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Preparing methods of carbon quantum dots and phosphorescence composite material of carbon quantum dots

A technology of carbon quantum dots and composite materials, which is applied in the field of preparation of luminescent carbon nanomaterials, can solve the problems of unsatisfactory fluorescence quantum efficiency of carbon quantum dots, insufficient phosphorescence performance of phosphorescent composite materials, complicated preparation conditions and synthesis process, etc., and achieves excellent results. Room temperature phosphorescence performance, strong design, high fluorescence quantum efficiency effect

Active Publication Date: 2019-04-19
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the main phosphorescent composite materials are concentrated on inorganic compounds and metal complexes. Although these materials have high phosphorescence efficiency and long phosphorescence relaxation time, they often require complex preparation conditions and synthesis processes, and the cost is high. Poor compatibility, single type of material
Carbon quantum dots are a new type of carbon nanomaterials, but the existing carbon quantum dots have unsatisfactory fluorescence quantum efficiency and poor water solubility. The phosphorescent composite materials prepared by using them have insufficient phosphorescence performance and short life

Method used

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  • Preparing methods of carbon quantum dots and phosphorescence composite material of carbon quantum dots
  • Preparing methods of carbon quantum dots and phosphorescence composite material of carbon quantum dots
  • Preparing methods of carbon quantum dots and phosphorescence composite material of carbon quantum dots

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Embodiment 1

[0032] (1) Preparation of carbon quantum dots

[0033] Tetrahydrofuran heat treatment: take 180ml of tetrahydrofuran in a polytetrafluoroethylene hydrothermal kettle, and react at 120°C for 120min.

[0034] Weigh 20 mg of 3,5-diaminobenzoic acid and dissolve it in a mixed solvent of heat-treated tetrahydrofuran and water at a volume ratio of 1:1 to prepare a mixed solution with a monomer concentration of 0.1 mg / mL. Add hydrochloric acid with a volume fraction of 0.01%, and mix well. The mixed solution was stirred at room temperature for 72 h. The above solution was then concentrated and excess impurities and unreacted starting materials were removed by column chromatography. Finally, solid powder of carbon quantum dots was obtained by freeze-drying.

[0035] (2) Preparation of phosphorescent composite materials

[0036] The prepared carbon quantum dots are added into the polyacrylic acid aqueous solution at a mass fraction of 0.02%, and the obtained product can be freeze-d...

Embodiment 2

[0039] (1) Preparation of carbon quantum dots

[0040] Tetrahydrofuran heat treatment: take 180ml tetrahydrofuran in a polytetrafluoroethylene hydrothermal kettle, and react at 130°C for 150min.

[0041] Weigh 20 mg of 3,5-diaminobenzoic acid and dissolve it in heat-treated tetrahydrofuran to prepare a mixed solution with a monomer concentration of 5 mg / mL. Add sulfuric acid with a volume fraction of 0.01%, and mix well. The mixed solution was stirred at room temperature for 24 h. The above solution was then concentrated and excess impurities and unreacted starting materials were removed by column chromatography. Finally, solid powder of carbon quantum dots was obtained by freeze-drying.

[0042] (2) Preparation of phosphorescent composite materials

[0043] The prepared carbon quantum dots are added into an aqueous solution of polyacrylamide at a mass fraction of 0.2%, and the obtained product is dried at 120° C. to obtain a carbon quantum dot-based room-temperature phosp...

Embodiment 3

[0045] (1) Preparation of carbon quantum dots

[0046] Tetrahydrofuran heat treatment: take 180ml of tetrahydrofuran in a polytetrafluoroethylene hydrothermal kettle, and react at 120°C for 120min.

[0047] Weigh 20 mg of 2,4-diaminobenzenesulfonic acid and dissolve it in a mixed solvent of heat-treated tetrahydrofuran and methanol at a volume ratio of 5:1 to prepare a mixed solution with a monomer concentration of 1 mg / mL. Add phosphoric acid with a volume fraction of 0.001%, and mix well. The mixed solution was stirred at room temperature for 96 h. The above solution was then concentrated and excess impurities and unreacted starting materials were removed by column chromatography. Finally, solid powder of carbon quantum dots was obtained by freeze-drying.

[0048](2) Preparation of phosphorescent composite materials

[0049] The prepared carbon quantum dots are added into an aqueous solution of polymaleic acid at a mass fraction of 1%, and the obtained product can be fre...

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Abstract

The invention discloses preparing methods of carbon quantum dots and a phosphorescence composite material of the carbon quantum dots. The carbon quantum dots are synthesized through aniline monomers such as 3,5-diaminobenzoic acid, 2,4-diaminobenzenesulfonic acid and 2,6-diaminotoluene under the room-temperature condition. The composite material is compounded by the water-soluble carbon quantum dots and a hydrophilic poymer such as polyacrylic acid, sodium polyacrylate, polyacrylamide, polymaleic anhydride, polymaleic acid and sodium polystyrenesulfonate. The preparing technology is simple, the raw materials are easy to obtain, the cost is low, and the preparing method is poisonless and environmentally friendly. The carbon quantum dots are diversified, and have the advantages of being highin fluorescence quantum efficiency, good in water solubility and the like; the phosphorescence composite material is diversified, long in phosphorescence service life at the room temperature, and excellent in phosphorescence performance and has a huge application prospect in the fields of counterfeiting prevention, display, biological and chemical detection and the like.

Description

technical field [0001] The invention relates to a preparation method of a luminescent carbon nanometer material, in particular to a preparation method of a carbon quantum dot and a phosphorescent composite material thereof. Background technique [0002] Phosphorescent composite materials are widely used in optoelectronic devices, anti-counterfeiting technology, biochemical detection and other fields. At present, the main phosphorescent composite materials are concentrated on inorganic compounds and metal complexes. Although these materials have high phosphorescence efficiency and long phosphorescence relaxation time, they often require complex preparation conditions and synthesis processes, and the cost is high. Poor compatibility, single type of material. Carbon quantum dots are a new type of carbon nanomaterials, but the existing carbon quantum dots have unsatisfactory fluorescence quantum efficiency and poor water solubility, and the phosphorescent composite materials pr...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/65
CPCC09K11/025C09K11/65
Inventor 袭锴苟慧琳刘彦峰黄新
Owner NANJING UNIV
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