A preparation method and product of an electrospun fiber membrane with copper ion responsiveness, and a method for detecting copper ions using the same

Abstract

The invention relates to a preparation method and product of an electrospun fiber membrane with copper ion responsiveness and a method for detecting copper ions by using the same, and belongs to the technical field of detection. The invention uses the electrospinning method to prepare the electrospinning fiber membrane. In the preparation process, 2,6-pyridinedicarboxylic acid and europium coordination polymer particles are used as raw materials, and the existence between 2,6-pyridinedicarboxylic acid and europium ions is used. Antenna effect, resulting in red fluorescence. When copper ions are introduced, 2,6-picolinic acid forms a complex with copper ions, resulting in the blocking of the antenna effect between 2,6-picolinic acid and europium ions, As a result, the fluorescence was quenched, and the electrospun fiber membrane with copper ion responsiveness was finally prepared. And by uniformly attaching a circular cover glass on the surface of the aluminum foil covered on the electrospinning drum receiving device, the final prepared electrospun fiber membrane is attached to the circular cover glass to directly form a circular shape of a specific size. The membrane overcomes the defects caused by punching or cutting, and ensures the sensing performance of the membrane and the accuracy of the final detection result.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a preparation method and product of an electrospun fiber membrane with copper ion responsiveness and a method for detecting copper ions using the same. Background technique [0002] Visual analysis techniques have attracted much attention due to their convenience, speed, and ease of observation with the naked eye, and they can be directly read by UV-visible spectrophotometers or fluorescence spectrophotometers. The two most classic visualization analysis methods are colorimetric analysis and fluorescence analysis, which have the advantages of no radioactivity, no need for large and expensive instruments, high detection sensitivity, and high spatiotemporal resolution. With the rapid development of analytical science and point-of-care testing (POCT), it is a good choice to load visualized signal probes on solid-phase carriers to form a visualized solid-phase sensing p...

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Problems solved by technology

However, in terms of the receiving device of the electrospun fiber sensing membrane, there are the following disadvantages: (1) The traditional aluminum foil is directly used as the receiving substrate of the electrospun membrane, and the obtained electrospun fiber membrane has a large area, which needs to be punched through small holes. The small discs are obtained by punching holes with a device (about 6mm in diameter). The punching process will cause fouling to the effective sensing area of ​​the film. If other cutting methods are used, the sensing cross-section of each batch of films cannot be guaranteed to be consistent. It will affect the accuracy of the final test results; (2) The substrate based on aluminum foil is relatively soft, and it is easy to wrinkle and inconvenient to handle in subsequent analysis and testing; (3) Aluminum foil is used as the substrate, so Aluminum is amphoteric. In subsequent sensing experiments, if an acidic or alkaline solution is used, the aluminum foil substrate will be dissolved, and the dissolved impurities will have a serious impact on the entire sensing system; (4) In terms of fluorescence analysis, For non-circular (diameter 6mm) electrospun fiber membranes, it is troublesome to pick up and collect fluorescent sensing signals, and special fixing brackets are required

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