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N, P and S-codoped fluorescent carbon quantum dot and preparation method and application thereof

A carbon quantum dot, co-doping technology, applied in fluorescence/phosphorescence, chemical instruments and methods, nano-optics, etc., can solve the unfavorable continuous and large-scale production of carbon quantum dots, carbon quantum dots with low fluorescence quantum yield and non-renewable. Energy and other issues, to achieve the effects of green price, good solubility and dispersibility, and stable optical properties

Inactive Publication Date: 2016-05-11
SHANXI UNIV
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  • Description
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  • Application Information

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Problems solved by technology

Top-down methods mainly include arc discharge, laser ablation, electrochemical oxidation, electron beam radiation, etc. These methods often require strict experimental conditions or special energy, and the cost is high. lower rate; bottom-up methods mainly include combustion method, hydrothermal carbonization method, supported synthesis method, microwave method, ultrasonic method, etc., but because the raw materials selected by such methods are all non-renewable energy and require strict post-processing technology, so it is not conducive to the continuous and large-scale production of carbon quantum dots

Method used

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  • N, P and S-codoped fluorescent carbon quantum dot and preparation method and application thereof
  • N, P and S-codoped fluorescent carbon quantum dot and preparation method and application thereof
  • N, P and S-codoped fluorescent carbon quantum dot and preparation method and application thereof

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Effect test

Embodiment 1

[0033] Preparation of N, P, S co-doped carbon quantum dots:

[0034] Step 1, weighing 0.5g of dry yeast and adding 10mL of deionized water to obtain a dispersed aqueous solution;

[0035] Step 2, transfer the mixed solution obtained in step (1) to a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 240° C. for 8 hours;

[0036] Step 3, centrifuge the product obtained in step (2) at a speed of 6000r / min for 10min, and then dialyze it for 3 days with a dialysis bag with a molecular weight cut-off of 500-1000Da to finally obtain N, P, S co-doped carbon quantum Dot the solution. Its relative quantum yield (based on quinine sulfate) is 12.54%.

[0037] Characterization and application see Figure 1-10 .

Embodiment 2

[0039] Preparation of N, P, S co-doped carbon quantum dots:

[0040] Step 1, weighing 0.5g of dry yeast and adding 10mL of deionized water to obtain a dispersed aqueous solution;

[0041] Step 2, transfer the mixed solution obtained in step (1) to a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 240° C. for 12 hours;

[0042] Step 3, centrifuge the product obtained in step (2) at a speed of 6000r / min for 10min, and then dialyze it for 3 days with a dialysis bag with a molecular weight cut-off of 500-1000Da to finally obtain N, P, S co-doped carbon quantum Dot the solution. Its relative quantum yield (based on quinine sulfate) is 12%.

Embodiment 3

[0044] Preparation of N, P, S co-doped carbon quantum dots:

[0045] Step 1, weighing 0.5g of dry yeast and adding 10mL of deionized water to obtain a dispersed aqueous solution;

[0046] Step 2, transfer the mixed solution obtained in step (1) to a hydrothermal reaction kettle, and perform a hydrothermal reaction at 160° C. for 12 hours;

[0047]Step 3, centrifuge the product obtained in step (2) at a speed of 6000r / min for 10min, and then dialyze it for 3 days with a dialysis bag with a molecular weight cut-off of 500-1000Da to finally obtain N, P, S co-doped carbon quantum Dot the solution. Its relative quantum yield (based on quinine sulfate) is 6.82%.

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Abstract

The invention provides an N, P and S-codoped fluorescent carbon quantum dot and a preparation method and application thereof, and belongs to the technical field of luminescent nanomaterials. The preparation method comprises the steps that a biological bacterium (saccharomycete or escherichia coli or staphylococcus aureus or aspergillus niger) is taken as a carbon source, water of the corresponding volume is added, and a hydrothermal reaction is performed to obtain a dark brown solution; after the reaction stops and a reaction kettle is naturally cooled, dialysis is performed to remove impurities, an aqueous carbon quantum dot solution is obtained, and after freeze drying is performed, the N, P and S-codoped fluorescent carbon quantum dot is obtained. According to the method, the biomass is taken as the carbon source, the raw material is wide in source, low in cost, green and environmentally friendly, the technology is simple, and the preparation condition requirement is low. The obtained carbon quantum dot can be applied to detection on Cr (VI) ions, MnO4<-> and ascorbic acid by serving as a switch-type fluorescent probe and also can be used for cell imaging.

Description

technical field [0001] The present invention relates to luminescent nanomaterials, in particular to carbon quantum dots, specifically a kind of N, P, S co-doped carbon quantum dots prepared by biological fungi and their use as fluorescent probes to detect Cr(VI) ions, MnO 4 - And ascorbic acid, etc., as well as the application in cell imaging. Background technique [0002] Quantum dots have received great attention and extensive research due to their superior optical and electrical properties. As quasi-zero-dimensional nanomaterials, they have superior properties such as quantum confinement effects, surface effects, and size effects. , electrical devices, biological imaging, biological drug loading and other aspects have been well applied. Traditional quantum dots are mostly researched on semiconductor quantum dots (such as CdSe, PbTe, CdTe, etc.), and their applications in the field of biomedicine, especially in dynamic tracking and imaging of cells and living bodies, hav...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01N21/64B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/701G01N21/6428
Inventor 张庆燕李增波弓晓娟董川双少敏
Owner SHANXI UNIV
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