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Method for dispersing carbon nanotubes by aspartame, and application electrode

A carbon nanotube and aspartame technology, applied in nanotechnology, nanotechnology, nanotechnology for sensing, etc., can solve the problems of high price, limit the practical application of carbon nanotubes, etc. Electrochemical sensing detection ability, excellent dispersion effect

Active Publication Date: 2013-07-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dispersants reported in the literature, such as surfactants and high molecular polymers, have certain biological toxicity, while the synthesis of dispersants such as DNA chains and polypeptides is expensive. These factors largely limit the practical application of carbon nanotubes.

Method used

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  • Method for dispersing carbon nanotubes by aspartame, and application electrode
  • Method for dispersing carbon nanotubes by aspartame, and application electrode
  • Method for dispersing carbon nanotubes by aspartame, and application electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Select multi-walled carbon nanotubes as functional modification objects, and glassy carbon electrodes as modified electrodes. The specific operation steps are as follows:

[0032] (1) Preparation of dispersant aspartame solution: add commercially available industrial product aspartame (purity>99%) into double distilled water and stir to dissolve, and the dissolved concentration of aspartame is 2.0mg / mL;

[0033] (2) Add multi-walled carbon nanotubes to the above solution, and ultrasonically disperse in an ice-water bath with an ultrasonic power of 125W for 30 minutes to obtain a black suspension, wherein the multi-walled carbon nanotubes and aspartame The mass ratio is 1:10;

[0034] (3) Centrifuge the above suspension at 10,000rpm for 30 minutes, discard the centrifuged sediment, which is the unfunctionalized nanotube aggregates, and the stable dispersed black solution in the upper layer is the aspartame functionalized multi-walled carbon nanotube composite thing;

...

Embodiment 2

[0039] Select multi-walled carbon nanotubes as functional modification objects, and glassy carbon electrodes as modified electrodes. The specific operation steps are as follows:

[0040] (1) Preparation of dispersant aspartame solution: commercially available industrial aspartame (purity>99%) was stirred and dissolved in double distilled water, and the dissolved concentration of aspartame was 0.5 mg / mL;

[0041](2) Add multi-walled carbon nanotubes to the above solution, and ultrasonically disperse them in an ice-water bath with an ultrasonic power of 150W for 20 minutes to obtain a black suspension, wherein the multi-walled carbon nanotubes and aspartame The mass ratio is 1:2.5;

[0042] (3) Centrifuge the above suspension at 10,000 rpm for 40 minutes, and keep the upper black solution as a stable aspartame-functionalized multi-walled carbon nanotube composite dispersion;

[0043] (4) Preparation of functionalized multi-walled carbon nanotube modified electrode: apply 20 mic...

Embodiment 3

[0046] Select multi-walled carbon nanotubes as functional modification objects, and glassy carbon electrodes as modified electrodes. The specific operation steps are as follows:

[0047] (1) Preparation of dispersant aspartame solution: add commercially available industrial aspartame (purity>99%) into double distilled water and stir to dissolve, the dissolved concentration of aspartame is 4mg / mL;

[0048] (2) Add multi-walled carbon nanotubes to the above solution, and ultrasonically disperse them in an ice-water bath with an ultrasonic power of 100 W for 40 minutes to obtain a black suspension, wherein the multi-walled carbon nanotubes and aspartame The mass ratio is 1:20;

[0049] (3) Centrifuge the above suspension at 10,000rpm for 35 minutes, discard the precipitate, which is the unfunctionalized carbon nanotube aggregates, and the upper black solution is the stable aspartame functionalized multi-walled carbon nanotube complex Dispersions;

[0050] (4) Preparation of fun...

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Abstract

The invention relates to a method for dispersing carbon nanotubes by aspartame, and an application electrode. The method comprises the following steps of: stirring and dissolving the aspartame in double distilled water; adding carbon nanotube powder, wherein the mass ratio of the carbon nanotube to the aspartame is equal to 1:2.5 to 1:20; ultrasonically dispersing a dispersant solution containing the carbon nanotubes in an ice water bath to obtain a black suspension; and centrifuging the suspension at a high speed, and discarding a precipitate after centrifugation to obtain an aspartame functionalization modified carbon nanotube dispersant solution. The dispersant functionalized carbon nanotube modified electrode is modified by 10-20 microliters of the functionalized carbon nanotube dispersant solution, and the dispersant solution is coated on the surface of a glassy carbon electrode or a gold electrode. The dispersant adopted by the method is an amphiphilic dipeptide derivative with low cost and good biocompatibility, the method is simple and easy to implement, the stability of the dispersant solution is high, the detection on hydrogen peroxide shows that the sensing detection capability of the electrode is improved by the modification of the aspartame / carbon nanotubes, and the detection potential is effectively reduced.

Description

technical field [0001] The invention relates to a green and economical carbon nanotube dispersant and a method for preparing a functionalized carbon nanotube modified electrode, belonging to the field of carbon nanotube dispersion and its application. Background technique [0002] Due to their unique physical and chemical properties, such as excellent axial conductivity, super mechanical properties, high specific surface area and quantum size effect, etc., carbon nanotubes are widely used in supercapacitors, catalyst carriers, sensing and detection, etc. It has broad application prospects in many fields. However, there is a strong van der Waals force between carbon nanotubes. Usually, they exist in water and general organic solvents in the state of entangled aggregates. Pipeline is the key issue to be solved first. [0003] At present, the dispersion methods of carbon nanotubes reported in the literature are mainly divided into two categories: covalent modification and non...

Claims

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Application Information

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IPC IPC(8): G01N27/30B82Y15/00
Inventor 苏荣欣梁淼齐崴何志敏
Owner TIANJIN UNIV