Electrophoretically-deposited carbon nano tube modified carbon fiber electrode and application thereof in in-vivo detection of ascorbic acid

A carbon fiber electrode and carbon nanotube technology, which is used in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve the problem of low yield of modified carbon nanotube electrodes, high selectivity and reproducibility, and difficulty in carbon Nanotube electrodes and other problems, to achieve the effect of tight adsorption, high reproducibility, and not easy to fall off

Active Publication Date: 2019-07-26
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult for carbon nanotubes to be adsorbed on the surface of carbon fibers, and this method has high requirements for operation accuracy. It takes a long time of repeated operations to successfully modify carbon nanotubes on the electrode surface, and it is difficult to obtain an electrode with uniform thickness control of carbon nanotubes, resulting in The method of drop coating modification cannot easily and quickly obtain an electrode with high selectivity and reproducibility for the detection of ascorbic acid
At the same time, carbon fibers are easily broken during the modification process, resulting in a low yield of electrodes modified with carbon nanotubes.

Method used

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  • Electrophoretically-deposited carbon nano tube modified carbon fiber electrode and application thereof in in-vivo detection of ascorbic acid
  • Electrophoretically-deposited carbon nano tube modified carbon fiber electrode and application thereof in in-vivo detection of ascorbic acid
  • Electrophoretically-deposited carbon nano tube modified carbon fiber electrode and application thereof in in-vivo detection of ascorbic acid

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Experimental program
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Effect test

Embodiment 1

[0047] The preparation of carbon fiber electrode: carbon fiber electrode adopts existing method to prepare, specifically as follows: First, glass capillary (outer diameter: 1.5mm; Inner diameter: 0.89mm; Length: 10cm) in microelectrode drawing instrument (WD-1 type, Chengdu Instrument Factory) to make two tapered capillaries with very thin tips. Under an optical microscope, use a scalpel to cut off the glass tip, and the inner diameter of the reserved port is about 30-50 μm. Then stick about 2cm long carbon fiber on a about 10cm copper wire with conductive silver glue, and thread it into the drawn capillary, so that the carbon fiber is exposed about 3mm in length outside the tip of the capillary. Then use epoxy resin (ethylenediamine as a curing agent) to seal the gap at the tip to prevent the test solution from entering the capillary. Excess epoxy on the capillaries and carbon fibers was removed with acetone and left overnight to allow the epoxy to cure. Seal the other end o...

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Abstract

The invention discloses a new method used for modifying a carbon fiber electrode with carbon nano tubes. The method comprises the step of depositing single-walled carbon nano tubes on a carbon fiber electrode by adopting an electrophoretic deposition method, wherein electrophoretic deposition is realized by virtue of a two-electrode system, and the method comprises the following specific steps: inserting the carbon fiber electrode and a Pt wire into single-walled carbon nano tube dispersion, applying a voltage of 1.9-2.5V by virtue of amperometry and performing electrophoretic deposition for 10-100s, thus the carbon fiber electrode modified by the uniformly deposited carbon nano tubes can be obtained. Before in vivo analysis is performed, high temperature and electrochemical simple treatment is performed on the carbon nano tube modified carbon fiber electrode, so that the electrode can have high selectivity and sensitivity on ascorbic acid and can be used for in vivo intracerebral in situ determination on change of concentration of ascorbic acid.

Description

technical field [0001] The invention relates to an electrophoretic deposition carbon nanotube modified carbon fiber electrode and its application in the detection of living ascorbic acid. Background technique [0002] Ascorbic acid, also known as vitamin C, is an important neurochemical molecule in the brain. It mainly functions as an antioxidant and neuromodulator in the brain. Therefore, the change and accurate determination of ascorbic acid concentration are of great significance for the study of a series of physiological and pathological processes. . Among the various detection methods of ascorbic acid, the electrochemical method has attracted much attention due to its advantages of high temporal and spatial resolution, high sensitivity, and good selectivity. When the electrochemical method is used for in situ detection of the living body, carbon fiber electrodes with a thickness of about 7 μm are often used as probes, which cause less damage to the organism during real...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/447
CPCG01N27/447
Inventor 毛兰群肖通方蒋亚楠于萍
Owner INST OF CHEM CHINESE ACAD OF SCI
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