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Multi-wall carbon nano-tube bridged 3D graphene conductive network and preparation method thereof

A technology of multi-walled carbon nanotubes and conductive networks, which is applied in nanomedicine, nanotechnology, nanotechnology, etc., can solve the problems of cumbersome operation, low detection sensitivity, and numerous steps, and achieve simple operation, simple synthesis steps, and environmental protection Effect

Inactive Publication Date: 2015-06-24
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the deficiencies of the prior art, such as cumbersome operation, numerous steps, and low detection sensitivity; it provides a 3D graphene conductive network bridged by multi-walled carbon nanotubes

Method used

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  • Multi-wall carbon nano-tube bridged 3D graphene conductive network and preparation method thereof
  • Multi-wall carbon nano-tube bridged 3D graphene conductive network and preparation method thereof
  • Multi-wall carbon nano-tube bridged 3D graphene conductive network and preparation method thereof

Examples

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preparation example Construction

[0026] Such as figure 1 Shown, a 3D graphene conductive network bridged by multi-walled carbon nanotubes and a one-pot preparation method thereof, the method comprises the following steps:

[0027] Step 1, prepare graphite oxide solid with natural flake graphite powder; Described graphite oxide solid adopts improved Hummers method to prepare;

[0028] Step 2, ultrasonic preparation of graphene oxide DMF suspension;

[0029] Step 3, preparing CDs functionalized graphene oxide (GO-CDs);

[0030] Step 4. Prepare DMF suspensions of GO-CDs and carboxylated carbon nanotubes respectively, wherein the ratio of GO-CDs to DMF is (1:10~5:1) mg / mL; the ratio of MWNTs to DMF The ratio is (1:10~5:1)mg / mL; the ultrasonic time is 1~10h;

[0031] Step 5. After mixing the two suspensions in step 4, add a reducing agent to construct a 3D graphene conductive network bridged by multi-walled carbon nanotubes; the reducing agent is a mixture of hydrazine hydrate and ammonia; GO-CDs and hydration ...

Embodiment 1

[0034] The first step, the preparation of graphite oxide solid;

[0035] At 80°C, 20g of natural graphite was pre-oxidized with 30mL of concentrated sulfuric acid, 10g of potassium persulfate and 10g of phosphorus pentoxide, washed with water until pH = 7, and dried at room temperature overnight for use;

[0036]Cool 460mL of concentrated sulfuric acid to about 0°C, then add 20g of pre-oxidized graphite into it, slowly add 60g of potassium permanganate so that the temperature of the system does not exceed 20°C, after the addition, raise the temperature to 35°C, and stir for 2 hours, And slowly add 920mL of deionized water in batches, so that the system temperature does not exceed 98°C, and after stirring for 15 minutes, add 2.8L of deionized water and 50mL of 30% hydrogen peroxide. The resulting bright yellow suspension was filtered under reduced pressure and washed. Until there is no sulfate ion in the filtrate, and when it is neutral, the product is dried in vacuum at 60°C ...

Embodiment 2

[0043] The first to second steps are the same as steps one to two in Example 1;

[0044] In the third step, 20 mg of the second-step product GO-CDs and 20 mg of carboxylated MWNTs were ultrasonically dispersed in 20 mL of N,N-dimethylformamide (DMF) for 7 h, respectively. Then, after mixing the two well-dispersed suspensions, 600 μL of ammonia water and 50 μL of hydrazine hydrate were added, and the reaction was stirred at 60° C. for 3.5 h.

[0045] The fourth step is the same as step four in Example 1.

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Abstract

The invention discloses a carboxylation multi-wall carbon nano-tube bridged 3D graphene conductive network and a preparation method thereof. The method comprises the steps of preparing graphite oxide, preparing cyclodextrin functionalized graphene and preparing the carboxylated multi-wall carbon nano-tube bridged 3D graphene conductive network. The covalence organic decoration technology and the non-covalence organic decoration technology are scientifically combined, a nano hybridized material responding to electrochemical promotion of dopamine, ascorbic acid, purine trione and tryptophan is established, and the electrochemical performance of a nano material is adjusted by changing the type of cyclodextrin and the content of the carboxylated multi-wall nano-tube; the 3D functionalized nano material is simple in synthesis step, efficient, simple in after-treatment and easy for mass preparation; moreover, by adopting the 3D functionalized nano material, DA, AA, UA and Trp can be sensitively detected in a complicated environment in the presence of other interference substances; the defect that CDs is likely to drop can be effectively solved, and the conductivity of the system and the CDs selectivity can be remarkably improved by virtue of the non-covalence bridging of the carboxylated carbon nano-tube.

Description

technical field [0001] The invention relates to a 3D graphene conductive network bridged by multi-walled carbon nanotubes and a preparation method thereof, especially a nano-hybrid material with electrochemically enhanced responses to dopamine, ascorbic acid, uric acid and tryptophan, which can be used in The field of material preparation for physiologically selective electrochemical detection and quantification in the field of early clinical diagnosis and neurochemical research. Background technique [0002] Dopamine (3,4-dihydroxyphenylethylamine, DA), as the most typical catecholamine neurotransmitter, plays a key role in the control of mammalian metabolism, cardiovascular system, central nervous system, kidney and hormone functions. Abnormal DA concentration is a sensitive indicator of certain pathological states. For example, schizophrenia, Alzheimer's disease, Parkinson's disease and psychological disorders. Since DA is electroactive, it can be detected by electroche...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26B82Y30/00B82Y40/00B82Y5/00
Inventor 张树鹏高娟娟宋海欧刘茂祥宋欣太玉钱悦月
Owner NANJING UNIV OF SCI & TECH
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