Hydrogel fiber based on luminescent MOFs (Metal organic Frameworks), preparation method therefor and sensing device

Abstract

The invention discloses a hydrogel fiber based on luminescent MOFs, a preparation method therefor and a sensing device. The preparation method comprises the following steps of: uniformly mixing MOFs microcrystal grains into hydrogel precursors; injecting the hydrogel precursors into a coaxial double barrel; extruding a core-package structure cylinder with suitable size from the outlet of the barrel by an extrusion method or a biomaterial 3D printer; inserting one end of a common quartz fiber coaxially into the side core layer of the core-package structure cylinder; and obtaining the hydrogel fiber with a common fiber pigtail after curing. The sensing device comprises an excitation light source, a Y-type fiber, a delay fiber, a fiber connection, a hydrogel fiber, a long pass filter, a fluorescence spectrometer, and a signal processing unit. According to the overall technical scheme, high-selectivity fluorescence sensing of all-fiber can be constructed and realized, and in situ, real-time, remote and even living body fluorescence detection and sensing are realized, and the sensing applicability of the luminescent MOFs material is improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber fluorescence sensing, in particular to a hydrogel optical fiber based on MOFs, a preparation method and a sensing device thereof. Background technique [0002] Metal-Organic Frameworks (MOFs for short) is a new type of porous material formed by the self-assembly of organic ligands and metal nodes through coordination bonds. It has a large specific surface area and low cost. , catalytic luminescence, information storage and other fields have important application prospects. Luminescent MOFs materials based on lanthanide rare earth metals are an important class of ordered crystalline compounds, which can produce fluorescence under the action of external excitation light. Fluorescent MOFs materials have rich electronic structures and excellent photophysical properties (such as characteristic emission peaks Sharp, high luminous efficiency, etc.), has the advantages of fast detection speed, high...

AI Technical Summary

Problems solved by technology

Due to the uneven distribution and irregular movement of MOFs particles in the sample solution, and the fact that MOFs powder pellets are easily blown away by airflow in a gas environment, it will cause fluctuations in the intensity of the fluorescence spectrum, making the measurement inaccurate, and also causing fluorescence detection. Due to the short life of the material and the waste caused by the difficulty of recycling for secondary use, the researchers proposed to prepare MOFs thin films or composite films to realize the in-situ growth of MOFs particles on the surface of the carrier substrate or to construct composite films of MOFs particles and other materials. Overcome the application problems of inconvenient measurement and short life caused by the powder dispersion state of MOFs materials (such as existing invention patents 201710667152.0, 201511027933.0, 201610751719.8, etc.)

However, it is still a huge challenge to construct strong mechanical bonding, uniform and large-scale MOFs membranes required for industrialization and commercialization.

Secondly, sensors based on MOFs materials cannot be directly deployed in harsh and harsh real application environments, because fluorescence measurement requires a precise and reliable optical path to realize the introduction of excitation light and the collection of fluorescence. Most of the sensing demonstrations of MOFs materials are Relying on large-scale commercial fluorescence measurement equipment on the laboratory platform for off-line sampling measurement, this measurement method greatly limits the further realization of in-situ, in vivo, real-time and long-distance advanced sensing functions of luminescent MOFs materials

A solution with more application potential is based on MOFs material integrated optical fiber to realize fluorescence sensing. Ordinary optical fiber is used to effectively transmit laser light and collect fluorescent light, so that there is no need for precision optical paths of large instruments. Luminescent MOFs materials are grown or wrapped outside the cladding optical fiber. on the diameter (Sens. Actuators B: Chem. 2016, 232, 43-51), or on the outer diameter of a long period fiber grating (Sens. Actuators B: Chem. 2015, 221, 891-899), or on the fiber end face (Opt . Lett.2016, 41, 1696-1699), but these solutions still have application problems such as low light guide efficiency, weak mechanical bonding between luminescent MOFs materials and optical fibers, and MOFs mode materials are directly exposed to harsh environments and have short lifespan.

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