6533b833fe1ef96bd129c9d4
RESEARCH PRODUCT
Functionalized planar Bragg grating sensor for the detection of BTX in solvent vapor
Maiko GirschikofskyM. RosenbergerMalte BrutschyRalf HellmannSiegfried R. WaldvogelS. Bellesubject
Materials sciencebusiness.industryXyleneAnalytical chemistryDip-coatingToluenechemistry.chemical_compoundPlanarOpticschemistryFiber Bragg gratingMoleculeBenzenebusinessRefractive indexdescription
We report on an optical planar Bragg grating evanescent wave refractive index sensor functionalized by a simple method against aromatic hydrocarbons such as benzene, toluene and xylene (BTX) in solvent vapor. To functionalize the sensor against BTX, substituted cyclodextrins are applied to the sensor surface using dip coating. Cyclodextrins have a hydrophobic cavity, which favors the accommodation of an organic molecule of appropriate dimensions leading to a non-covalent inclusion complex. The temporal sensor response reveals a multi-exponential rise towards an equilibrium state, whose level is found to be linearly related to the exposed analyte concentration. Taking into account the spectral resolution of the interrogation system we find a minimum concentration threshold of 200 ppm for benzene, 70 ppm for toluene and 20 ppm for m-xylene, respectively.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-04-23 | Optical Sensing and Detection II |