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Preparation method and application of water-soluble efficient light-emitting graphene oxide quantum dots

A graphene quantum dot, water-soluble technology, applied in chemical instruments and methods, luminescent materials, inorganic chemistry, etc., can solve the problems of insufficient quantum efficiency of graphene quantum dots, and achieve low cytotoxicity and good cytocompatibility. Effect

Active Publication Date: 2022-02-08
HENAN UNIVERSITY
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Problems solved by technology

[0005] In order to overcome the problem of insufficient quantum efficiency of graphene quantum dots prepared by the existing method, the present invention provides an improved hummer method for producing graphene oxide, using cutting-edge ultrasonic technology to greatly improve the quantum efficiency of graphene quantum dots and graphene oxide. The conversion rate of the preparation method, obtained high-efficiency green light-emitting graphene quantum dots, and applied it to bioimaging

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  • Preparation method and application of water-soluble efficient light-emitting graphene oxide quantum dots
  • Preparation method and application of water-soluble efficient light-emitting graphene oxide quantum dots
  • Preparation method and application of water-soluble efficient light-emitting graphene oxide quantum dots

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Embodiment 1

[0040] One, the preparation of graphene oxide:

[0041] (1) Graphene oxide was prepared by the modified Hummer method. Specifically, 25 mL of concentrated sulfuric acid with a mass concentration of 98% was placed in an ice bath for 15 minutes in the flask, and ice cubes were continuously added during the ice bath. Add 500 mg of graphene microflakes into concentrated sulfuric acid to fully expand the graphene.

[0042] (2) Stir in ice bath for 30min, then slowly add 2g of potassium permanganate, at this time the solution turns from transparent to dark green. Keep stirring at 35°C for 12 h until the solution turns into a khaki thick slurry.

[0043] (3) Remove the water bath, add ultrapure water six times, 12mL each time, and then continue to stir and react at 35°C for 2h.

[0044] (4) Add 7.5 mL of 30% hydrogen peroxide by mass, and stir for 15 minutes, the solution turns golden yellow.

[0045] (5) Washing. Mix concentrated hydrochloric acid with a mass fraction of 36% to...

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Abstract

The invention belongs to the field of material preparation, and particularly relates to a preparation method of water-soluble efficient green light-emitting graphene quantum dots and application of the quantum dots in cell imaging. The preparation method comprises the following steps of: 1, preparing graphene oxide; and 2, carrying out ultrasonic treatment on the graphene oxide by using a cell crusher. The graphene oxide quantum dot solid obtained by the preparation method has good water solubility, and the quantum efficiency of the water-soluble graphene oxide quantum dots can reach 14.9%. In addition, the obtained graphene oxide quantum dots are good in cytocompatibility and low in cytotoxicity, so that the graphene oxide quantum dots can be applied to cell imaging.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a preparation method of water-soluble high-efficiency green light-emitting graphene quantum dots and the application of the quantum dots in cell imaging. Background technique [0002] Generally speaking, the particle size of graphene is roughly distributed in tens of nanometers to hundreds of nanometers and occasionally reaches the micron level. When the size of the material is smaller than its excitonic Bohr radius, the movement of electrons and holes is restricted, showing a quantum Such nanostructures are called quantum dots. Graphene quantum dots are composed of sp2 and sp3 hybridized carbon structures, and usually have a single-layer or multi-layer graphite structure. When the two-dimensional graphene microsheets are broken down to the nanometer scale, graphene exhibits semiconductor characteristics. These carbon-based quantum dots with a particle size of abo...

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Application Information

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IPC IPC(8): C01B32/198C09K11/65G01N21/64B82Y20/00B82Y40/00
CPCC01B32/198C09K11/65G01N21/6456B82Y20/00B82Y40/00
Inventor 冉霞霍翔宇潘亚涛郭立俊
Owner HENAN UNIVERSITY