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

卷:260

Article

Hromadka, Jiri^1,2  Tokay, Begum³  Correia, Ricardo¹  Morgan, Stephen P.¹  Korposh, Sergiy¹ 

[1] Univ Nottingham, Opt & Photon Grp, Fac Engn, Univ Pk, Nottingham NG7 2RD, England

[2] Charles Univ Prague, Fac Sci, Inst Environm Studies, Benatska 2, CZ-12843 Prague 2, Czech Republic

[3] Univ Nottingham, Fac Engn, Chem & Environm Engn Dept, Univ Pk, Nottingham NG7 2RD, England

关键词: Long period grating (LPG);    Metal organic framework (MOF);    ZIF-8;    Volatile organic compounds (VOCs) sensor;    Ethanol;    Methanol;    Acetone;   

DOI  :  10.1016/j.snb.2018.01.015

来源: Elsevier

【 摘 要 】

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. (C) 2018 The Authors. Published by Elsevier B.V.

【 授权许可】

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