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Sensors 2012, 12(2), 2018-2025; doi:10.3390/s120202018

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

1
University of Applied Sciences Aschaffenburg, Würzburger Straße 45, D-63743 Aschaffenburg, Germany
2
Institute of Organic Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
*
Author to whom correspondence should be addressed.
Received: 12 December 2011 / Revised: 3 February 2012 / Accepted: 3 February 2012 / Published: 13 February 2012
(This article belongs to the Section Chemical Sensors)
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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. View Full-Text
Keywords: gas detection; optical sensor; Bragg grating; cyclodextrin; aromatic hydrocarbons gas detection; optical sensor; Bragg grating; cyclodextrin; aromatic hydrocarbons
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Girschikofsky, M.; Rosenberger, M.; Belle, S.; Brutschy, M.; Waldvogel, S.R.; Hellmann, R. Highly Sensitive Detection of Naphthalene in Solvent Vapor Using a Functionalized PBG Refractive Index Sensor. Sensors 2012, 12, 2018-2025.

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