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Method for preparing graphene quantum dot

A graphene quantum dot, graphene technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as toxicity, limited quantum dot application, complex synthesis process, etc.

Inactive Publication Date: 2012-08-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The earliest quantum dots are generally composed of some transition metals, such as cadmium, selenium, tellurium, etc. These transition metals have certain toxicity, and their synthesis process is relatively complicated. These defects also limit the application of quantum dots.

Method used

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  • Method for preparing graphene quantum dot
  • Method for preparing graphene quantum dot
  • Method for preparing graphene quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Disperse 100mg of graphene oxide in 25ml of water, add 1ml of concentrated ammonia water, transfer the mixture to an autoclave, raise the temperature to 200°C for 5h, and cool to room temperature. The obtained upper layer was separated at night to obtain an aqueous dispersion of graphene quantum dots, which exhibited strong blue-green fluorescence under ultraviolet light.

[0024] The maximum emission wavelength of the ammonia water passivated graphene quantum dots prepared by the reaction is at 320nm, and the maximum excitation wavelength is at 410nm.

Embodiment 2

[0026] Disperse 100 mg of graphene oxide in 25 ml of water, add 10 mg of polyethyleneimine (PEI), transfer the mixture to a high-pressure reactor, raise the temperature to 180 ° C for 3 h, and cool to room temperature. The obtained clear liquid is separated to obtain an aqueous dispersion of graphene quantum dots, which exhibits strong blue fluorescence under ultraviolet light.

[0027] The maximum emission wavelength of the polyethyleneimine graphene quantum dots prepared by the reaction is at 319nm, and the maximum excitation wavelength is at 385nm.

Embodiment 3

[0029] Disperse 100mg of graphene oxide in 25ml of water, add 0.1g of ammonium chloride, transfer the mixture to an autoclave, raise the temperature to 220°C for 8h, and cool to room temperature. The obtained clear liquid is separated to obtain an aqueous dispersion of graphene quantum dots, which exhibits strong blue-green fluorescence under ultraviolet light.

[0030] The ammonium chloride-passivated graphene quantum dots produced by the reaction are similar in properties to the ammonia water-passivated quantum dots, with a maximum emission wavelength of 325 nm and a maximum excitation wavelength of 425 nm.

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Abstract

The invention relates to a method for preparing a graphene quantum dot. The method is mainly characterized in that the method comprises the following steps: adding an amine passivation agent in a suspension of graphene oxide dispersed in water; and then carrying out hydrothermal passivation treatment to obtain the graphene quantum dot with higher quantum yield. The method is very simple and convenient in operation and environment-friendly; the obtained quantum dot has high quantum yield; and the properties are easily regulated and controlled by changing the kinds of the passivation agents; and the method has large-scale preparation potential and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a method for preparing graphene quantum dots. This method can simply prepare graphene quantum dots with stable fluorescence, so it has broad application prospects in many fields such as optoelectronic materials, sensor devices, and biological monitoring. This method is cheap and easy to obtain, simple and convenient to operate, easy to control the preparation process, good reproducibility, and the preparation process is very environmentally friendly and pollution-free, and has very important application value. Background technique [0002] In 2005, people such as Stankovich deeply oxidized graphite to obtain graphite oxide, and then ultrasonically treated graphite oxide in water to obtain a single-layer graphite oxide sheet with a thickness of about 1 nm (Stankovich et al., Stable aqueous dispersions of graphitic nanoplatelets via the reduction of exfoliated g...

Claims

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Application Information

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IPC IPC(8): C01B31/04C09K11/65B82Y40/00C01B32/19C01B32/194
Inventor 张泽汇武培怡冯嘉春
Owner FUDAN UNIV
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