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Transition metal-doped carbon fluorescent quantum dot preparation method

A carbon fluorescent quantum dot, transition metal technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems that have not been effectively solved, change the fluorescence emission characteristics, etc., and achieve low cost, simple operation method, and enhanced absorption intensity. Effect

Active Publication Date: 2016-11-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the problem of metal doping carbon dots to change the fluorescence emission characteristics has not been effectively solved.

Method used

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  • Transition metal-doped carbon fluorescent quantum dot preparation method
  • Transition metal-doped carbon fluorescent quantum dot preparation method
  • Transition metal-doped carbon fluorescent quantum dot preparation method

Examples

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Effect test

Embodiment 1

[0028] Dissolve 50 micrograms of 1-(2-pyridylazo)-2-naphthol and 80 micrograms of manganese chloride hexahydrate in 10 milliliters of absolute ethanol, sonicate for 5 minutes, and add them to the polytetrafluoroethylene reactor for solvent Thermal reaction, the reaction temperature is 180°C, after 4 hours of reaction, cool down naturally, add 40 ml of pure water, and after the solid is precipitated, the liquid phase is obtained by centrifugation (12500g, 30 minutes), which is the aqueous dispersion of manganese-doped carbon dots. Concentrate to 15mL by rotary evaporation (70°C, 150g) (temperature, rotation speed), put it into a 3500kDa dialysis bag, dialyze in 500ml of pure water for 48 hours and then vacuum dry to obtain a solid product of manganese-doped carbon dots.

[0029] Through transmission electron microscopy and atomic force analysis (seefigure 1 , figure 2 ) shows that the manganese-doped carbon dots obtained in the experiment are mainly structures with an average ...

Embodiment 2

[0032] Dissolve 50 micrograms of alizarin complex indicator and 80 micrograms of zinc chloride hexahydrate in 10 mL of absolute ethanol, ultrasonicate at 5000 Hz for 20 minutes, and add them into a polytetrafluoroethylene reactor for solvothermal reaction at a temperature of 200 °C After reacting for 10 hours, cool naturally, add 40 ml of pure water, and centrifuge (12500g, 30 minutes) to obtain the liquid phase after the solid is precipitated. Concentrate to 15 mL, put it into a 3500 kDa dialysis bag, dialyze in 500 mL of pure water for 48 hours, and then vacuum dry to obtain a solid product of zinc-doped carbon dots.

Embodiment 3

[0034] Dissolve 50 micrograms of bromocresol violet and 80 micrograms of ferric chloride hexahydrate in 10 mL of absolute ethanol, ultrasonicate at 16000 Hz for 5 minutes, and add them into a polytetrafluoroethylene reactor for solvothermal reaction. The reaction temperature is 180 ° C. Cool naturally after 4 hours, add 40 ml of pure water, and centrifuge (12500g, 30 minutes) to obtain the liquid phase after the solid is precipitated, which is the water dispersion of iron-doped carbon dots. 15mL was put into a 3500kDa dialysis bag, dialyzed in 500ml of pure water for 48 hours and then vacuum-dried to obtain a solid product of iron-doped carbon dots.

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Abstract

The present invention relates to a transition metal-doped carbon fluorescent quantum dot preparation method, which comprises: dissolving a metal chelating agent and a transition metal salt in an organic solvent, carrying out a solvothermal reaction, and carrying out concentration purification after the reaction to prepare the transition metal-doped carbon fluorescent quantum dots having good water solubility. According to the present invention, the operation of the method is simple, the metal ion doping on the carbon fluorescent quantum dots can be achieved without harsh reaction conditions or large instruments, such that the characteristic that the long wavelength fluorescence emission is not easily achieved by the general carbon dots can be achieved; the obtained carbon fluorescent quantum dots have characteristics of good water solubility, wide fluorescence emission range, and maximum emission wavelength change along with concretion change; and with the characteristics of the preparation method, the prepared transition metal-doped carbon fluorescent quantum dots provide great application values in the fields of biological labeling sensing and medical imaging, photoelectricity, light-emitting device preparation, and the like.

Description

technical field [0001] The invention relates to a method for preparing carbon fluorescent quantum dots, in particular to a method for preparing carbon fluorescent quantum dots doped with transition metals. Background technique [0002] As a newly emerging nano-fluorescent material, carbon fluorescent quantum dots have been extensively studied in the past ten years. Compared with the traditional semiconductor metal fluorescent quantum dots, due to the large number of groups generated during the synthesis process, such as carboxyl groups, hydroxyl groups, etc., it has excellent water solubility. In addition, because the main component is a multi-carbon skeleton, its biotoxicity and biocompatibility are greatly improved compared with traditional semiconductor metal fluorescent quantum dots. At the same time, due to the simple and diverse synthesis methods of carbon fluorescent quantum dots, a wide range of raw materials, relatively high fluorescence intensity, and the optical ...

Claims

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Application Information

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IPC IPC(8): C09K11/65
Inventor 冯亮王昱张雨贾明艳关亚风
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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