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Method for preparing carbon nanodots based on chemical cutting

A technology of carbon nano-dots and chemical cutting, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science. It can solve the problems of cumbersome steps, high-temperature equipment, and high cost, and achieve simple process and multi-color The effect of fluorescence effect

Active Publication Date: 2015-08-19
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can achieve shape control, the steps are cumbersome and high-temperature equipment is required, and the cost is high

Method used

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  • Method for preparing carbon nanodots based on chemical cutting
  • Method for preparing carbon nanodots based on chemical cutting
  • Method for preparing carbon nanodots based on chemical cutting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 0.3g waste viscose-based carbon fiber (mechanical strength 0.7GPa), wash with acetone to remove surface sizing agent and other impurities, disperse in a mixture of 20ml nitric acid and 60ml concentrated sulfuric acid, and ultrasonicate at room temperature for 2h. Reflux at 80°C for 24h, the concentrated acid mixture is equivalent to chemical scissors to cut the sheet carbon structure into small-sized carbon nano-dots. After the reaction, cool to room temperature, dilute 10 times with deionized water, neutralize with an alkaline reactant such as sodium carbonate, filter with a 0.22 μm microporous filter head, and dialyze with a 2000 Da dialysis bag for 3 days to remove salt or other impurities. An aqueous solution containing yellow fluorescent carbon nano-dots was obtained, and the product size was about 10nm. The aqueous solution of carbon nano-dots was static for 8 weeks, no insoluble matter was precipitated, and the intensity of the fluorescence spectrum remained...

Embodiment 2

[0032] Weigh 0.3g waste viscose-based carbon fiber (mechanical strength 0.68GPa), wash with acetone to remove surface sizing agent and other impurities, disperse in a mixture of 20ml nitric acid and 60ml concentrated sulfuric acid, and ultrasonicate at room temperature for 2h. Reflux at 100°C for 24h, the concentrated acid mixture is equivalent to chemical scissors to cut the lamellar carbon structure into small-sized carbon nano-dots. After the reaction, cool to room temperature, dilute 10 times with deionized water, neutralize with an alkaline reactant such as sodium carbonate, filter with a 0.22 μm microporous filter head, and dialyze with a 2000 Da dialysis bag for 3 days to remove salt or other impurities. An aqueous solution containing green fluorescent carbon nano-dots is obtained, and the size of the product is 8-12 nm. Its transmission electron microscope pictures and spectra are attached figure 2 shown. The carbon nano-dot aqueous solution was static for 8 weeks, ...

Embodiment 3

[0038]Weigh 0.3g waste viscose-based carbon fiber (mechanical strength 0.68GPa), wash with acetone to remove surface sizing agent and other impurities, disperse in a mixture of 20ml nitric acid and 60ml concentrated sulfuric acid, and ultrasonicate at room temperature for 2h. Reflux at 120°C for 24h, the concentrated acid mixture is equivalent to chemical scissors to cut the lamellar carbon structure into small-sized carbon nano-dots. After the reaction, cool to room temperature, dilute 10 times with deionized water, neutralize with an alkaline reactant such as sodium carbonate, filter with a 0.22 μm microporous filter head, and dialyze with a 2000 Da dialysis bag for 3 days to remove salt or other impurities. An aqueous solution containing blue fluorescent carbon nanodots was obtained. The size of the product was 10nm, and the aqueous solution of carbon nanodots was static for 8 weeks, no insoluble matter was precipitated, and the intensity of the fluorescence spectrum remain...

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Abstract

The present invention relates to a method for preparingg carbon nanodots based on chemical cutting, comprising dispersing waste carbon source materials in a mixed concentrated acid which plays a "chemical scissors" role during oxidation and cuts two-dimensional turbostratic structures of fiber materials into fluorescence carbon nanodots with small dimensions. Color of the carbon nanodots is adjusted by changing the reaction time and the temperature, and finally about 8-12nm carbon nanodots can be obtained after dilution, alkali neutralization and dialysis bag interception and separation. Compared with the prior art, the method for preparing carbon nanodots based on chemical cutting is simple in process, can obtain the carbon nanodots with small dimensions by controlling reaction parameters, and does not need special equipment and instruments. The carbon nanodots have stable fluorescence property and good water solubility, and present a multi-colored fluorescent effect.

Description

technical field [0001] The invention belongs to the field of preparation of carbon nano-dots, in particular to a method for preparing carbon nano-dots based on chemical cutting. Background technique [0002] Semiconductor quantum dots are usually synthesized from toxic heavy metals, and potential safety and toxicity hazards are the biggest obstacles to their application in clinical medicine. As a new type of nanomaterial, the size of carbon nanodots is less than 20nm, generally spherical or similar, showing obvious quantum confinement effect and stable fluorescence effect, especially its outstanding biocompatibility, which greatly improves the The application of carbon nanodots in biomarkers, especially in vivo imaging, is considered to be one of the most potential fluorescent materials to replace metal quantum dots. [0003] At present, the preparation methods of carbon nanodots are mainly divided into two categories: top-down and bottom-up. Many of the synthesis methods c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y30/00
Inventor 吴琪琳史燕妮陈师夏少旭程朝歌
Owner DONGHUA UNIV
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