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Graphene quantum dot, application thereof and method for preparing graphene quantum dot under microwave assistance

A graphene quantum dot and microwave-assisted technology, which is applied in the fields of light-emitting diode devices, biological imaging, and fluorescent nanomaterials, can solve problems such as low color temperature, low color rendering index, and color temperature drift that are difficult to achieve, and achieve good biocompatibility, Strong fluorescence, good imaging effect

Inactive Publication Date: 2019-04-09
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current white LEDs still have YAG phosphor aging over time, resulting in color temperature drift and shortened life; at the same time, it is difficult to achieve low color temperature (white light tends to warm white light), and low color rendering index (70-80) and other problems

Method used

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  • Graphene quantum dot, application thereof and method for preparing graphene quantum dot under microwave assistance
  • Graphene quantum dot, application thereof and method for preparing graphene quantum dot under microwave assistance
  • Graphene quantum dot, application thereof and method for preparing graphene quantum dot under microwave assistance

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Embodiment 1

[0031] In this embodiment, a graphene quantum dot is composed of a few nano-scale graphene nanosheets with the number of layers not greater than 5, and some of the graphene nanosheets contain hydroxyl groups connected to edge carbon atoms; The average diameter of the graphene quantum dots is 3.3 nm, the average thickness of the graphene quantum dots is 1.8 nm, and the graphene quantum dots contain four elements of C, N, O, and H.

[0032] A method for preparing graphene quantum dots under the assistance of microwave, which is characterized in that it comprises the following steps:

[0033] a. Using 1,3,6-trinitropyrene as the precursor, under ultrasonic conditions, disperse 0.05g of 1,3,6-trinitropyrene in 5mL of water to form a precursor solution, and then use 500μL of 1M NaOH solution with a molar concentration of 1M, adjust the pH of the precursor solution to alkaline; continue ultrasonic dispersion to mix the alkaline precursor solution; then transfer the alkaline precursor sol...

Embodiment 2

[0036] This embodiment is basically the same as the first embodiment, and the special features are:

[0037] In this embodiment, a method for preparing graphene quantum dots under the assistance of microwaves is characterized in that it includes the following steps:

[0038] a. Using 1,3,6-trinitropyrene as the precursor, under ultrasonic conditions, disperse 0.05g of 1,3,6-trinitropyrene in 5mL of water to form a precursor solution, and then use 500μL of 1M hydrazine hydrate solution with a molar concentration of 1M, adjust the pH of the precursor solution to be alkaline; continue ultrasonic dispersion to mix the alkaline precursor solution; then transfer the alkaline precursor solution to a volume of 10mL In a microwave reaction tube made of quartz material, the reaction is carried out in Anton Paar's microwave 400 instrument, under the condition that the alkaline precursor solution is used as the reaction liquid system at a temperature of 180 ℃ and microwave is applied, and the ...

Embodiment 3

[0043] This embodiment is basically the same as the previous embodiment, and the special features are:

[0044] In this embodiment, a method for preparing graphene quantum dots under the assistance of microwaves is characterized in that it includes the following steps:

[0045] a. Using 1,3,6-trinitropyrene as the precursor, 0.02g of 1,3,6-trinitropyrene was uniformly dispersed in 10mL of water under ultrasonic conditions to form a precursor solution, and then used NaOH solution with a molar concentration of 0.1M, adjust the pH of the precursor solution to 9; continue ultrasonic dispersion to mix the alkaline precursor solution; then transfer the alkaline precursor solution to a quartz material with a volume of 10 mL In the microwave reaction tube, the reaction is carried out in the Anton Paar Microwave 400 instrument. The conditions are: at a temperature of 120 ℃, under the condition of applying microwave, the alkaline precursor solution is used as the reaction liquid system, and ...

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Abstract

The invention discloses a graphene quantum dot, application thereof and a method for preparing the graphene quantum dot under microwave assistance. By adopting the bottom-up preparation method, smallmolecule 1,3,6-trinitropyrene serving as a precursor is used for quickly synthesizing the graphene quantum dot under an alkaline condition. The graphene quantum dot can be applied to biological cell imaging and warm white LEDs as a fluorescent probe. The method for preparing the graphene quantum dot has short preparation cycle, can be used for preparing the graphene quantum dot with stable fluorescence even in 3 minutes, and has simple synthesizing method, short cycle and high repeatability. The graphene quantum dot is uniform and stable, has strong fluorescence and high quantum yield, and hasan important application in the fields of warm white LED and biological probes.

Description

Technical field [0001] The invention relates to a nano material, its application and preparation method, in particular to a graphene material, its application and preparation method, which is applied to the technical field of fluorescent nano material, and applied to light emitting diode (LEDs) devices and biological imaging technology field. Background technique [0002] Quantum dots are spherical or quasi-spherical nanoparticles composed of a limited number of atoms and all three dimensions are below 100nm. The size of quantum dots is generally between 1 and 20 nm. Due to the quantum confinement effect, the continuous energy band structure becomes a discrete energy level structure with molecular characteristics. After it absorbs all photons higher than its band gap energy, it can emit fluorescence. Based on quantum effects, quantum dots have broad application prospects in light-emitting devices and biological probes. [0003] The reported preparation methods of graphene quantum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184B82Y30/00C09K11/65H01L33/50G01N15/10
CPCB82Y30/00C01B2204/20C01B2204/32C09K11/65C01B32/184G01N15/10G01N2015/1006H01L33/502Y02B20/00
Inventor 王亮李伟涛刘一健韩禹潘登余吴明红
Owner SHANGHAI UNIV
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