Cobalt oxide-hydroxylated single-walled carbon nanotube composite material and preparation and application thereof

A technology of single-walled carbon nanotubes and single-walled nanotubes, applied in the direction of carbon nanotubes, cobalt oxide/cobalt hydroxide, nano-carbon, etc., can solve problems such as poor dispersion, inability to form a uniform electrode modification layer, and easy agglomeration. Achieve the effect of improving electrical conductivity, excellent selectivity, and high electrocatalytic activity

Active Publication Date: 2021-06-22
HUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, SWCNTs have very poor dispersibility in water, are easy to agglomerate, and cannot form a uniform electrode modification layer. In order to solve this problem, a hydrophilic group (-OH) is introduced on the surface of SWCNTs to form a hydroxylation with good dispersion and stability. Single-walled carbon nanotubes (SWCNTs-OH), which facilitate the application of SWCNTs in the field of electrochemical sensing

Method used

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  • Cobalt oxide-hydroxylated single-walled carbon nanotube composite material and preparation and application thereof
  • Cobalt oxide-hydroxylated single-walled carbon nanotube composite material and preparation and application thereof
  • Cobalt oxide-hydroxylated single-walled carbon nanotube composite material and preparation and application thereof

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Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of cobalt oxide / hydroxylated single-walled carbon nanotube modified electrode, comprising the following steps:

[0026] S1. Preparation of cobalt oxide nanoparticles: Mix 0.5 mmol of cobalt nitrate hexahydrate solution with 12 mmol of ammonia water, stir at room temperature (25 °C) for 1 hour, then transfer to the reactor, and conduct hydrothermal reaction at 140 °C for 6 h , after cooling to room temperature, the product was collected, washed with ultrapure water, and dried at 60 °C for 12 h to obtain the cobalt oxide nanoparticles;

[0027] S2. Preparation of hydroxylated single-walled carbon nanotubes: Add 200 mg of SWCNTs to 50 mL of 30% aqueous hydrogen peroxide solution using a condensing reflux device, and stir the reaction at 100 °C for 4 h. After repeated washing with pure water, the reaction precipitate was collected and freeze-dried at -50°C for 24 h to obtain the hydroxylated single-walled carbon nanotubes;

[0028] S3. Preparation of c...

Embodiment 2

[0031] A preparation method of cobalt oxide / hydroxylated single-walled carbon nanotube modified electrode, comprising the following steps:

[0032]S1. Preparation of cobalt oxide nanoparticles: Mix 0.5 mmol of cobalt nitrate hexahydrate solution with 1 mmol of ammonia water, stir at room temperature (25 °C) for 3 hours, then transfer to a reaction kettle, and conduct a hydrothermal reaction at 180 °C for 4 h , after cooling to room temperature, the product was collected, washed with ultrapure water, and dried at 60 °C for 12 h to obtain the cobalt oxide nanoparticles;

[0033] S2. Preparation of hydroxylated single-walled carbon nanotubes: Add 50 mg of SWCNTs to 100 mL of 30% aqueous hydrogen peroxide solution using a condensing reflux device, and stir the reaction at 100 °C for 4 h. After repeated washing with pure water, the reaction precipitate was collected and freeze-dried at -50°C for 24 h to obtain the hydroxylated single-walled carbon nanotubes;

[0034] S3. Preparati...

Embodiment 3

[0037] A preparation method of cobalt oxide / hydroxylated single-walled carbon nanotube modified electrode, comprising the following steps:

[0038] S1. Preparation of cobalt oxide nanoparticles: Mix 0.5 mmol of cobalt nitrate hexahydrate solution with 2 mmol of ammonia water, stir at room temperature (25 °C) for 2 hours, then transfer to the reactor, and conduct a hydrothermal reaction at 120 °C for 8 h , after cooling to room temperature, the product was collected, washed with ultrapure water, and dried at 60 °C for 12 h to obtain the cobalt oxide nanoparticles;

[0039] S2. Preparation of hydroxylated single-walled carbon nanotubes: Add 50 mg of SWCNTs to 100 mL of 30% aqueous hydrogen peroxide solution using a condensing reflux device, and stir the reaction at 100 °C for 2 h. After repeated washing with pure water, the reaction precipitate was collected and freeze-dried at -50°C for 24 h to obtain the hydroxylated single-walled carbon nanotubes;

[0040] S3. Preparation of...

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Abstract

The invention belongs to the technical field of composite materials, and discloses a cobalt oxide-hydroxylated single-walled carbon nanotube composite material, wherein cobalt oxide nanoparticles with uniform particle size and good crystal form and hydroxylated single-walled carbon nanotubes with a reticular distribution structure are subjected to ultrasonic self-assembly, so that the agglomeration phenomenon of cobalt oxide is weakened, and the conductivity of the cobalt oxide is improved; the distance between the hydroxylated carbon oxide nanotubes is increased, the bonding effect between hydroxyl components on the hydroxylated carbon oxide nanotubes is weakened, more active sites are exposed, and the hydroxyl components can show different selectivity to dopamine and other interferent molecules through different electrostatic acting forces. The prepared composite material has the advantages of large specific surface area, high catalytic activity, good conductivity and many active catalytic sites, and can be stably and uniformly dispersed in an aqueous solution. The composite material is used as an electrochemical sensing material, and the prepared modified electrode has a large number of active sites and excellent conductivity, has good catalytic performance and selectivity on dopamine, and can be applied to electrochemical detection of dopamine.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a cobalt oxide-hydroxylated single-walled carbon nanotube composite material and its preparation and application. Background technique [0002] Dopamine (DA) is an important catechol neurotransmitter in the human central system, which plays an important role in controlling emotions, cognition, behavior and memory and other human activities. Disregulation of dopamine concentration in the brain can cause diseases such as schizophrenia, Parkinson's disease, Huntington's syndrome and HIV infection. The concentration of DA in the human body can be used as a pathological indicator of the above diseases, and its equilibrium concentration in a normal human body is 10.0 nmol L -1 -1.0 μmol L -1 , its content can be as low as 1.0 nmol L in patients with Parkinson's disease -1 Therefore, it is of great practical significance to choose a detection technique with h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04C01B32/174C01B32/168C01B32/159G01N27/30G01N27/48
CPCC01G51/04C01B32/168C01B32/159C01B32/174G01N27/308G01N27/48C01P2004/80
Inventor 于金刚关金锋刘国聪卢明邱思吴志梁
Owner HUIZHOU UNIV
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