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Synthetic method of high yield red fluorescent carbon quantum dot material

A carbon quantum dot and red fluorescence technology, which is applied in the field of high-yield red fluorescent carbon quantum dot material synthesis, can solve the problems of low yield of red light and wavelength dependence of excitation light, etc. The effect of less amount, less by-products and intermediate products

Inactive Publication Date: 2019-10-25
HUBEI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages in the prior art that the fluorescent range of carbon quantum dots is mainly concentrated in the blue-green light region, the yield of red light is low, and the wavelength of excitation light is dependent, and to provide a synthesis of high-yield red fluorescent carbon quantum dots method

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  • Synthetic method of high yield red fluorescent carbon quantum dot material
  • Synthetic method of high yield red fluorescent carbon quantum dot material
  • Synthetic method of high yield red fluorescent carbon quantum dot material

Examples

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Embodiment 1

[0030] A kind of synthetic method of high yield red fluorescent carbon quantum dot material is characterized in that comprising the following steps:

[0031] a) Weigh 1g of citric acid and 2g of urea respectively, add them into 10mL of N,N-dimethylformamide, and stir until completely dissolved to obtain a precursor solution;

[0032] b) Transfer the precursor solution obtained in step a) to a 25mL polytetrafluoroethylene-lined hydrothermal reactor to keep warm at a temperature of 180°C for 6 hours, and then naturally cool to room temperature to obtain a suspension;

[0033] c) Add 1.25mol / L LiOH aqueous solution to the suspension obtained in step b) according to the volume ratio of the suspension and the alkali solution at 1:2, stir for two minutes, centrifuge at 13000rpm, take the precipitate and add deionized water to wash After centrifugation at 13,000 rpm, the precipitate was collected, and then vacuum-dried at 60° C. to obtain red fluorescent carbon quantum dots.

[0034...

Embodiment 2

[0036] A kind of synthetic method of high yield red fluorescent carbon quantum dot material is characterized in that comprising the following steps:

[0037] a) Weigh 1g of citric acid and 2g of urea respectively, add them into 10mL of N,N-dimethylformamide, and stir until completely dissolved to obtain a precursor solution;

[0038] b) Transfer the precursor solution obtained in step a) to a 25mL polytetrafluoroethylene-lined hydrothermal reactor to keep warm at a temperature of 180°C for 6 hours, and then naturally cool to room temperature to obtain a suspension;

[0039] c) Add 1.25mol / L KOH aqueous solution to the suspension obtained in step b) according to the volume ratio of the suspension and the alkali solution at 1:2, stir for two minutes, centrifuge at 13000rpm, and take the precipitate and add deionized water to wash After centrifugation at 13,000 rpm, the precipitate was collected, and then vacuum-dried at 60° C. to obtain red fluorescent carbon quantum dots.

[0...

Embodiment 3

[0042] A kind of synthetic method of high yield red fluorescent carbon quantum dot material is characterized in that comprising the following steps:

[0043] a) Weigh 1g of citric acid and 2g of urea respectively, add them into 10mL of N,N-dimethylformamide, and stir until completely dissolved to obtain a precursor solution;

[0044] b) Transfer the precursor solution obtained in step a) to a 25mL polytetrafluoroethylene-lined hydrothermal reactor to keep warm at a temperature of 180°C for 6 hours, and then naturally cool to room temperature to obtain a suspension;

[0045] c), add 0.75mol / L NaOH aqueous solution to the suspension obtained in step b) according to the volume ratio of the suspension and the alkali solution at 1:2, stir for two minutes, centrifuge at 13000rpm, take the precipitate and add deionized water to wash After centrifugation at 13,000 rpm, the precipitate was collected, and then vacuum-dried at 60° C. to obtain red fluorescent carbon quantum dots.

[004...

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Abstract

The invention discloses a synthesis method of a high yield red fluorescent carbon quantum dot material. The synthesis method includes the steps that firstly, a carbon source and a nitrogen source areweighed respectively, added to a polar solvent N,N-dimethylformamide, and stirred until complete dissolution to obtain a precursor solution; then the precursor solution is transferred to a teflon-lined hydrothermal reactor, at the temperature of 180 DEG C, heat preservation is conducted for 6 hours and carbonization treatment is conducted, and a turbid liquid reaction product is obtained after cooling; and then after an alkali solution is added to turbid liquid for treatment, stirring, centrifugation, washing and drying are conducted to obtain the red fluorescent carbon quantum dot material. According to the synthesis method, the synthesized quantum dot material can emit red light under exciting light with the 300-600 nm wavelength, the synthesis technology and the separation and purification processes are simple, the fluorescence quantum yield is high, repeatability is strong, raw materials are cheap, and the synthesis method is suitable for large scale and volume production; and at the same time, a prepared red fluorescent carbon quantum dot by the synthesis method has a broad application prospect in preparation of a white light emitting diode (WLED) and biological detection.

Description

technical field [0001] The invention relates to the technical field of nanometer materials for photoelectric display lighting and biological detection, in particular to a synthesis method of a high-yield red fluorescent carbon quantum dot material. Background technique [0002] Quantum dot material is a semiconductor nanomaterial with excellent fluorescent properties. Its emission spectrum can change with its size, and its luminous range covers the entire visible light field. Due to its good optical properties, it has many applications in optoelectronic devices, solar cells, biomarkers and other fields. [0003] Fluorescent carbon quantum dots (CQDs), as a new type of zero-dimensional carbon-based nanomaterials, have attracted extensive attention from the scientific community in recent years. Compared with traditional semiconductor quantum dots and organic fluorescent dyes, CQDs have many unique properties, including Excellent optical properties, excellent solubility, good ...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00H01L33/50
CPCB82Y20/00B82Y40/00C09K11/65H01L33/502Y02B20/00
Inventor 潘瑞琨郭志航潘一路赵祺龚甜乐耀昌曹万强程佳吉
Owner HUBEI UNIV
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