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Preparation method of functionalized graphite flake compound

A compound and fossil technology, applied in the fields of carbon compounds, chemical instruments and methods, graphite, etc., can solve the problems of time-consuming and difficult to realize the operation process, and achieve the effect of improving density and high-sensitivity detection.

Active Publication Date: 2022-04-01
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the commonly used methods for modifying the electrode surface are adsorption method, covalent bonding method, electrochemical deposition method, etc., but the operation process is time-consuming, and it is difficult to realize in industrial mass production modules.

Method used

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  • Preparation method of functionalized graphite flake compound
  • Preparation method of functionalized graphite flake compound
  • Preparation method of functionalized graphite flake compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, graphite powder and pyrenebutyric acid were used as raw materials to prepare carboxyl-functionalized graphite sheet by ultrasonic stripping method, and then amino-functionalized graphite sheet composite was prepared with polyethyleneimine. The specific steps are as follows:

[0037] Step 1: Weigh 40 mg of pyrenebutyric acid (PBA) and add it to 50 mL of DMF, dissolve it by ultrasonication, then add 600 mg of graphite powder (1200 mesh) to it, use an ultrasonic cell pulverizer for continuous ultrasonication for 7 hours (power 25W), and then Speed ​​centrifugation for 5 minutes, take the upper suspension, and then centrifuge at 9000rpm for 20 minutes, and wash the precipitate twice with DMF and deionized water respectively, put it in a vacuum drying oven at 60°C and dry it to obtain carboxyl-functionalized graphite flakes, record for PBA@GSs. The morphology of graphite was observed by scanning electron microscopy.figure 1 It can be seen from the left pictu...

Embodiment 2

[0040] In this example, graphite powder and pyrene formaldehyde were used as raw materials to prepare aldehyde-based functionalized graphite sheets by ultrasonic stripping method, and then amino-functionalized graphite sheet composites were prepared with hexamethylenediamine. The specific steps are as follows:

[0041] Step 1: Weigh 60 mg of pyrene formaldehyde (PyCHO) and dissolve it in 30 mL of DMF, then add 500 mg of graphite powder (1200 mesh) to it, then place it in an ultrasonic cell pulverizer for continuous ultrasonication for 7 hours (power 25W), and then centrifuge at 500 rpm After 5 minutes, the upper layer suspension was taken, and then centrifuged at 9000 rpm for 15 minutes, and the precipitate was washed twice with DMF and deionized water, and dried at 60°C to obtain aldehyde-functionalized graphite sheets, which were designated as PyCHO@GSs.

[0042] Step 2: Weigh 60 mg of hexamethylenediamine and dissolve it in 30 mL of absolute ethanol, then add 300 mg of PyCHO...

Embodiment 3

[0044] In this example, graphite powder and pyrene formaldehyde were used as raw materials to prepare aldehyde functionalized graphite sheet by ultrasonic stripping method, and then made amino functionalized graphite sheet composite with hexamethylenediamine, and then mixed with methyl vinyl ether-maleic anhydride Copolymer reaction, the anhydride-based functionalized graphite flake composite is obtained, and the specific steps are as follows:

[0045] Step 1: Weigh 60 mg of pyrene formaldehyde (PyCHO) and dissolve it in 30 mL of DMF, then add 500 mg of graphite powder (1200 mesh) to it, then place it in an ultrasonic cell pulverizer for continuous ultrasonication for 7 hours (power 25W), and then centrifuge at 500 rpm After 5 minutes, the upper layer suspension was taken, and then centrifuged at 9000 rpm for 15 minutes, and the precipitate was washed twice with DMF and deionized water, and dried at 60°C to obtain aldehyde-functionalized graphite sheets, which were designated a...

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Abstract

The invention discloses a preparation method of a functionalized graphite flake compound, which is characterized in that graphite powder, pyrene formaldehyde or pyrene butyric acid are used as raw materials to prepare the functionalized graphite flake compound through an ultrasonic exfoliation method, the graphite powder can be ultrasonically exfoliated into layered graphite flakes, and pyrene compounds can be adsorbed onto the graphite flakes through pi-pi interaction. Therefore, the aldehyde group or carboxyl functionalized graphite flake compound can be prepared. On the basis, hexamethylenediamine or amino-containing macromolecular polyethyleneimine and carboxyl-containing macromolecular polyacrylic acid or a methyl vinyl ether-maleic anhydride copolymer are further covalently bound to the surface of the graphite flake, so that the density of functional groups on the surface of the graphite flake is remarkably improved. The functionalized graphite flake compound obtained by the method is powdery and can be used for industrial mass production and modification of the printed electrode in a scattering manner, the method is simple and efficient, and the functionalization of the printed electrode provides convenience for subsequent biomolecule immobilization.

Description

technical field [0001] The invention belongs to the technical field of immobilization of biomolecules, and in particular relates to a preparation method of a functionalized graphite sheet composite. Background technique [0002] In recent years, in order to obtain good biomolecular immobilization effect and excellent sensor performance, many new functional materials have been designed as biosensing interfaces. Carbon nanomaterials have high electron mobility, high specific surface area and good conductivity, and have broad application prospects in the field of biosensing, among which graphene is the most widely used material. Graphene is a two-dimensional carbon nanomaterial with closely packed carbon atoms in a honeycomb lattice. It not only has a large specific surface area, but also has an adjustable composition and morphology. It is widely used in the immobilization of biomolecules and the modification of biosensing interfaces. [0003] Electrochemical sensors have beco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/225C01B32/21
Inventor 高强聂瑞丹王静
Owner SHAANXI NORMAL UNIV
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