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

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dc.contributor.author Wang, Tao
dc.contributor.author Yasukochi, Wataru
dc.contributor.author Korposh, Sergiy
dc.contributor.author James, Stephen W.
dc.contributor.author Tatam, Ralph P.
dc.contributor.author Lee, Seung-Woo
dc.date.accessioned 2016-07-05T08:02:44Z
dc.date.available 2016-07-05T08:02:44Z
dc.date.issued 2016-01-19
dc.identifier.citation Tao 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, pp573-580 en_UK
dc.identifier.issn 0925-4005
dc.identifier.uri http://dx.doi.org/10.1016/j.snb.2016.01.058
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/10078
dc.description.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. en_UK
dc.language.iso en en_UK
dc.publisher Elsevier en_UK
dc.rights Attribution-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.subject Long period grating (LPG) en_UK
dc.subject Optical fiber en_UK
dc.subject Porphyrin en_UK
dc.subject Self-assembly en_UK
dc.subject Ammonia en_UK
dc.subject Refractive index en_UK
dc.title A long period grating optical fiber sensor with nano-assembled porphyrin layers for detecting ammonia gas en_UK
dc.type Article en_UK

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