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An integrated optical Bragg grating refractometer for volatile organic compound detection

An integrated optical Bragg grating refractometer for volatile organic compound detection
An integrated optical Bragg grating refractometer for volatile organic compound detection
We report an integrated optical Bragg grating detector, fabricated using a direct UV-writing approach, that when coated with a thin-film of a hydrophobic siloxane co-polymer can perform as an all-optically accessed detector for hydrocarbon vapour. Upon exposure to a series of organic solvent vapours, both negative and positive Bragg wavelength shifts of differing magnitudes were measured. This was attributed to a combination of swelling and/or hydrocarbon solvent filling the free volume within the polymer film. A QSPR approach was utilised to create a multiple variable linear regression model, built from parameters that chemically described the hydrocarbons and the intermolecular interactions present between the co-polymer and hydrocarbon molecules. The resulting linear regression model indicated that the degree of swelling of the polysiloxane thin film when exposed to vapours of different hydrocarbons was due to the physico-chemical properties of the hydrocarbons and that this was the main causative factor of the measured Bragg wavelength shifts. Furthermore, this linear regression model allows for the prediction of the Bragg wavelength shift that would be measured upon exposure to vapours of another hydrocarbon. This detector is intrinsically safe in flammable environments, includes on-chip thermal compensation, operates at telecoms wavelengths and has a predictable response to a variety of hydrocarbons making it ideal for detection of flammable hydrocarbon vapours in industrial and domestic processes.
University of Southampton
WALES, DOMINIC J
c001ff27-d3ac-4d2e-859f-9e963fc0374c
Parker, Richard M.
06203881-5501-4b53-9789-e0db2d7daa88
Quainoo, Priscilla
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COOPER, PETER
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Gates, James
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Grossel, Martin
403bf3ff-6364-44e9-ab46-52d84c6f0d56
Smith, Peter
8979668a-8b7a-4838-9a74-1a7cfc6665f6
WALES, DOMINIC J
c001ff27-d3ac-4d2e-859f-9e963fc0374c
Parker, Richard M.
06203881-5501-4b53-9789-e0db2d7daa88
Quainoo, Priscilla
5ca05888-ad02-4949-92d6-07d4fa351a1b
COOPER, PETER
50a7bfaf-f22e-40a5-ba6c-a0bd6f385d80
Gates, James
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Grossel, Martin
403bf3ff-6364-44e9-ab46-52d84c6f0d56
Smith, Peter
8979668a-8b7a-4838-9a74-1a7cfc6665f6

WALES, DOMINIC J, Parker, Richard M., Quainoo, Priscilla, COOPER, PETER, Gates, James, Grossel, Martin and Smith, Peter (2016) An integrated optical Bragg grating refractometer for volatile organic compound detection. University of Southampton doi:10.5258/SOTON/384402 [Dataset]

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Abstract

We report an integrated optical Bragg grating detector, fabricated using a direct UV-writing approach, that when coated with a thin-film of a hydrophobic siloxane co-polymer can perform as an all-optically accessed detector for hydrocarbon vapour. Upon exposure to a series of organic solvent vapours, both negative and positive Bragg wavelength shifts of differing magnitudes were measured. This was attributed to a combination of swelling and/or hydrocarbon solvent filling the free volume within the polymer film. A QSPR approach was utilised to create a multiple variable linear regression model, built from parameters that chemically described the hydrocarbons and the intermolecular interactions present between the co-polymer and hydrocarbon molecules. The resulting linear regression model indicated that the degree of swelling of the polysiloxane thin film when exposed to vapours of different hydrocarbons was due to the physico-chemical properties of the hydrocarbons and that this was the main causative factor of the measured Bragg wavelength shifts. Furthermore, this linear regression model allows for the prediction of the Bragg wavelength shift that would be measured upon exposure to vapours of another hydrocarbon. This detector is intrinsically safe in flammable environments, includes on-chip thermal compensation, operates at telecoms wavelengths and has a predictable response to a variety of hydrocarbons making it ideal for detection of flammable hydrocarbon vapours in industrial and domestic processes.

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More information

Published date: 2016
Organisations: Molecular Assembly, Function & Structure, ORC Research, Optoelectronics Research Centre, Synthetic Chemistry Group, Faculty of Physical Sciences and Engineering, Photonic Systems Circuits & Sensors, Registrar & University Executive

Identifiers

Local EPrints ID: 384402
URI: https://eprints.soton.ac.uk/id/eprint/384402
PURE UUID: 6eca4630-daf8-4c07-9bc1-7e99ae5dc42c
ORCID for James Gates: ORCID iD orcid.org/0000-0001-8671-5987
ORCID for Martin Grossel: ORCID iD orcid.org/0000-0001-7469-6854

Catalogue record

Date deposited: 01 Feb 2016 16:08
Last modified: 06 Jun 2018 13:09

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Contributors

Creator: DOMINIC J WALES
Creator: Richard M. Parker
Creator: Priscilla Quainoo
Creator: PETER COOPER
Creator: James Gates ORCID iD
Creator: Martin Grossel ORCID iD
Creator: Peter Smith

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