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MDPI, Sensors, 2(12), p. 2018-2025, 2012

DOI: 10.3390/s120202018

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

Journal article published in 2012 by Maiko Girschikofsky, Manuel Rosenberger, Stefan Belle, Malte Brutschy, Siegfried R. Waldvogel ORCID, Ralf Hellmann
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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.