Large-scale industrial preparation method of fluorescent graphene quantum dot material

Abstract

The invention discloses a large-scale industrial preparation method of a fluorescent graphene quantum dot material. The present invention selects cheap and industrially produced pyrene as a precursor, carries out nitro functionalization on the surface of pyrene grains at low temperature, and then performs low-temperature hydrothermal dehydrogenation, growth and in-situ surface dehydrogenation under the action of sodium sulfite Functional. The quantum dots synthesized by the invention can be stably dispersed in water, have a stable structure, are resistant to acid and alkali corrosion, are non-toxic, have excellent optical properties, are small in size and are rich in sulfonic acid functional groups on the surface. The biggest highlight of the invention is that the synthesis process is simple, the reaction is extremely mild, the yield is high, the raw materials have been industrialized and are extremely cheap, environmental protection does not discharge three wastes, low energy consumption, less equipment and personnel are required, and industrialized production has been initially realized.

Description

technical field [0001] The invention relates to a preparation method of a fluorescent material, in particular to an industrial preparation method of a fluorescent graphene material, which is applied in technical fields such as biological tissue imaging and sensitized solar cells. Background technique [0002] Graphene is made of sp 2 A two-dimensional honeycomb crystal composed of hybridized carbon atoms. Because of its unique structure and properties, graphene material has quickly become the most eye-catching newcomer of carbon materials after carbon nanotubes since it was discovered in 2004. In 2010, the Nobel Prize in Physics was awarded to graphene discoverers to promote this research hotspot. Towards a new climax, high-quality graphene materials and their applications have become another scientific and technological commanding height for scientists from all over the world to compete. With the discovery of graphene, graphene quantum dots began to enter the sight of sci...

AI Technical Summary

Problems solved by technology

[0003] 1. Almost all of them are polycrystalline and highly defective in structure, so it is difficult to show the quantum size effect unique to single crystal semiconductor quantum dots;

[0004] 2. The light absorption is weak in the visible light region, and the fluorescence quantum yield is low, so the fluorescent bright spots of single particles are weak;

[0005] 3. The size of quantum dots is difficult to precisely control, showing polydispersity, so the fluorescence spectrum is very broad;

However, various methods reported so far, such as top-down chemical cutting method and bottom-up growth fusion method, are difficult to prepare such high-quality single-crystal graphene quantum dots, especially at the large-scale level.

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