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

Abstract

a b s t r a c tAn 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.

A silver nanoparticle-anchored UiO-66(Zr) metal–organic framework (MOF)-based capacitive H2S gas sensor

“…29 Owing to the above fascinating features, UiO-66 (Zr) can be used as promising materials for the gas sensing study. Various transduction mechanism such as optical, 30 thermal, 31 magnetic, 32 surface acoustic wave guide (SAW), 33 resistance, 34 resonance, 35 and capacitive 4, [24][25][26] have been employed for the detection of target gaseous analytes. Among them, interdigitated electrode (IDE) capacitive transducer is one of the most investigated technique owing to its miniature size, low-cost, low temperature independence, easy to integrate with read circuits, and high sensing performances features.…”

A Comparative Study of Interdigitated Electrode and Quartz Crystal Microbalance Transduction Techniques for Metal–Organic Framework-Based Acetone Sensors

“…Sensors based on various transduction mechanisms, such as resistive- [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ], capacitive- [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ], optical- [ 26 , 27 , 28 , 29 ], magnetic- [ 30 ], thermal- [ 31 ], microwave- [ 32 , 33 ], and resonance-based [ 34 , 35 , 36 , 37 , 38 , 39 ] techniques, have been applied for detecting a target analyte. Among these sensors, interdigitated electrode (IDE) capacitors and quartz crystal microbalances (QCMs) are the most used because of their small size, low cost, and high sensitivity.…”

Novel Fiber Grating for Sensing Applications

“…To sum up, optical fiber grating sensors have experienced fast development in the past decades due to their advantages of flexible structure, rapid response, miniaturization, and immunity to electromagnetic interference. There is no doubt that the application fields of optical fiber grating sensors can be further enlarged by combining some novel sensing principles, introducing sensitive materials, or designing more new structures in grating …”