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A preparation method for synthesizing sulfur-phosphorus co-doped graphene quantum dots

A graphene quantum dot and co-doping technology, which is applied in graphene, chemical instruments and methods, nanotechnology for materials and surface science, etc. problem, to achieve the effect of simple and controllable synthesis process and wide source of raw materials

Active Publication Date: 2019-12-03
JIMEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the performance control of GQDs by doping elements very limited, and it also makes it inconvenient to explain the fluorescence mechanism of doped GQDs.

Method used

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  • A preparation method for synthesizing sulfur-phosphorus co-doped graphene quantum dots
  • A preparation method for synthesizing sulfur-phosphorus co-doped graphene quantum dots
  • A preparation method for synthesizing sulfur-phosphorus co-doped graphene quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In the first step, add 0.576g of citric acid monohydrate, 0.682g of sodium phytate and 0.142g of anhydrous sodium sulfate into a 50mL container respectively, then add 20mL of deionized water, stir and dissolve to form a clear solution.

[0038] In the second step, the clear solution obtained in the first step was transferred to a 30mL polytetrafluoroethylene-lined stainless steel autoclave, and the oven temperature was set at 160°C, 170°C, 180°C, 190°C, and 200°C for hydrothermal treatment for 7 hours. , and then naturally cooled to room temperature to obtain a dark yellow solution.

[0039] In the third step, the cooled dark yellow solution was transferred from the reaction kettle to a 50 mL centrifuge tube, and centrifuged at 9000 rpm for 20 min to remove larger suspended particles.

[0040] In the fourth step, in a 25mL container, pour the centrifuged supernatant into a vacuum filtration device for suction filtration (the filter membrane adopts a 0.45 μm cellulose ac...

Embodiment 2

[0043] The first step, as embodiment 1.

[0044] In the second step, the clarified solution obtained in the first step was transferred to a 30mL polytetrafluoroethylene-lined stainless steel autoclave, and the oven temperature was set at 180°C, and the hydrothermal treatment was carried out for 4h, 5h, 6h, 7h, 8h, and 9h respectively. Then it was naturally cooled to room temperature to obtain a dark yellow solution.

[0045] The 3rd step, as embodiment 1.

[0046] The 4th step, as embodiment 1.

[0047] The 5th step, as embodiment 1.

Embodiment 3

[0049] In the first step, add citric acid monohydrate 0.192g, 0.192g, 0.384g, 0.576g, 0.768g, 0.960g, 1.152g, sodium phytate 1.364g, 0.682g, 0.682g, 0.682g, 0.682g to a 50mL container g, 0.682g and 0.142g of anhydrous sodium sulfate, then add 20mL of deionized water, stir and dissolve to form a clear solution. At this time, the molar ratios of citric acid and sodium phytate are 1:2, 1:1, 2:1, 3:1, 4:1, 5:1, and 6:1, respectively.

[0050] In the second step, the clear solution obtained in the first step was transferred to a 30mL polytetrafluoroethylene-lined stainless steel autoclave, and the oven temperature was set at 180°C for hydrothermal treatment for 7h, and then naturally cooled to room temperature to obtain a dark yellow solution.

[0051] The 3rd step, as embodiment 1.

[0052] The 4th step, as embodiment 1.

[0053] The 5th step, as embodiment 1.

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Abstract

The invention discloses a method for preparing synthetic sulfur-phosphorus co-doped graphene quantum dots and relates to preparation of nano materials. The method comprises the following steps: respectively putting citric acid monohydrate, sodium phytate and anhydrous sodium sulfate into a container, further adding deionized water, and stirring and dissolving so as to obtain a clear solution; transferring the obtained clear solution into a high-pressure kettle, performing hydrothermal treatment, and naturally cooling to a room temperature so as to obtain a dark yellow solution; transferring the obtained dark yellow solution into a centrifugal tube from the reaction kettle, and removing relatively large suspended granules through centrifugation so as to obtain supernate; performing suctionfiltration on the obtained supernate after centrifugation, and transferring the obtained yellow filtrate into a dialysis bag for dialysis; freezing the solution after dialysis, and further performingfreeze-drying on the obtained solid product, thereby obtaining the sulfur-phosphorus co-doped graphene quantum dots. The citric acid is adopted as a carbon source, the sodium phytate is adopted as a phosphorus source and the sodium sulfate is adopted as a sulfur source for the first time, and S,P-GQDs are synthesized through a simple one-step hydrothermal method.

Description

technical field [0001] The invention relates to the preparation of nanometer materials, in particular to a preparation method for synthesizing sulfur and phosphorus co-doped graphene quantum dots. Background technique [0002] Quantum dots (Quantum Dots) are quasi-zero-dimensional materials composed of a limited number of atoms, and their sizes in all three dimensions are at the nanometer level. Quantum dots are generally spherical or quasi-spherical, and because the movement of electrons inside them is restricted in all directions, the quantum confinement effect is very obvious. Most quantum dots are made of semiconductor materials, such as CdS, CdSe, CdTe, ZnSe, etc. composed of IIB-VIA elements or InP, InAs, etc. composed of IIIA-VA elements. These quantum dots have many advantages, such as high fluorescence quantum yield, good stability, and resistance to biological metabolic degradation. However, the application of most high-performance quantum dots in practical syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184B82Y30/00C09K11/70
CPCB82Y30/00C01P2002/72C01P2002/82C01P2002/84C01P2002/85C01P2004/04C01P2004/64C09K11/701
Inventor 陈晓梅王伟杰李百川
Owner JIMEI UNIV
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