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Sensors (Basel). 2012;12(2):2018-25. doi: 10.3390/s120202018. Epub 2012 Feb 13.

Highly sensitive detection of naphthalene in solvent vapor using a functionalized PBG refractive index sensor.

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  • 1University of Applied Sciences Aschaffenburg, Würzburger Strasse 45, D-63743 Aschaffenburg, Germany.


We report an optical refractive index sensor system based on a planar Bragg grating which is functionalized by substituted γ-cyclodextrin to determine low concentrations of naphthalene in solvent vapor. The sensor system exhibits a quasi-instantaneous shift of the Bragg wavelength and is therefore capable for online detection. The overall shift of the Bragg wavelength reveals a linear relationship to the analyte concentration with a gradient of 12.5 ± 1.5 pm/ppm. Due to the spectral resolution and repeatability of the interrogation system, this corresponds to acquisition steps of 80 ppb. Taking into account the experimentally detected signal noise a minimum detection limit of 0.48 ± 0.05 ppm is deduced.


Bragg grating; aromatic hydrocarbons; cyclodextrin; gas detection; optical sensor

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