviour of ultrathin films such as monolayers. Most corrosion inhibitors used today were developed by empirical approach and studied using macroscopic techniques such as impedance analysis that probe only the bulk properties of these materials. The proposed research will complement and enrich existing knowledge on a truly molecular level. Application of a newly developed infrared technique (Polarization Modulation Infrared Reflection Absorption Spectroscopy) will allow us to extract quantitative information regarding orientation of the individual functional groups of molecules in monolayers of protective coatings. The proposed research is important for the protection of the environment and construction materials against corrosion, especially in the petrochemical and power generating industries where corrosion inhibitors are extensively used. It will also provide an understanding of the adhesion properties of protective paint coatings in the automobile and construction industries. Finally, but perhaps most importantly, this work will contribute to the basic research that is aimed at developing a thorough knowledge of the interaction of molecules with interfaces. Such research is pivotal for the further advancement of microelectronics and the emerging field of nanotechnology.