Method for detecting dopamine by acidified graphdiyne nanotube/short multi-walled carbon nanotube modified electrode

Abstract

The invention relates to a method for detecting dopamine by an acidified graphdiyne nanotube / short multi-walled carbon nanotube modified electrode. By using composite graphdiyne nanotubes GDY and short multi-walled carbon nanotubes S-MWCNTs as electrode modification materials, a GDY / S-MWCNTs modified electrode for detecting dopamine with high sensitivity and high selectivity is prepared. As the GDY has a tremella-shaped three-dimensional surface structure, the GDY has a great effective surface area and shows ultrahigh DA enrichment capacity. The S-MWCNTs are obtained by ultrasonically treatingthe multi-walled carbon nanotubes in mixed acid, can be inserted into acupuncture points on the GDY nanotubes and are in full contact with the GDY nanosheets, so that a good way is provided for accelerating electron transmission of a sensor interface. Because the surfaces of the acidified GDY and S-MWCNT contain a large number of chemical oxygen-containing groups, some interferent molecules can be eliminated through electrostatic repulsion, so that the selectivity of a sensor interface to DA is improved. A modified electrode prepared from the material has good response performance to dopaminedetection, and the lowest detection limit can reach 8 pmol / mL.

Description

technical field [0001] The invention belongs to the field of biochemical detection, and in particular relates to a method for detecting dopamine at an acidified graphyne nanotube / short multi-wall carbon nanotube modified electrode. Background technique [0002] Graphdiyne (GDY) is a kind of sp and sp 2 Synthetic carbon allotropes with hybridized carbon atoms and π-conjugation. According to the prediction, it has many attractive properties including high fluorescence efficiency, good heat resistance, excellent electrical conductivity, etc. Since the first synthetic graphyne was reported in 2010, it has been widely used in catalysts, rechargeable batteries, solar cells, electronic devices, detectors, biomedicine, water purification and other fields. The team of Li Yuliang of the Chinese Academy of Sciences has prepared high-quality GDY nanotubes composed of entangled ultrathin GDY nanosheets. GDY is bendable and ultra-light. It has been used in lithium-ion battery negative...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is aimed at the average content of DA in the human body at 10 -6 ~10 -9 In the M range, many traditional electrochemical techniques are not sensitive enough for DA quantification at this level. A method for the detection of dopamine using acidified graphyne nanotubes / short multi-walled carbon nanotubes modified electrodes is provided, which has high detection sensitivity and selectivity. high

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