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Preparation method of transition metal doped carbon fluorescent quantum dots

A technology of carbon fluorescent quantum dots and transition metals, applied in chemical instruments and methods, luminescent materials, nanotechnology, etc., can solve the problems of fluorescence quenching and rarely used, and achieve enhanced fluorescence intensity, low cost, and high water solubility Effect

Inactive Publication Date: 2018-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the metal ion-doped carbon dots prepared by the existing technology often suffer from fluorescence quenching, which makes this technology rarely used in the synthesis of carbon fluorescent quantum dots.

Method used

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  • Preparation method of transition metal doped carbon fluorescent quantum dots
  • Preparation method of transition metal doped carbon fluorescent quantum dots
  • Preparation method of transition metal doped carbon fluorescent quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 50 μg of 1-(2-pyridylazo)-2-naphthol in 5 mL of toluene and 78 μg of manganese chloride hexahydrate in 5 mL of deionized water, and mix the two solutions and sonicate for 5 Minutes, added to the polytetrafluoroethylene reactor for solvothermal reaction, the reaction temperature is 180 ° C, after 4 hours of reaction, it was naturally cooled to room temperature, and the organic phase and the aqueous phase were taken respectively and centrifuged (12500g, 30 minutes) to obtain the supernatant solution, respectively put into 3500kDa dialysis bags, dialyzed in 500 ml of pure water (aqueous phase product) and ethanol (organic phase product) for 48 hours and vacuum dried to obtain a solid product of manganese-doped carbon dots.

[0031] High-resolution transmission electron microscope image of manganese-doped carbon dots figure 1 As shown, the fluorescence spectrum of its aqueous phase product is as figure 2 , The fluorescence emission spectrum has two obvious peaks ...

Embodiment 2

[0033]Dissolve 43 μg of 4-(2-pyridylazo)resorcinol indicator and μg in 5 ml of toluene, dissolve 108 μg of manganese chloride hexahydrate in 5 ml of deionized water, and mix the two solutions Ultrasonic treatment at 5000Hz for 20 minutes, adding to a polytetrafluoroethylene reactor for solvothermal reaction, the reaction temperature is 200°C, and cooling naturally after 10 hours of reaction, the organic phase and the aqueous phase are taken respectively and obtained by centrifugation (12500g, 30 minutes) The supernatant was put into 3500kDa dialysis bags respectively, dialyzed in 500 ml of pure water (aqueous phase product) and ethanol (organic phase product) for 48 hours and then vacuum-dried to obtain a solid product of iron-doped carbon dots.

[0034] The fluorescence spectrum of its aqueous product is as follows image 3 , The fluorescence emission spectrum has two obvious peaks in the visible region, which are divided into 420nm and 530nm.

Embodiment 3

[0036] Dissolve 152 micrograms of xylenol orange indicator in 5 milliliters of toluene, dissolve 56 micrograms of zinc chloride in 5 milliliters of deionized water, mix the two solutions and ultrasonicate at 5000 Hz for 10 minutes, then add to polytetrafluoroethylene for reaction Carry out solvothermal reaction in the kettle, the reaction temperature is 200°C, cool naturally after 10 hours of reaction, take the organic phase and water phase respectively and obtain the supernatant through centrifugation (12500g, 30 minutes), put them into 3500kDa dialysis bags respectively, Dialyzed in 500 ml of pure water (aqueous phase product) and ethanol (organic phase product) for 48 hours and vacuum dried to obtain a solid product of zinc-doped carbon dots.

[0037] The fluorescence spectrum of its aqueous product is as follows Figure 4 , the fluorescence emission spectrum has an obvious peak at 540nm in the visible region.

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Abstract

The invention relates to a preparation method of transition metal doped carbon fluorescent quantum dots. According to the method, a metal chelator and transition metal salt are dissolved in an organicphase and water which are incompatible with each other, then, a heating reaction is conducted, concentration and purification are performed after the reaction, and transition metal doped carbon fluorescent quantum dots with different solubility are prepared. The method is convenient to operate, doping of carbon fluorescent quantum dots with metal ions can be realized without harsh reaction conditions or large instruments. The obtained carbon dots have multiple different characteristics according to different types of doping metal ions and different solvents. The prepared carbon dots have great application value in preparation of bio-labeling sensing and medical imaging, photoelectric and light-emitting devices and the like due to these characteristics.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/66B82Y40/00
CPCB82Y40/00C09K11/65C09K11/66
Inventor 王昱冯亮
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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