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9 May 2012 Functionalized planar Bragg grating sensor for the detection of BTX in solvent vapor
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We report on an optical planar Bragg grating evanescent wave refractive index sensor functionalized by a simple method against aromatic hydrocarbons such as benzene, toluene and xylene (BTX) in solvent vapor. To functionalize the sensor against BTX, substituted cyclodextrins are applied to the sensor surface using dip coating. Cyclodextrins have a hydrophobic cavity, which favors the accommodation of an organic molecule of appropriate dimensions leading to a non-covalent inclusion complex. The temporal sensor response reveals a multi-exponential rise towards an equilibrium state, whose level is found to be linearly related to the exposed analyte concentration. Taking into account the spectral resolution of the interrogation system we find a minimum concentration threshold of 200 ppm for benzene, 70 ppm for toluene and 20 ppm for m-xylene, respectively.
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M. Girschikofsky, M. Rosenberger, S. Belle, M. Brutschy, S. R. Waldvogel, and R. Hellmann "Functionalized planar Bragg grating sensor for the detection of BTX in solvent vapor", Proc. SPIE 8439, Optical Sensing and Detection II, 843916 (9 May 2012);

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