25 April 2012 Novel block copolymers for multi-agent detection using polymer optical fibers
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A novel block copolymer material is applied successfully to a low cost Polymer Optical Fiber- POF for sensing applications. The copolymer consists of two blocks, one hydrophilic and sensitive to polar substances and the other hydrophobic and sensitive to hydrocarbons. Prediction of polymer's behavior in the presence of analytes has been successfully verified experimentally. The existence of two different blocks allows for the detection of a wide variety of agents and this response could be further engineered and enhanced by suitable adjusting the ratio of the two blocks. Using methanol as polymer's solvent PMMA POF successfully coated without deteriorating its properties. Functionalized U-bent POFs were employed as sensing tips overcladded with the sensitive material using a simple dip coating technique. Due to material's high transition temperature (well above 120°degC) the overlayers were very stable and environmentally robust. The developed sensors characterized and exhibited very fast response in ammonia, humidity, toluene and benzene, with full operational reversibility.
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Loukas Athanasekos, Loukas Athanasekos, Stergios Pispas, Stergios Pispas, Christos Riziotis, Christos Riziotis, "Novel block copolymers for multi-agent detection using polymer optical fibers", Proc. SPIE 8426, Microstructured and Specialty Optical Fibres, 842615 (25 April 2012); doi: 10.1117/12.927086; https://doi.org/10.1117/12.927086

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