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We report on an optical sensor system, which is highly sensitive to small traces of arenes in solvent vapour. The sensor system is based on a planar Bragg grating refractive index sensor which is sensitised towards arenes by applying a thin layer of substituted α-cyclodextrins to the sensor surface by dip coating. In our studies using benzene as a representative of arenes, the dependence of the spectral shift of the reflected Bragg wavelength on variation of the benzene concentration was found to 8 pm/100 ppm. Considering the spectral resolution of the interrogation system with reliable signal identification, this leads to a minimum detectable benzene concentration of 75 ppm.

7.5.1 α-Cyclodextrin Functionalized Planar Bragg Grating Sensor for the Detection of Small Arene Traces in Solvent Vapour