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

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dc.contributor.authorWang, Tao
dc.contributor.authorYasukochi, Wataru
dc.contributor.authorKorposh, Sergiy
dc.contributor.authorJames, Stephen W.
dc.contributor.authorTatam, Ralph P.
dc.contributor.authorLee, Seung-Woo
dc.date.accessioned2016-07-05T08:02:44Z
dc.date.available2016-07-05T08:02:44Z
dc.date.issued2016-01-19
dc.description.abstractIn 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.en_UK
dc.identifier.citationTao Wang, Wataru Yasukochi, Sergiy Korposh, Stephen W. James, Ralph P. Tatam, Seung-Woo Lee, A long period grating optical fiber sensor with nano-assembled porphyrin layers for detecting ammonia gas, Sensors and Actuators B: Chemical, Volume 228, 2 June 2016, pp573-580en_UK
dc.identifier.cris3844240
dc.identifier.issn0925-4005
dc.identifier.urihttp://dx.doi.org/10.1016/j.snb.2016.01.058
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/10078
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-Non-Commercial-No Derivatives 3.0 Unported (CC BY-NC-ND 3.0). You are free to: Share — copy and redistribute the material in any medium or format. The licensor cannot revoke these freedoms as long as you follow the license terms. Under the following terms: Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. Information: Non-Commercial — You may not use the material for commercial purposes. No Derivatives — If you remix, transform, or build upon the material, you may not distribute the modified material. No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
dc.subjectLong period grating (LPG)en_UK
dc.subjectOptical fiberen_UK
dc.subjectPorphyrinen_UK
dc.subjectSelf-assemblyen_UK
dc.subjectAmmoniaen_UK
dc.subjectRefractive indexen_UK
dc.titleA long period grating optical fiber sensor with nano-assembled porphyrin layers for detecting ammonia gasen_UK
dc.typeArticleen_UK

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