Green-orange-red three-color fluorescent graphene quantum dot preparation method

A graphene quantum dot, green-orange-red technology, applied in graphene, chemical instruments and methods, luminescent materials, etc., can solve problems such as limiting the application of long-wavelength fluorescent graphene quantum dots, and achieve industrialization promotion, excellent optical properties, The effect of easy separation and purification

Active Publication Date: 2017-03-29
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there has been no breakthrough in the synthesis technology of graphene quantum dots with high-efficiency long-wavelength fluorescence (green, orange, red), which limits the application of long-wavelength fluorescent graphene quantum dots in many technical fields.

Method used

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  • Green-orange-red three-color fluorescent graphene quantum dot preparation method
  • Green-orange-red three-color fluorescent graphene quantum dot preparation method
  • Green-orange-red three-color fluorescent graphene quantum dot preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Preparation of graphene quantum dots with red fluorescence

[0030] The specific preparation steps of this embodiment are as follows:

[0031] (1) At room temperature, measure 240 ml of concentrated nitric acid and 80 ml of concentrated sulfuric acid and add them to a 500 ml round bottom flask, and stir evenly;

[0032] (2) Weigh 4 g of pyrene, add pyrene to the mixed acid under stirring, nitrate and reflux in an oil bath at 80°C for 24-48 h, take it out after cooling;

[0033] (3) Slowly add the reactants obtained in the above steps into 2000 ml of deionized water, filter with a water filter to remove the acid solution, then wash with water until the filtered solution is neutral, and dry the obtained solid in vacuum at 60 °C for 48 h. remove water;

[0034] (4) Then take the dried solid and add it to 40 ml N,N-dimethylformamide and ultrasonically disperse it for 2 h to form a uniform suspension, then immediately put 40 ml of the suspension into 80 ml polyte...

Embodiment 2

[0036] Example 2 Preparation of graphene quantum dots with orange fluorescence

[0037] The specific preparation of this embodiment is as follows:

[0038] (1) At room temperature, measure 240 ml of concentrated nitric acid and 80 ml of concentrated sulfuric acid and add them to a 500 ml round bottom flask, and stir evenly;

[0039] (2) Weigh 4 g of pyrene, add pyrene to the mixed acid under stirring, nitrate and reflux in an oil bath at 80°C for 24-48 h, take it out after cooling;

[0040] (3) Slowly add the reactants obtained in the above steps into 2000 ml of deionized water, filter with a water filter to remove the acid solution, then wash with water until the filtered solution is neutral, and dry the obtained solid in vacuum at 60 °C for 48 h. remove water;

[0041] (4) Then add the dried solid to 40 ml of toluene and ultrasonically disperse it for 2 h to form a uniform suspension, then immediately put 40 ml of the suspension into a 80 ml polytetrafluoroethylene-lined r...

Embodiment 3

[0043] Example 3 Preparation of graphene quantum dots with green fluorescence

[0044] The specific preparation of this embodiment is as follows:

[0045] (1) At room temperature, measure 240 ml of concentrated nitric acid and 80 ml of concentrated sulfuric acid and add them to a 500 ml round bottom flask, and stir evenly;

[0046] (2) Weigh 4 g of pyrene, add pyrene to the mixed acid under stirring, nitrate and reflux in an oil bath at 80°C for 24-48 h, take it out after cooling;

[0047] (3) Slowly add the reactants obtained in the above steps into 2000 ml of deionized water, filter with a water filter to remove the acid solution, then wash with water until the filtered solution is neutral, and dry the obtained solid in vacuum at 60 °C for 48 h. remove water;

[0048] (4) Then take the dried solid and add it to 40 ml of ethanol and ultrasonically disperse it for 2 h to form a uniform suspension, then immediately put 40 ml of the suspension into a 80 ml polytetrafluoroethyl...

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Abstract

The present invention relates to a green-orange-red three-color fluorescent graphene quantum dot preparation method, wherein cheap pyrene is selected as a precursor and is nitrified at a low temperature to obtain an intermediate 1,3,6-trinitro pyrene, and low temperature solvothermal dehydrogenation, growth and in situ surface functionalization are performed under the effect of different solvents and different concentrations of a catalyst acetic acid. According to the present invention, the synthesized quantum dots can be stably dispersed in various organic solvents, the light emitting color or wavelength can be adjusted within 510-620 nm, and the fluorescence efficiency is high; and the synthesized quantum dot material provides attractive application prospects in the high and new technology fields of environmental protection, bio-nanotechnology, new energy sources, nanometer devices and the like, and the synthesis method has characteristics of simpleness, environmental protection and low energy consumption, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of green-orange-red three-color fluorescent graphene quantum dots. Background technique [0002] Graphene, as a single-atom-thick two-dimensional carbon material, has attracted extensive attention from researchers at home and abroad in the past decade due to its special thermal, mechanical and electrical properties. In addition to the extraordinary properties of graphene, graphene quantum dots also have the unique optical properties of quantum dots. Compared with other semiconductor quantum dots, they have abundant raw materials, low price, good chemical stability, strong resistance to photobleaching, and biological safety. High, environment-friendly and other advantages. These characteristics make it have potential application value in the fields of solar cells, light-emitting devices, bioimaging and targeted drug delivery. [0003] The synthesis methods of graphene quantum dots can be divided into two c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C09K11/65
CPCC01P2002/72C01P2002/78C01P2002/82C01P2002/84C01P2004/04C01P2004/64C01P2006/60C09K11/65
Inventor 潘登余吴明红湛晶耿弼江王亮
Owner SHANGHAI UNIV
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