Highly sensitive volatile organic compounds vapour measurements using a long period grating optical fibre sensor coated with metal organic framework ZIF-8

Hromadka, Jiri; Tokay, Begum; Correia, Ricardo; Morgan, Stephen P.; Korposh, Sergiy

Abstract

An optical fibre long period grating (LPG) based volatile organic compound (VOC) sensor coated with ZIF-8, a material from the zeolite imidazolate framework (ZIF) family, functional coating is presented. ZIF-8 film was 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. A concentration specific response to acetone, ethanol and methanol vapour was obtained over the high concentration range up to tens thousands ppm. The LPG based sensor works at phase-matching turning point (PMTP) and such operates at the highest sensitivity. A novel approach for the data analysis based on the measurement of the bandwidth of the U-shaped attenuation band of the LPG is introduced. The optimized sensor shows a sensitivity of 0.015 ± 0.001 and 0.018 ± 0.0015 nm/ppm and limit of detection (LOD) of 6.67 and 5.56 ppm for acetone and ethanol respectively.

Citation

Hromadka, J., Tokay, B., Correia, R., Morgan, S. P., & Korposh, S. (2018). Highly sensitive volatile organic compounds vapour measurements using a long period grating optical fibre sensor coated with metal organic framework ZIF-8. Sensors and Actuators B: Chemical, 260, https://doi.org/10.1016/j.snb.2018.01.015

• Journal Article Type: Article
• Acceptance Date: Jan 2, 2018
• Online Publication Date: Jan 3, 2018
• Publication Date: May 1, 2018
• Deposit Date: Feb 6, 2018
• Publicly Available Date: Feb 6, 2018
• Journal: Sensors and Actuators B: Chemical
• Print ISSN: 0925-4005
• Electronic ISSN: 0925-4005
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 260
• DOI: https://doi.org/10.1016/j.snb.2018.01.015
• Keywords: Long period grating (LPG); Metal organic framework (MOF); ZIF-8; Volatile organic compounds (VOCs) sensor; Ethanol; Methanol; Acetone
• Public URL: https://nottingham-repository.worktribe.com/output/930704
• Publisher URL: https://doi.org/10.1016/j.snb.2018.01.015