Preparation method of sulfur-doped carbon quantum dot

A technology of carbon quantum dots and sulfur doping, applied in the direction of nano-carbon, nanotechnology, etc., can solve the problems of expensive preparation process and cumbersome carbon source materials, and achieve the effects of large-scale preparation, good repeatability and low reaction temperature

Inactive Publication Date: 2018-09-14
TAIYUAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0004] The present invention aims to provide a method for preparing sulfur-doped carbon quantum dots, specifically, a method for preparing carbon quantum dots based on polyvinyl alcohol, so as to solve the problem of expensive carbon source materials in the existing carbon quantum dot preparation process And the technical problems of cumbersome preparation process

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  • Preparation method of sulfur-doped carbon quantum dot
  • Preparation method of sulfur-doped carbon quantum dot
  • Preparation method of sulfur-doped carbon quantum dot

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Embodiment 1

[0020] Embodiment 1: with molecular weight being 75000, polyvinyl alcohol that alcoholysis degree is 99% is carbon source material, prepares carbon quantum dot, steps are as follows:

[0021] Step 1, preparation of carbon quantum dots: place polyvinyl alcohol with a molecular weight of 75,000 and a degree of alcoholysis of 99% in a vacuum oven at a temperature of 60°C for 24 hours; disperse the dried polyvinyl alcohol into concentrated sulfuric acid Prepare a dispersion liquid with a concentration of 1g / L in the mixture, mechanically stir at a temperature of 60°C and a rotational speed of 200rpm and continue to react for 6h to obtain a concentrated sulfuric acid dispersion of carbides, which is marked as product A;

[0022] Step 2. Washing and purification of carbon quantum dots: After diluting product A with deionized water (the mass ratio of product A to deionized water is 1:10), let it stand for 12 hours. The sulfuric acid dispersion of the obtained carbide was filtered and...

Embodiment 2

[0024] Embodiment 2: with the molecular weight being 70000, alcoholysis degree being the carboxyl modified polyvinyl alcohol of 88% as carbon source material, preparing carbon quantum dots, the steps are as follows:

[0025] Step 1, preparation of carbon quantum dots: place carboxylated polyvinyl alcohol with a molecular weight of 70,000 and a degree of alcoholysis of 88% in a vacuum oven at a temperature of 60°C for 24 hours; disperse the dried polyvinyl alcohol into Prepare a dispersion liquid with a concentration of 1 g / L in concentrated sulfuric acid, mechanically stir at a temperature of 60°C and a rotational speed of 200 rpm, and continue to react for 6 hours to obtain a concentrated sulfuric acid dispersion liquid of carbides, which is marked as product A;

[0026] Step 2. Washing and purification of carbon quantum dots: After diluting product A with deionized water (the mass ratio of product A to deionized water is 1:10), let it stand for 12 hours. The sulfuric acid di...

Embodiment 3

[0028] Embodiment 3: with molecular weight being 25000, alcoholysis degree is the polyvinyl alcohol modified by sulfonic acid group of 88% as carbon source material, prepares carbon quantum dots, and the steps are as follows:

[0029] Step 1, preparation of carbon quantum dots: placing sulfonated polyvinyl alcohol with a molecular weight of 25,000 and a degree of alcoholysis of 88% in a vacuum drying oven at a temperature of 60°C for 24 hours; dispersing the dried polyvinyl alcohol into Prepare a dispersion liquid with a concentration of 1 g / L in concentrated sulfuric acid, mechanically stir at a temperature of 60°C and a rotational speed of 200 rpm, and continue to react for 6 hours to obtain a concentrated sulfuric acid dispersion liquid of carbides, which is marked as product A;

[0030] Step 2. Washing and purification of carbon quantum dots: After diluting product A with deionized water (the mass ratio of product A to deionized water is 1:10), let it stand for 12 hours. T...

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Abstract

The invention discloses a preparation method of sulfur-doped carbon quantum dot. According to the preparation method, polyvinyl alcohol is taken as a carbon source, concentrated sulfuric acid dehydration carbonization, washing, and purifying are adopted so as to obtain the sulfur-doped carbon quantum dot; the particle size of the sulfur-doped carbon quantum dot ranges from 1 to 10nm. The preparation method comprises following steps: polyvinyl alcohol is dried, and is added into a certain amount of concentrated sulfuric acid so as to obtain a dispersion solution with a concentration ranging from 0.25 to 2g / L; mechanical stirring is carried out, and reaction is carried out for 4 to 12h at 20 to 60 DEG C; and filtering, washing, centrifugation, and drying are carried out so as to obtain the sulfur-doped carbon quantum dot powder with blue fluorescence performance. The preparation method is simple; the raw materials are low in cost; reaction consumption amount is low; and the application prospect in the field of fluorescent label and material preparation is promising.

Description

technical field [0001] The invention relates to a method for preparing sulfur-doped carbon quantum dots, belonging to the technical field of nanomaterial preparation. Background technique [0002] Carbon quantum dots are a kind of zero-dimensional carbon nanomaterials, whose particle size is usually less than 10nm, has a quasi-spherical structure, and consists of a carbonaceous core and surface functional groups. Carbon quantum dots not only have good luminescence characteristics and small size effect, but also overcome the shortcomings of metal quantum dots with high toxicity and great environmental hazards. It has good application prospects in many fields such as medical imaging technology, environmental monitoring, chemical analysis, catalyst preparation, optical device manufacturing and thin film material preparation. [0003] The current research on the synthesis method of carbon quantum dots is devoted to simple, low-cost, size-controllable and large-scale production,...

Claims

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Application Information

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IPC IPC(8): C01B32/15B82Y40/00
CPCC01B32/15B82Y40/00
Inventor 王永洪张新儒侯蒙杰刘成岑
Owner TAIYUAN UNIV OF TECH
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