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Preparation method of water-soluble carbon quantum dots

A carbon quantum dot, water-soluble technology, applied in the field of preparation of water-soluble carbon quantum dots, can solve the problems of high cost, high equipment requirements, inconvenient operation, etc., and achieve the effect of simple operation

Inactive Publication Date: 2013-01-02
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

J.Xu et al. published "Carbon nanoparticles as chromosomes for photon harvesting and photoonversion, ChemPhysChem2011, 12, 3604-3608" on ChemPhysChem in 2011. This paper used pure graphite electrodes for arc discharge to prepare carbon particle raw materials, and then oxidized with strong acid Carbon quantum dots are prepared by this method, but it needs to be centrifuged at a centrifugal speed of up to 80,000rpm, which requires high equipment, high cost, and inconvenient operation

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Embodiment 1

[0026] The graphite impurity produced by the arc method to prepare single-walled carbon nanotubes is dissolved in an aqueous solution containing 1wt% sodium dodecyl sulfate (the mass ratio of the graphite impurity to the aqueous solution of sodium lauryl sulfate is 0.5: 100), and Ultrasonic dispersion was performed for 1 h, and then centrifuged at 3000 rpm, and the obtained supernatant was centrifuged at 6000 rpm, the precipitate was taken out, and the surfactant was removed by suction filtration. Mix the obtained graphite particles with sulfuric acid / nitric acid (v / v=3:1) at a ratio of 0.5ml / mg (approximately 0.01mmol / mg), and heat it to 150°C in an oil bath to carry out oxidation reflux reaction, and the reaction is carried out for 30 hours , remove the solution and dilute it 10 times with deionized water, then add NaCO 3 Neutralize until the pH value of the solution is 7, and finally dialyze the obtained solution with a dialysis bag with a cut-off of 2000 for 3 days to obta...

Embodiment 2

[0028] The graphite impurity produced when the single-walled carbon nanotube is prepared by the electric arc method is dissolved in an aqueous solution containing 1wt% sodium lauryl sulfate (the mass ratio of the graphite impurity to the aqueous solution of sodium lauryl sulfate is 0.05: 100), Ultrasonic dispersion was carried out for 1 h, and then centrifuged at 17000 rpm, the obtained supernatant was centrifuged at 20000 rpm, and the precipitate was taken out and sodium lauryl sulfate was removed by suction filtration. The obtained graphite particles were mixed with sulfuric acid / nitric acid (v / v=3:1) at a ratio of 0.5ml / mg (approximately 0.01mmol / mg), heated to 200°C in an oil bath for oxidation and reflux reaction, and the reaction was carried out for 40 hours. Take out the solution and dilute it 10 times with deionized water, then add NaOH to neutralize the solution until the pH value is 7, and dialyze the resulting solution with a dialysis bag with a cutoff of 2000 for 3 ...

Embodiment 3

[0030] Dissolve the graphite impurities produced by the arc method in the preparation of single-walled carbon nanotubes in an aqueous solution containing 1wt% sodium dodecyl sulfate, ultrasonically disperse for 1 hour, and then centrifuge at a speed of 12000rpm, and then centrifuge the obtained supernatant at a speed of 15000rpm , the precipitate was taken out and the sodium lauryl sulfate was removed by suction filtration. Mix the obtained graphite particles with concentrated nitric acid at a ratio of 0.5ml / mg (approximately 0.01mmol / mg), heat it to 150°C in an oil bath to carry out oxidation reflux reaction, and carry out the reaction for 5 hours, take out the solution and dilute it 10 times with deionized water , and then add NaOH to neutralize the solution until the pH value is 7, and use a dialysis bag with a cutoff of 3000 to obtain the water-soluble carbon quantum dots, and the particle size range is 10-15nm.

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Abstract

The invention discloses a new method for preparing water-soluble carbon quantum dots by taking graphite impurities as a raw material, and the graphite impurities are generated when a single-walled carbon nanotube is prepared by an arc process. The method comprises the steps of: adding the graphite impurities into a water solution containing a surface active agent, dispersing and centrifuging to obtain graphite particles with narrower size distribution; then, carrying out reaction between the graphite particles and a strong oxidant; adjusting the sizes of the carbon quantum dots by changing the reaction time and temperature; and finally, obtaining the water-soluble carbon quantum dots by alkali neutralization and dialysis bag separation. Compared with the prior art, the method for obtaining the carbon quantum dots by treating the graphite particles by the strong oxidant is simple in technology, and the quantum dots with different particle sizes can be obtained by controlling the size of the raw material, the experimental temperature and the reaction time; and the method is low in cost, thus being suitable for commercial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanometer materials, in particular to a method for preparing water-soluble carbon quantum dots by using graphite impurities produced during the preparation of single-walled carbon nanotubes by an electric arc method as raw materials. Background technique [0002] Since the early 1980s, Dr. Loni SBrus of Bell Labs and Dr. Alexander Efros and Dr. A.I.Ekimov of the Yoffe Institute of the former Soviet Union began to study quantum dots (Quantum Dot), and their excellent optical properties and excellent electrical properties have attracted the attention of the scientific community. It has been widely concerned and widely used in biomarkers, disease detection, semiconductor devices and solar cells and other fields. Quantum dots have a wide and continuous excitation spectrum, a narrow and symmetrical emission spectrum, and the emission spectrum can be controlled according to changing the size of t...

Claims

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Application Information

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IPC IPC(8): C01B31/02C09K11/65B82Y20/00C01B32/15
Inventor 苏言杰张亚非鲁晓楠谢敏敏魏浩
Owner SHANGHAI JIAO TONG UNIV
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