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A preparation method of carbon dots with adjustable spectral properties

A tunable, spectroscopic technology, applied in chemical instruments and methods, nanocarbons, luminescent materials, etc., which can solve problems such as limitations, setting different excitation light sources, and unfavorable mass production applications.

Active Publication Date: 2021-07-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, it is impossible to set different excitation light sources in a system, which limits the application of its adjustable fluorescence spectral properties.
At present, the methods for preparing carbon dots with adjustable fluorescence spectra usually use complex chemical synthesis methods or subsequent separation processes, which are not conducive to mass production applications

Method used

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  • A preparation method of carbon dots with adjustable spectral properties
  • A preparation method of carbon dots with adjustable spectral properties
  • A preparation method of carbon dots with adjustable spectral properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The preparation concentrations were 0.01, 0.01, 0.01, 0.01, 0.01, 0.02 and 0.04mmol / mL thiomalic acid and 0.08, 0.04, 0.02, 0.01, 0, 0.01 and 0.01mmol / mL ethylenediamine, respectively Molar ratios of 1:8, 1:4, 1:2, 1:1, 1:0, 2:1 and 4:1 were mixed and placed in microwave digestion tanks. After ultrasonic dispersion for 10 minutes, these tanks were placed in microwave In the digestion instrument, set 180°C, microwave heating for 30 minutes, open the tank after the reaction is completed, and then centrifuge the large particle sediment at a centrifugal speed of 10,000r / min for 5 minutes, and then use a 2000DKa dialysis bag to purify by dialysis with pure water for 24 hours , and dried in vacuum to obtain a series of carbon dots with different ratios of nitrogen and sulfur. The seven carbon dots prepared above were dissolved in water at a concentration of 20 mg / L, and then characterized by ultraviolet-visible spectrometer and fluorescence spectrometer, and the following res...

Embodiment 2

[0020] Weigh 0.05, 0.05, 0.05, 0.1 and 0.2mmol / mL of mercaptoacetic acid and 0.2, 0.1, 0.05, 0.05 and 0.05mmol / mL of ethanolamine, respectively feed them in a molar ratio of 1:4, 1:2, 1: 1. After mixing 2:1 and 4:1, put them into a microwave digestion tank. After ultrasonic dispersion for 15 minutes, put these tanks into a microwave digestion apparatus, set 160°C, and microwave for 30 minutes. After the reaction is over, the tanks are cooled and opened. , Centrifuge the large particle sediment at a centrifugal speed of 10000r / min for 5min, then use a 5000DKa dialysis bag to purify with pure water for 12h, and vacuum dry to obtain a series of carbon dots with different ratios of nitrogen and sulfur. Disperse the obtained five carbon dots in water at a concentration of 10mg / L, and irradiate them under a 360nm ultraviolet lamp. The fluorescent photos emitted are as follows: image 3 shown. It can be seen that as the proportion of thioglycolic acid increases, the fluorescence red...

Embodiment 3

[0022] Weigh 0.02, 0.02, 0.02, 0.04 and 0.08mmol / mL of thiopropanol and 0.08, 0.04, 0.02, 0.02 and 0.02mmol / mL of barbituric acid, respectively feed them in a molar ratio of 1:4, 1: 2. After mixing 1:1, 2:1 and 4:1, put them into a microwave digestion tank. After ultrasonic dispersion for 15 minutes, put these tanks into a microwave digestion apparatus, set 200°C, microwave for 30 minutes, and wait for the reaction to complete. After the body is cooled, it is opened, and the large-particle precipitate is centrifuged at a centrifugal speed of 12000r / min for 10min. Afterwards, a 1000DKa dialysis bag is used for dialysis and purification with pure water for 36h, and vacuum-dried to obtain a series of carbon dots with different ratios of nitrogen and sulfur. Disperse the obtained five carbon dots in water at a concentration of 10mg / L, and irradiate them under a 360nm ultraviolet lamp. It is also found that with the increase of the amount of thiopropanol, the fluorescence red shifts...

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Abstract

The invention relates to a method for preparing carbon dots with adjustable spectral properties. The method changes the ratio of nitrogen-containing precursors and sulfur-containing precursors, synthesizes them in one step by microwave hydrothermal method, and obtains a series of carbon dots with different carbon dots by means of separation and purification. Carbon dots with spectroscopic properties. The method is easy to operate, and can emit fluorescence of different colors under the excitation of the same wavelength without harsh reaction conditions or subsequent complicated treatment. This has potential application value in medical imaging, preparation of light-emitting devices and so on.

Description

technical field [0001] The invention relates to a method for preparing carbon dots, in particular to a method for preparing carbon dots with adjustable spectral properties. Background technique [0002] Carbon dots have many excellent properties, such as chemical inertness, low toxicity, biocompatibility, and stable luminescence, and thus have potential applications in photocatalysis, optoelectronics, drug delivery, sensing, and medical imaging. Among them, the property that carbon dots can emit fluorescence of different wavelengths under different excitation wavelengths has received extensive attention. However, in practical applications, it is impossible to set different excitation light sources in one system, which limits the application of its adjustable fluorescence spectral properties. At present, the methods for preparing carbon dots with adjustable fluorescence spectra usually use complex chemical synthesis methods or subsequent separation processes, which are not c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15B82Y40/00B82Y30/00C09K11/65
CPCB82Y30/00B82Y40/00C01P2006/60C09K11/65
Inventor 冯亮张雨
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI