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A kind of preparation method of n-doped carbon quantum dots and its products and applications

A technology of carbon quantum dots, which is applied in the field of preparation of N-doped carbon quantum dots, can solve the problems that carbon dots are in the preliminary stage, and achieve the effects of good water solubility, improved efficiency and high yield

Active Publication Date: 2019-06-04
南京周宁琳新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the research on the application of carbon dots in chemiluminescence is still in its preliminary stage.

Method used

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  • A kind of preparation method of n-doped carbon quantum dots and its products and applications
  • A kind of preparation method of n-doped carbon quantum dots and its products and applications
  • A kind of preparation method of n-doped carbon quantum dots and its products and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of N-doped carbon quantum dots:

[0040] Step 1, weigh 0.5g of chitosan (degree of deacetylation is 90%, viscosity is 400mPa s) powder and place it in a clean 50mL beaker, add 25mL of deionized water, and stir at 600rpm at 20°C 20min.

[0041] Step 2, transfer the colorless solution to a polytetrafluoroethylene hydrothermal reaction kettle, place it in a vacuum drying oven, and heat at a constant temperature of 200° C. for 10 h.

[0042] Step 3, after the reaction is completed, the product to be synthesized is naturally cooled to 20°C.

[0043] Step 4, the obtained yellow solution is placed in a centrifuge and centrifuged at a speed of 12000r / min for 10min, and then filtered with a 0.22μm microporous filter head to obtain a clarified carbon quantum dot solution.

[0044] Step 5, vacuum freeze-dry the obtained clear carbon quantum dot solution at a temperature of -50° C. for 24 hours and a vacuum of 9.6 Pa to obtain N-doped fluorescent carbon quantum dot po...

Embodiment 2

[0052] Preparation of N-doped carbon quantum dots:

[0053] Step 1, weigh 0.5g of chitosan (degree of deacetylation is 95%, viscosity is 50mPa s) is placed in a clean 50mL beaker, add 25mL of deionized water, and stir at 400rpm for 30min at 25°C , a colorless and transparent aqueous solution was obtained.

[0054] Step 2: Transfer the colorless solution to a polytetrafluoroethylene hydrothermal reaction kettle, place in a vacuum drying oven, and heat at a constant temperature of 200° C. for 8 hours.

[0055] Step 3, after the reaction is completed, the product to be synthesized is naturally cooled to 10°C.

[0056] Step 4, the obtained yellow solution is placed in a centrifuge and centrifuged at a speed of 12000r / min for 10min, and then filtered with a 0.22μm microporous filter head to obtain a clarified carbon quantum dot solution.

[0057] Step 5, the obtained clear carbon quantum dot solution is vacuum freeze-dried at -50°C for 24 hours and the vacuum degree is 9.6Pa to o...

Embodiment 3

[0060] Preparation of N-doped carbon quantum dots:

[0061] Step 1, weigh 0.5g of chitosan (degree of deacetylation is 90%, viscosity is 800mPa·s) is placed in a 50mL clean beaker, add 30mL of deionized water, and stir at 500rpm for 20min at 10°C , a colorless and transparent aqueous solution was obtained.

[0062] Step 2, transfer the colorless solution to a polytetrafluoroethylene hydrothermal reaction kettle, place in a vacuum drying oven, and heat at a constant temperature of 190°C for 12h.

[0063] Step 3, after the reaction is completed, the product to be synthesized is naturally cooled to 20°C.

[0064] Step 4, the obtained yellow solution is placed in a centrifuge and centrifuged at a speed of 12000r / min for 10min, and then filtered with a 0.22μm microporous filter head to obtain a clarified carbon quantum dot solution.

[0065] Step 5, vacuum freeze-dry the obtained clear carbon quantum dot solution at a temperature of -54°C for 24 hours and a vacuum of 9.6 Pa to ob...

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Abstract

The invention discloses a preparation method of N-doped carbon quantum dots, and a product and application thereof. The method comprises the following steps: dissolving chitosan in dionized water, placing in a hydrothermal reaction kettle at certain temperature to react, after a synthetic product is naturally cooled, separating, purifying, freeze drying and obtaining powder of the N-doped carbon quantum dots. Compared with other preparation method of the carbon quantum dots, the preparation method of the invention is simple in operation, only needs on raw material, needs no other surface passivating agent and is high in reaction speed, the prepared carbon quantum dots have high fluorescence and good biological compatibility, and a yield of the carbon dots reaches 45 percent. The carbon quantum dots not only can promote the growth of plants, but also can mark the plants. The application prospect in the fields of biology and agriculture is wide in the future.

Description

technical field [0001] The invention belongs to the technical field of fluorescent carbon nanomaterials, and in particular relates to a preparation method of N-doped carbon quantum dots and its products and applications. Background technique [0002] As a new member of the family of carbon nanomaterials, carbon dots have many superior fluorescent properties, such as adjustable fluorescence emission by changing the size and excitation wavelength, resistance to photobleaching, and no light flickering. Carbon is one of the important elements needed to form organisms, and the carbon dots made of it have low biotoxicity, good environmental friendliness and biocompatibility. In addition, the reaction conditions for preparing carbon dots are mild, the steps are simple, and the raw materials are abundant and cheap. The surface of carbon dots is rich in hydrophilic groups such as carboxyl groups and hydroxyl groups, and has good water solubility. The particle size of carbon dots is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00A01N59/00A01P21/00G01N21/64
CPCA01N59/00B82Y20/00B82Y40/00C09K11/65G01N21/6428
Inventor 周宁琳张明苏玉天袁平邵毛妮池铖
Owner 南京周宁琳新材料科技有限公司
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