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Core-shell type ultra-micro electrode prepared through coaxial electrostatic spinning and preparation method thereof

A technology of coaxial electrospinning and ultra-micro electrodes, which is applied in separation methods, filament/wire forming, chemical instruments and methods, etc., can solve the problems that the ablation process is not easy to control, and avoid the process of electrode surface modification, The effect of a wide range of options and a simple preparation method

Inactive Publication Date: 2016-03-09
JIANGXI SCI & TECH NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the use of ultra-fine carbon fibers can be used to prepare ultra-micro electrodes with a diameter of 100nm, the ablation process is not easy to control, and the surface of carbon fiber electrodes is chemically inert, which requires further treatment to improve the surface adhesion.

Method used

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  • Core-shell type ultra-micro electrode prepared through coaxial electrostatic spinning and preparation method thereof
  • Core-shell type ultra-micro electrode prepared through coaxial electrostatic spinning and preparation method thereof
  • Core-shell type ultra-micro electrode prepared through coaxial electrostatic spinning and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The ATP sensor prepared in this example has a core-shell double-layer structure; the core layer is composed of polyvinylpyrrolidone (PVP) and graphite powder, and the shell layer is composed of gelatin and graphene. PVP plays the role of plasticization and molding in the core layer, and graphite powder plays the role of electron transfer. Gelatin plays a plasticizing role in the shell, and its molecular structure is rich in carbonyl and ether groups, which can screen and enrich the target detection substance (ATP). Graphene is the second component of the shell, its huge specific surface area and good conductivity are conducive to the attachment of ATP and improve the electron transfer efficiency between ATP and graphene.

[0064] Preparation of nuclear layer solution: 1 g of polyvinylpyrrolidone (PVP; M w =1,300,000) into 21 mL of absolute ethanol, then 7 mL of glacial acetic acid, and stirred for 3 to 5 hours to obtain a PVP solution with a mass concentration of 4%. ...

Embodiment 2

[0071]The ATP sensor prepared in this example has a core-shell double-layer structure, and the composition of the core layer is based on Example 1 (PVP+graphite powder), and the conductive phase in the core layer is improved by adding a certain amount of toluene acetylene. Density and electron transport rate, thereby improving the detection accuracy of the sensor.

[0072] Preparation of the nuclear layer solution: Add 1 g of polyvinylpyrrolidone (PVP; Mw=1,300,000) into 21 mL of absolute ethanol, then add 7 mL of glacial acetic acid, and stir for 3 to 5 hours to prepare a PVP solution with a mass concentration of 4%. In order to improve the transport capacity of electrons in the electrode, add 1.0 g of ultrafine graphite powder (average particle size is 1.2 microns) and 0.5 g of tolanin to the prepared nuclear layer solution, and stir for 1 hour to obtain a nuclear layer spinning silk solution.

[0073] Preparation of the shell solution: the same as in Example 1.

[0074] P...

Embodiment 3

[0079] Preparation of nuclear layer solution: same as in Example 2.

[0080] Preparation of shell solution: due to the large electrostatic repulsion between chitosan molecules, it is not easy to directly carry out electrospinning, so a certain proportion (1:1) of polyethylene oxide is added in this embodiment to improve chitosan Electrospinning performance. First, 0.5 g of chitosan and polyethylene oxide (PEO) were respectively added into 5.5 mL of glacial acetic acid, and stirred for 1 hour to obtain a solution with a mass concentration of 8%. Then the two solutions were mixed and stirred for 30 minutes to obtain a mixed solution containing chitosan and PEO.

[0081] Preparation of coaxial ultramicroelectrode fibers: Fill the prepared core layer and shell layer spinning solutions into two 5mL syringes respectively, and fix the syringes on two syringe pumps respectively. According to the different positions of the mixed solution in the coaxial electrode layer, connect the co...

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Abstract

The invention relates to a preparation method and application of a core-shell type ultra-micro electrode. The core-shell structure ultra-micro electrode is obtained by preparing ultra-micro electrode fibers of a coaxial structure in a one-step mode through a coaxial electrostatic spinning method and then performing packaging. The coaxial structure comprises a core electrode base layer and one or two surface sensing layers. By the adoption of the one-step forming technology, the complex surface modification process of traditional ultra-micro electrodes (such as glassy carbon electrodes obtained after ablation treatment) is omitted, and the ultra-micro electrode with the diameter ranging from 40 nm to 6 micrometers can be prepared; due to the subsequent treatment temperature ranging from 70 DEG C to 150 DEG C, the structures and functions of organic functional components (such as biological protein and enzymes) in a modification layer of the ultra-micro electrode can be easily maintained, which is of great significance for the pluralistic design of the ultra-micro electrode. The ultra-micro electrode is used for detecting adenosine triphosphate (ATP), dopamine and adrenal hormones and is high in response speed and sensitivity, strong in anti-jamming capability and especially suitable for on-line rapid determination, particularly, real-time non-destructive determination of living cells.

Description

technical field [0001] The invention relates to the technical field of ultramicro electrodes, in particular to a core-shell structure ultramicro electrode and a method for preparing the core-shell structure ultramicro electrode fibers by coaxial electrospinning. Background technique [0002] Ultramicroelectrode refers to a type of electrode whose one-dimensional size is micron or nanoscale. When the one-dimensional size of the electrode is reduced from the millimeter level to the micron and nanometer level, it exhibits many excellent electrochemical properties different from conventional electrodes: the inherently small RC time constant of the ultramicro electrode makes it possible to study fast, Transient electrochemical reaction; the small polarization current on the ultra-micro-electrode reduces the IR drop of the system, making it suitable for use in high-resistance systems, including low-supported electrolytic concentrations or even unsupported electrolyte solutions, ga...

Claims

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Application Information

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IPC IPC(8): B81B1/00B81C1/00B82Y40/00D01D5/00
CPCB81B1/00B81C1/0038B82Y40/00D01D5/0061D01D5/0069D01D5/0092
Inventor 阮承祥娄瑾
Owner JIANGXI SCI & TECH NORMAL UNIV
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