A kind of preparation method of graphene quantum dot

A technology of graphene quantum dots and mass ratio, applied in graphene, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve problems such as low yield, unavailable raw materials, cumbersome preparation process, etc. Achieve the effect of high yield, fast preparation process and simple conditions

Active Publication Date: 2015-12-30
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method can better control the size and shape of the prepared graphene quantum dots, but has the disadvantages of unavailable raw materials, cumbersome preparation process, and low yield.

Method used

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  • A kind of preparation method of graphene quantum dot
  • A kind of preparation method of graphene quantum dot
  • A kind of preparation method of graphene quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Add 50g of polytetrafluoroethylene (PTFE, 2μm) and 14g of Si powder (100nm) into cyclohexane at room temperature, stir magnetically for 1 hour to make it evenly mixed, and place it in a closed explosive device after vacuum drying; The ignition method triggers a deflagration reaction. After the reaction, the obtained carbon product is collected, and then placed in a muffle furnace for heat treatment at 300°C to remove unreacted PTFE and NaOH concentrated solution at 50°C to remove unreacted Si. After cooling, The product is repeatedly and alternately washed with ethanol and water, and dried in a vacuum oven to obtain graphene quantum dot polymerized nanoparticles.

[0049] Graphene quantum dot polymerized nanoparticles were exfoliated by the Hummer method to prepare graphene oxide quantum dots. The specific steps were: weigh 0.5g graphene quantum dot polymerized nanoparticles, add 12mL concentrated sulfuric acid and 1.5g potassium permanganate under ice bath conditions ,...

Embodiment 2

[0054] Add 50g of polytetrafluoroethylene (PTFE, 2μm) and 42g of Si powder (100nm) into cyclohexane at room temperature, stir magnetically for 1 hour to make it evenly mixed, and place it in a closed explosive device after vacuum drying; other steps With embodiment 1.

[0055] Figure 10 It is a high-resolution transmission electron microscope photo of the prepared graphene quantum dot polymerized nanoparticles. It can be seen from the photo that the carbon material prepared by the deflagration method is composed of graphene quantum dots, with a size of about 20nm and a thickness of about 5 layer graphite structure.

Embodiment 3

[0057] Add 50g polytetrafluoroethylene (PTFE, 300nm) and 14g Si powder (100nm) into cyclohexane at room temperature, stir magnetically for 1 hour to make it evenly mixed, and place it in a closed explosive device after vacuum drying; other steps With embodiment 1.

[0058] Figure 11 It is a high-resolution transmission electron microscope photo of the prepared graphene quantum dot polymerized nanoparticles. From the photo, it can be seen that the graphene quantum dot prepared by reducing the size of the reactant has a slightly larger size, about 50nm, and a thickness of about It is a 15-layer graphite structure, which may be due to the small size of the reactant ions leading to an increase in the reaction rate, resulting in an increase in the temperature of the deflagration flame and a prolongation of the growth process of carbon atoms, so that the size of the grown graphene quantum dots has a increased.

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Abstract

The invention relates to a preparation method of a graphene quantum dot. The preparation method comprises the following steps: I, adding polytetrafluoroethylene and silicon powder in a certain weight ratio into cyclohexane at room temperature, uniformly mixing, drying and placing in a sealed exploder; II, initiating a deflagration reaction, collecting a reaction product after reaction, removing unreacted polytetrafluoroethylene and silicon powder, cooling, cleaning the product and drying to obtain graphene quantum dot polymerized nano particles; and III, stripping the obtained graphene quantum dot polymerized nano particles to obtain the graphene quantum dot. The preparation method of the graphene quantum dot provided by the invention is simple and convenient, simple in equipment used and short in time consumed, can be prepared on a large scale within a short time and is convenient for industrialized production.

Description

technical field [0001] The invention relates to the synthesis of an inorganic nanometer material, in particular to a preparation method of graphene quantum dots. Background technique [0002] Graphene quantum dots (graphene quantum dots, GQDs) exhibit strong quantum confinement effects and boundary effects due to their size below 10nm, so they are very attractive in many fields such as solar optoelectronic devices, biomedicine, light-emitting diodes and sensors. application prospects. So far, researchers at home and abroad have researched and developed many methods for preparing graphene quantum dots. In general, two broad categories can be distinguished: top-down and bottom-up approaches. The top-down approach can be viewed as a dicing and exfoliation process of carbon materials, mainly involving photolithography of graphene [see: Ponomarenko L.A.; Schedin F.; Katsnelson M.I.; Yang R.; Hill E.W.; Novoselov K .S.; GeimA.K.ChaoticDiracBilliardinGrapheneQuantumDots.Science2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04C09K11/65B82Y30/00C01B32/184
Inventor 杨光成刘有松沈金朋李瑞杨云涛
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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