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Preparation method of graphene oxide quantum dots

A graphene quantum dot and quantum dot solution technology, which is applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc. Simple, high-purity, and excellent fluorescence results

Active Publication Date: 2016-01-20
中科悦达(上海)材料科技有限公司
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Problems solved by technology

[0008] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a method for preparing graphene oxide quantum dots, which is used to solve the problems in the prior art that the preparation process of graphene oxide quantum dots is complicated and the raw materials are difficult to obtain.

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  • Preparation method of graphene oxide quantum dots
  • Preparation method of graphene oxide quantum dots
  • Preparation method of graphene oxide quantum dots

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preparation example Construction

[0033] refer to figure 1 , the preparation method of graphene oxide quantum dot provided by the invention comprises:

[0034] Step S10: Mixing citric acid into concentrated sulfuric acid to form a mixed solution of citric acid and concentrated sulfuric acid.

[0035] Step S20: reacting the mixed solution of citric acid and concentrated sulfuric acid under normal pressure to form a first graphene oxide quantum dot solution.

[0036] In a specific embodiment, the preparation method of the graphene oxide quantum dots also includes:

[0037] Step S30: removing impurities from the first graphene oxide quantum dot solution.

[0038] Step S40: drying to obtain graphene oxide quantum dot powder.

[0039] Concrete, the preparation method of described graphene oxide quantum dot provided by the present invention can be:

[0040] First, step S10 is performed: mixing citric acid and concentrated sulfuric acid to form a mixed solution of citric acid and concentrated sulfuric acid.

[0...

Embodiment 1

[0063] Add 30mg of citric acid and 30mL of concentrated sulfuric acid to the round bottom flask successively, stir in a water bath at 50°C for 5h, and obtain a graphene oxide quantum dot solution after cooling. Slowly add 24g NaOH to the above solution, stir quickly, adjust the pH to 6.5, then place the solution in a 3000D ultrafiltration centrifuge tube, centrifuge at 8000r / min for 20min, and redisperse the filter residue in deionized water to obtain high-purity graphene oxide Quantum dot aqueous solution. Finally, the above solution was freeze-dried at -40°C and 1Pa to obtain fluffy graphene oxide quantum dot powder. image 3 It is a high-resolution TEM image of the graphene oxide quantum dots obtained in this embodiment. Figure 4 Luminescence diagram of the aqueous solution of graphene oxide quantum dots obtained in this embodiment under 325nm light. Figure 5 It is the graphene oxide quantum dot fluorescence spectrogram obtained in the present embodiment, wherein, Fig...

Embodiment 2

[0065] Add 50 mg of citric acid and 40 mL of concentrated sulfuric acid to the round bottom flask successively, stir in a water bath at 70°C for 7 hours, and obtain a graphene oxide quantum dot solution after cooling. Slowly add 34g NaOH to the above solution, stir quickly, adjust the pH to 7, then place the solution in a 3000D ultrafiltration centrifuge tube, centrifuge at 8000r / min for 20min, and redisperse the filter residue in deionized water to obtain high-purity graphene oxide Quantum dot aqueous solution. Finally, the above solution was freeze-dried at -40°C and 1Pa to obtain fluffy graphene oxide quantum dot powder.

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Abstract

The invention provides a graphene oxide quantum dot preparation method. The graphene oxide quantum dot preparation method comprises the following steps that citric acid and concentrated sulfuric acid are mixed and undergo a reaction under normal pressure to produce a graphene oxide quantum dot solution. The graphene oxide quantum dot preparation method has the advantages of simple processes, easy acquisition of raw materials, easy realization of technical conditions and short time consumption.

Description

technical field [0001] The invention relates to the technical field of new inorganic materials, in particular to a method for preparing graphene oxide quantum dots. Background technique [0002] Graphene quantum dots are zero-dimensional graphene with lateral dimensions less than 100nm, and are an emerging carbon nanomaterial. Compared with conventional large-size two-dimensional graphene sheets, graphene quantum dots have significant edge effects and quantum confinement effects, thus exhibiting excellent optical and electrical properties. Compared with traditional carbon quantum dots and rare earth metal oxide quantum dots, graphene quantum dots have good water solubility, stable and tunable photoluminescence properties, low cytotoxicity and excellent biocompatibility. These performance advantages make graphene quantum dots have very broad application prospects in many fields such as optoelectronic materials and devices, electrocatalysis, electrochemical biosensing, and bi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04C09K11/65B82Y40/00B82Y30/00
Inventor 何朋丁古巧谢晓明江绵恒
Owner 中科悦达(上海)材料科技有限公司
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