Chemical sensor based on a long-period fibre grating modified by a functionalized polydimethylsiloxane coating

Literature Information

Publication Date 2008-09-11
DOI 10.1039/B806129G
Impact Factor 4.616
Authors

Jack Barnes, Marian Dreher, Krista Plett, R. Stephen Brown, Cathleen M. Crudden, Hans-Peter Loock


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Abstract

A chemical sensor based on a coated long-period grating has been prepared and characterized. Designer coatings based on polydimethylsiloxane were prepared by the incorporation of diphenylsiloxane and titanium cross-linker in order to provide enhanced sensitivity for a variety of key environmental pollutants and optimal refractive index of the coating. Upon microextraction of the analyte into the polymer matrix, an increase in the refractive index of the coating resulted in a change in the attenuation spectrum of the long-period grating. The grating was interrogated using ring-down detection as a means to amplify the optical loss and to gain stability against misalignment and power fluctuations. Chemical differentiation of cyclohexane and xylene was achieved and a detection limit of 300 ppm of xylene vapour was realized.

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