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Dry preparation method of transition metal doped carbon fluorescent quantum dot

A carbon fluorescent quantum dot, transition metal technology, applied in chemical instruments and methods, nano-optics, luminescent materials, etc., can solve the problems of fluorescence quenching, rarely used, etc., and achieve enhanced fluorescence intensity, low cost, and simple operation method. 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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  • Dry preparation method of transition metal doped carbon fluorescent quantum dot
  • Dry preparation method of transition metal doped carbon fluorescent quantum dot

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] After uniformly stirring 50 mg of 1-(2-pyridylazo)-2-naphthol and 78 mg of manganese chloride hexahydrate, they were added to a polytetrafluoroethylene reactor for solvothermal reaction at a temperature of 150°C. Cool naturally after 4 hours, add 20 milliliters of distilled water and 20 milliliters of ethyl acetate, take organic phase and water phase respectively and obtain supernatant by centrifugation (12500g, 30 minutes), put into the dialysis bag of 3500kDa respectively, in 500 milliliters Distilled water (aqueous phase product) and ethanol (organic phase product) were dialyzed for 48 hours, followed by vacuum drying to obtain a solid product of manganese-doped carbon dots.

[0027] By transmission electron microscopy (see figure 1 ) shows that the manganese-doped carbon dots obtained in the experiment are uniformly dispersed nanoparticles with a particle size of 4.7 nm. The fluorescence spectrum of its aqueous product is as follows figure 2 , the fluorescence em...

Embodiment 2

[0029] After uniformly stirring 50 mg of alizarin complex indicator and 56 mg of zinc chloride hexahydrate, they were added to a polytetrafluoroethylene reactor for solvothermal reaction. Milliliters of distilled water and 20 milliliters of toluene, get organic phase and aqueous phase respectively and obtain supernatant by centrifugation (12500g, 30 minutes), put into the dialysis bag of 3500kDa respectively, in 500 milliliters of distilled water (aqueous phase product) and ethanol (organic Phase product) in dialysis treatment for 48 hours and vacuum drying to obtain a solid product of manganese-doped carbon dots. The product obtained through the detection experiment is uniformly dispersed nanoparticles with a particle size of 4.3 nanometers, which are zinc-doped carbon dots.

Embodiment 3

[0031]After uniformly stirring 216 mg of bromocresol purple indicator and 56 mg of copper chloride hexahydrate, they were added to a polytetrafluoroethylene reactor for solvothermal reaction. Milliliters of distilled water and 20 milliliters of ethyl acetate, get organic phase and aqueous phase respectively and obtain supernatant by centrifugation (12500g, 30 minutes), put into the dialysis bag of 3500kDa respectively, in 500 milliliters of distilled water (aqueous phase product) and ethanol (Organic phase product) was dialyzed in 48 hours and then vacuum-dried to obtain a solid product of copper-doped carbon dots. The product obtained through the detection experiment is uniformly dispersed nanoparticles with a particle size of 3.2 nanometers, which are copper-doped carbon dots.

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Abstract

The invention relates to a dry preparation method of transition metal doped carbon fluorescent quantum dots. According to the method, a metal chelator and transition metal salt are subjected to a thermal reaction in the absence of a solvent, and the transition metal doped carbon fluorescent quantum dots are prepared with extraction, centrifugation and dialysis methods after the reaction. 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, and the obtained carbon dots have good water solubility and wider fluorescence emission ranges. 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 dry-burning 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 optica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/65
Inventor 王昱冯亮
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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