Highly Sensitive Detection of Naphthalene in Solvent Vapor Using a Functionalized PBG Refractive Index Sensor

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2012
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Abstract
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.
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Authors Maiko Girschikofsky;Manuel Rosenberger;Stefan Belle;Malte Brutschy;Siegfried R. Waldvogel;Ralf Hellmann;Girschikofsky, Maiko;Rosenberger, Manuel;Belle, Stefan;Brutschy, Malte;Waldvogel, Siegfried R.;Hellmann, Ralf;
Journal sensors
Year 2012
DOI
10.3390/s120202018
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