Optical fibre long period grating gas sensor modified with metal organic framework thin films

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dc.contributor.authorHromadka, Jiri
dc.contributor.authorTokay, Begum
dc.contributor.authorJames, Stephen W.
dc.contributor.authorTatam, Ralph P.
dc.contributor.authorKorposh, Sergiy
dc.date.accessioned2016-04-20T11:37:23Z
dc.date.available2016-04-20T11:37:23Z
dc.date.issued2015-07-09
dc.description.abstractAn optical fibre long period grating (LPG) modified with a thin film of ZIF-8, a zeolitic immidazol framework material and a subgroup of metal organic framework family, was employed for the detection of organic vapours. ZIF-8 films were deposited onto the surface of the LPG using an in-situ crystallization technique by mixing freshly prepared 12.5 mM zinc nitrate hexahydrate and 25 mM 2-metyl-imidazole solutions in methanol. The ZIF-8 film was characterized by scanning electron microscopy. The thickness and refractive index (RI) of films deposited after 1,2,3,5 and 10 growth cycles were determined by using an ellipsometer. The crystallinity of the films was confirmed by X-ray diffraction pattern. The LPG was designed to operate at the phase matching turning point to provide the highest sensitivity. The sensing mechanism is based on the measurement of the change in the RI of the film induced by the penetration of the chemical molecules into the ZIF-8 pores. The responses of LPGs modified with 2 and 5 growth cycles of ZIF-8 to exposure to methanol, ethanol, 2-propanol and acetone were characterised. The sensitivity of the measurements to humidity as an interfering parameter was also investigated.en_UK
dc.identifier.citationJiri Hromadka, Begum Tokay, Stephen James, Ralph P. Tatam, Sergiy Korposh, Optical fibre long period grating gas sensor modified with metal organic framework thin films, Sensors and Actuators B: Chemical, Volume 221, 31 December 2015, Pages 891-899en_UK
dc.identifier.issn0925-4005
dc.identifier.urihttp://dx.doi.org/10.1016/j.snb.2015.07.027
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/9834
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsUnder a Creative Commons license Attribution 4.0 International (CC BY 4.0) You are free to: Share — copy and redistribute the material in any medium or format, Adapt — remix, transform, and build upon the material for any purpose, even commercially. 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: No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.en_UK
dc.subjectLong period gratingen_UK
dc.subjectLPGen_UK
dc.subjectMetal organic frameworken_UK
dc.subjectMOFen_UK
dc.subjectZeolitic imidazolate frameworken_UK
dc.subjectZIFen_UK
dc.subjectZIF-8en_UK
dc.subjectOrganic vapour sensingen_UK
dc.titleOptical fibre long period grating gas sensor modified with metal organic framework thin filmsen_UK
dc.typeArticleen_UK

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