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A method for electrolytically preparing multicolor fluorescent graphene quantum dots in the same electrolytic cell

A technology of graphene quantum dots and fluorescence, which is applied in the direction of electrolytic components, electrolytic process, nanotechnology, etc., to achieve the effect of product stability, strong repeatability and simple operation

Active Publication Date: 2020-04-21
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no relevant patent report in China

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  • A method for electrolytically preparing multicolor fluorescent graphene quantum dots in the same electrolytic cell
  • A method for electrolytically preparing multicolor fluorescent graphene quantum dots in the same electrolytic cell
  • A method for electrolytically preparing multicolor fluorescent graphene quantum dots in the same electrolytic cell

Examples

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Embodiment 1

[0028] Embodiment 1: Preparation of red fluorescent graphene quantum dot solution by electrochemical method

[0029] With graphite rods (purity 99.999%) as anode and cathode, preferably 50mL of 0.005mol / L (NH 4 ) 2 S 2 o 8 and 0.1mol / L KOH, where, n(KOH):n((NH 4 ) 2 S 2 o 8) of 0.2:1, 0.4:1, and 0.6:1 were used as the electrolyte, and the operating voltage was 25V and the electrolysis time was 90min to obtain quantum dot electrolytes under different conditions. Then, a polytetrafluoroethylene microporous filter membrane with a pore size of 0.22 μm is used as a vacuum filter membrane, and larger solid particles in the intercepted solution are vacuum filtered to obtain a graphene quantum dot solution. The filtrate was dialyzed in a dialysis bag with a molecular weight cut-off of 3500Da for 2 days to neutrality, and sulfate ions, peroxodisulfate ions, bisulfate ions, ammonium ions and other ions in the solution were removed to obtain a graphene quantum dot dialysate. The ...

Embodiment 2

[0036] Embodiment 2: Preparation of green fluorescent graphene quantum dot solution by electrochemical method

[0037] Preferably 50mL of 0.01mol / L (NH 4 ) 2 S 2 o 8 and 1mol / L KOH, where, n(KOH):n((NH 4 ) 2 S 2 o 8 ) were respectively 0.8:1, 1:1, 1.2:1, 1.4:1, 1.5:1 solutions were used as the electrolyte for experiments, and the operating voltage was 30V and the electrolysis time was 60min. The rest of the operating conditions and processes were the same as in Example 1 .

[0038] The ultraviolet fluorescence test and analysis of the quantum dot solutions obtained from different proportions of electrolytes revealed that the solution emitted green fluorescence, and the peak position was at λ=520nm, and there were no peaks at other positions. Compared with Example 1, the position of the fluorescence peak in Example 2 shifted blue, and the fluorescence color changed to green, indicating that the fluorescence color of graphene quantum dots can be changed by adjusting the ...

Embodiment 3

[0040] Embodiment 3: Preparation of blue fluorescent graphene quantum dot solution by electrochemical method

[0041] Preferably 50mL of 0.1mol / L (NH 4 ) 2 S 2 o 8 and 2mol / L KOH, where, n(KOH):n((NH 4 ) 2 S 2 o 8 ) were 1.6:1, 2.0:1, 3.0:1, 4.0:1 solutions were used as the electrolyte for experiments, the operating voltage was 35V and the electrolysis time was 30min, and the rest of the operating conditions and processes were the same as those in Examples 1 and 2.

[0042] The ultraviolet fluorescence test and analysis of the quantum dot solutions obtained by different proportions of electrolytes revealed that the solution emitted blue fluorescence, and the peak position was at λ=455nm, and there were no peaks at other positions. Compared with Examples 1 and 2, the fluorescence peak position of Example 3 is further blue-shifted, and the fluorescence color becomes blue, indicating that the preparation of multicolor fluorescent graphene quantum dots can be realized by ad...

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Abstract

The invention relates to a method for electrolytic preparation of multi-color fluorescence graphene quantum dots in one electrolytic cell. By means of the method, the graphene quantum dots capable ofemitting multiple colors are prepared through electrochemistry in the one electrolytic cell; and according to the preparing method, a direct current stabilized power supply is used as a working supply, graphite rods with the purity being 99.999% are used as an anode and a cathode, and an electrochemical oxidation electrolytic method is adopted for achieving preparation of the graphene quantum dotscapable of emitting red fluorescence by adjusting the voltage in a (NH4)2S2O8 aqueous solution. The KOH solution adding quantity is controlled, regulation from red light to green light to blue lightis achieved through the one electrolytic cell, the prepared multi-color graphene quantum dots can be applied to fluorescence detection, biosensors, metal ion detection and other fields.

Description

technical field [0001] The invention relates to a method for preparing multicolor fluorescent graphene quantum dots, specifically referring to preparing graphene quantum dots capable of emitting different fluorescent colors in the same electrolytic cell by an electrochemical method. The graphene quantum dots can be applied in bioluminescent imaging, bioluminescent labeling, metal ion detection, etc., and belong to the field of nanomaterial preparation and application. Background technique [0002] Graphene Quantum Dots (Graphene Quantum Dots) are generally within 10 nm in size and have a graphene structure of one, two or several layers. Since 2010, Wu Minghong's research group cut graphene sheets by hydrothermal method for the first time to obtain blue-emitting graphene quantum dots [Adv.Mater.2010,22,734–738.], which quickly attracted widespread attention . Compared with traditional semiconductor quantum dots, graphene quantum dots can exhibit unique photochemical propert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00B82Y40/00
CPCB82Y40/00C25B1/00
Inventor 郑华均管灵通李天柱
Owner ZHEJIANG UNIV OF TECH
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