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

Hromadka, Jiri; Tokay, Begum; Korposh, Sergiy; James, Stephen

Authors

Jiri Hromadka

Stephen James



Abstract

An optical fibre long period grating (LPG) modified with a thin film of ZIF-8, zeolitic immidazol framework material, a subgroup of metal organic framework (MOF) family, was employed for the detection of organic vapours. ZIF-8 film was deposited onto the surface of the LPG using in-situ crystallization technique by mixing freshly prepared 12.5 mM zinc nitrate hexahydrate and 25 mM of 2-metyl-imidazole solutions in methanol. ZIF-8 film was characterized by scanning electron microscope (SEM) images, thickness and refractive index (RI) has been calculated with use of ellipsometer for films containing of 1,2,3,5 and 10 growth cycles. The crystallinity of the film was confirmed by x-ray diffraction pattern (XRD). The LPG sensor 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 RI change induced by the penetration of the chemical molecules into the ZIF-8 pores. LPG modified with 2 and 5 growth cycles of ZIF-8 responded to exposure to methanol, ethanol, 2-propanol and acetone. The sensitivity of the measurements to humidity as an interfering parameter was also investigated.

Citation

Hromadka, J., Tokay, B., Korposh, S., & James, S. (2015). Optical fibre long period grating gas sensor modified with metal organic framework thin films. Sensors and Actuators B: Chemical, 221, https://doi.org/10.1016/j.snb.2015.07.027

Journal Article Type Article
Acceptance Date Jul 7, 2015
Online Publication Date Jul 9, 2015
Publication Date Dec 31, 2015
Deposit Date Sep 15, 2017
Publicly Available Date Sep 15, 2017
Journal Sensors and Actuators B: Chemical
Print ISSN 0925-4005
Electronic ISSN 0925-4005
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 221
DOI https://doi.org/10.1016/j.snb.2015.07.027
Keywords Long period grating (LPG); Metal organic framework (MOF); Zeolitic imidazolate framework (ZIF); ZIF-8; Organic vapour sensing
Public URL http://eprints.nottingham.ac.uk/id/eprint/46375
Publisher URL http://www.sciencedirect.com/science/article/pii/S0925400515300873
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
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