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Method for preparing graphene quantum dots with adjustable oxygen content

A technology of graphene quantum dots and oxygen content, which is applied in the direction of nanotechnology, can solve the problems of special equipment, expensive preparation raw materials, and large amount of use, and achieve the effects of low production cost, easy industrialization, and increased speed

Active Publication Date: 2016-03-23
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the quantum yield is higher in the top-down method, there are disadvantages such as the need to use a large amount of strong acid or cumbersome operation steps.
Although the top-down method is easy to control the size and shape of graphene quantum dots, it requires special equipment, expensive preparation materials, and extremely complicated operation steps, and the prepared graphene quantum dots have limited oxygen-containing functional groups, which is not conducive to their dissolution and Further functionalization and passivation of graphene quantum dots

Method used

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  • Method for preparing graphene quantum dots with adjustable oxygen content

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Embodiment approach 1

[0025]Preparation concentration is 0.1mol / L, the phosphate buffer saline (PBS) of PH=7, adds biological phosphate buffer solution and 30wt.% hydrogen peroxide solution (volume ratio is 1:1), insert two high-purity graphite rods as working electrode and counter electrode; add a certain volume of phosphate buffer solution into No. 2 container (quartz or glass product), insert two high-purity graphite rods as working electrode and The counter electrode is irradiated with ultraviolet light with a wavelength of 254nm on the No. 2 device; the No. 1 container and the No. 2 container are connected in parallel to the electrochemical workstation, and electrochemical cyclic voltammetry is used. Ag / AgCl as reference electrode, light as working electrode and counter electrode at the same time Electrochemical cyclic voltammetry preparation of water-soluble graphene quantum dots: high-purity graphite rods are used as working electrode and counter electrode at the same time, Ag / AgCl as referen...

Embodiment approach 2

[0028] Preparation concentration is 0.1mol / L, the phosphate buffered saline (PBS) of PH=7, adds phosphate buffered saline solution and 30wt.% hydrogen peroxide solution (volume ratio is ( 40:1), insert two high-purity graphite rods as working electrodes and counter electrodes; add a certain volume of phosphate buffer solution into No. 2 container (quartz or glass products), insert two high-purity graphite rods as working electrodes and Counter electrode, with wavelength is 365nm ultraviolet radiation device No. 2; No. 1 container and No. 2 container are connected in parallel to electrochemical workstation, adopt electrochemical cyclic voltammetry. Ag / AgCl is made reference electrode, and light is simultaneously as working electrode and Preparation of water-soluble graphene quantum dots by counter electrode electrochemical cyclic voltammetry: use high-purity graphite rod as the working electrode and counter electrode at the same time, Ag / AgCl as the reference electrode, cyclic v...

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Abstract

The invention belongs to the technical field of preparation of graphene quantum dots, and relates to a method for preparing graphene quantum dots with adjustable oxygen content. The method comprises the steps that a brown graphene quantum dot water solution containing impurities is prepared through an electrochemistrical cyclic voltammetry method and then dialyzed, and a transparent flavescent graphene quantum dot water solution is obtained; the graphene quantum dots with different oxygen contents are prepared by regulating the oxidoreduction degree of an electrolyte in the electrochemistrical method preparation process. According to the method, the oxygen contents of the graphene quantum dots are effectively regulated, and the speed of preparing the graphene quantum dots through the electrochemistrical cyclic voltammetry method is increased. Meanwhile, the method is simple in preparation procedure, and has the advantages of being environmentally friendly and low in production cost and facilitating industrialization.

Description

[0001] The invention belongs to the technical field of preparation of graphene quantum dots, and in particular relates to preparing graphene quantum dots with different oxygen contents by regulating the oxidation-reduction degree of electrolyte in the process of electrochemical preparation. Background technique [0002] In recent years, graphene has attracted increasing attention due to its unique properties, such as large specific surface area, high carrier mobility, excellent mechanical flexibility, good thermal / chemical stability, and environmental friendliness. characteristics etc. As a new member of the graphene family, zero-dimensional graphene quantum dots with quantum effects and boundary effects have emerged. Graphene quantum dots have excellent photophysical properties, good chemical inertness, biocompatibility, and water solubility, which make them have broad application prospects in bioimaging, biosensors, catalysts, and drug delivery. (M.A.Sk, A.Ananthanarayanan,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y40/00
CPCC01P2002/82C01P2002/85C01P2004/64
Inventor 李妍刘会刘新倩李森
Owner UNIV OF SCI & TECH BEIJING
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