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A long period grating optical fiber sensor with nano-assembled porphyrin layers for detecting ammonia gas

Wang, Tao; Yasukochi, Wataru; Korposh, Sergiy; James, Stephen W.; Tatam, Ralph P.; Lee, Seung-Woo

Authors

Tao Wang

Wataru Yasukochi

Stephen W. James

Ralph P. Tatam

Seung-Woo Lee



Abstract

In this study, the ability of a long period grating (LPG) optical fiber sensor coated with a multilayer film of poly(diallyldimethyammonium chloride) (PDDA) and tetrakis(4-sulfophenyl)porphine (TSPP) to detect ammonia gas was demonstrated. The nano-assembled thin film was prepared using a layer-by-layer deposition technique. This combination of an LPG and TSPP could allow highly sensitive optical sensors that specifically bind ammonia to be fabricated. An LPG with a period of 100 μm and a PDDA/TSPP coating produced by depositing fifteen layers afforded a limit of detection of 0.67 ppm for ammonia gas. TSPP molecules in the film acted as ammonia receptors because the TSPP morphologically changed from J- or H-aggregates to free base monomers when it was deprotonated by being exposed to ammonia. Interestingly, HCl vapor could be used to increase the relative amount of J-aggregation in the TSPP and to restore the sensor response. The reversibility of the morphological change in the TSPP allowed reversible changes to occur in the properties of the coating, including the refractive index, film thickness and density, and electrostatic interactions; these influenced the transmission spectrum of the LPG.

Citation

Wang, T., Yasukochi, W., Korposh, S., James, S. W., Tatam, R. P., & Lee, S. (2016). A long period grating optical fiber sensor with nano-assembled porphyrin layers for detecting ammonia gas. Sensors and Actuators B: Chemical, 228, https://doi.org/10.1016/j.snb.2016.01.058

Journal Article Type Article
Acceptance Date Jan 14, 2016
Online Publication Date Jan 19, 2016
Publication Date Jun 2, 2016
Deposit Date Jul 21, 2016
Publicly Available Date Jul 21, 2016
Journal Sensors and Actuators B: Chemical
Print ISSN 0925-4005
Electronic ISSN 0925-4005
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 228
DOI https://doi.org/10.1016/j.snb.2016.01.058
Keywords Long period grating (LPG); Optical fiber; Porphyrin; Self-assembly; Ammonia; Refractive index
Public URL http://eprints.nottingham.ac.uk/id/eprint/35255
Publisher URL http://dx.doi.org/10.1016/j.snb.2016.01.058
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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