Photoinduced carbon quantum dot and preparation method thereof

A carbon quantum dot, photoinduced technology, which is applied in the field of photosynthesis of carbon quantum dots and its preparation, can solve the problems of large differences in properties between carbon quantum dots and precursors, the inability to retain the excellent properties of the precursors, and the cumbersome preparation process, and achieve obvious excitation. Dependency, broadening design ideas, and the effect of simple operation

Active Publication Date: 2021-08-13
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such mainstream preparation methods often need to provide harsh environments such as high temperature or high pressure, and are limited by defects such as high energy consumption, high risk factor, cumbersome preparation process, and low yield, making it difficult to produce on a large scale
At the same time, the properties of carbon quantum dots and precursors obtained by traditional methods are quite different, and the excellent properties of precursors cannot be retained, so it is difficult to effectively control the performance of carbon quantum dots from the level of precursors

Method used

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  • Photoinduced carbon quantum dot and preparation method thereof
  • Photoinduced carbon quantum dot and preparation method thereof
  • Photoinduced carbon quantum dot and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 (synthesis of carbon quantum dot precursor)

[0033] (1) The synthesis of compound 2, the specific steps are as follows:

[0034] Sodium hydride (0.24 g, 10 mmol) and phenothiazine (1.99 g, 10 mmol) were added to a solution in dry DMF (20 mL); after stirring the solution at room temperature for 30 min, 4-fluorophenylsulfone (2.54 g , 10 mmol), then the mixture was stirred at 130 °C for 2 hours under a nitrogen atmosphere; after sufficient reaction, the mixture was poured into ice water (300 mL) to precipitate, and the precipitate was collected by filtration, and the precipitate was passed through column chromatography (DCM:PE = 3 : 1, v / v) was further purified to obtain a pale yellow solid (60% yield), which was designated as compound 2;

[0035] (2) The synthesis of compound 3, the specific steps are as follows:

[0036] Add 5-nitroindole (0.81 g, 5 mmol), potassium carbonate (7.90 g, 50 mmol) and compound 2 (2.17 g, 5 mmol) into a round bottom flask and...

Embodiment 2

[0037] Embodiment 2 (synthesis of carbon quantum dots)

[0038] Step (1) Dissolve 10 mg of compound 3 in chloroform solvent to prepare 2*10 -4 mol / L chloroform dilute solution.

[0039] Step (2) Place the beaker containing the solution under a 5W or higher ultraviolet light source, and the beaker is 10cm away from the ultraviolet light source.

[0040] Continue to light for 15 minutes at room temperature.

[0041] Step (3) The solution in the beaker was spin-dried, the spin-dried powder was washed and suction-filtered with petroleum ether, and the powder after the suction-filtration of the upper layer was dried in a vacuum oven for 24 hours to obtain carbon quantum dots.

[0042] In step (2), the change of the solution under ultraviolet light for 15 minutes is as follows: figure 1 Shown; at the same time, take the solutions in different time periods during the illumination process and put them into 3 mL cuvettes, and measure the changes of their absorption and emission spec...

Embodiment 3

[0046] A preparation method of photoinduced carbon quantum dots, the specific steps are the same as in Example 2, only the solution chloroform in step (1) is replaced by dichloromethane. The quantum dot particles thus obtained are uniformly dispersed, but the width of the ultraviolet absorption spectrum is relatively narrow.

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Abstract

The invention belongs to the technical field of nano materials, and particularly relates to a photoinduced carbon quantum dot and a preparation method thereof. Phenothiazine-diphenyl sulfone-indole is used as a carbon quantum dot precursor, and free radicals in a system can effectively oxidize a self-assembly body and carbonize the self-assembly body into carbon quantum dots with the size of 2-10 nm under continuous irradiation of ultraviolet light. The preparation method disclosed by the invention is simple to operate and mild in reaction, overcomes the defects of high pressure, high temperature and high energy consumption of traditional carbon quantum dots, and is high in yield and high in reproducibility. The prepared carbon quantum dot can effectively retain oxygen responsiveness, solvent dependence and other related properties of a precursor material, and also has unique properties of a carbon quantum dot material, such as excitation dependence of covering a full visible spectrum from blue light to red light, and these properties have unique advantages for developing novel optoelectronic devices, quantum dot probes and the like in the future.

Description

technical field [0001] The invention belongs to the technical field of nano-luminescent materials, and in particular relates to a photosynthetic carbon quantum dot and a preparation method thereof. Background technique [0002] Carbon quantum dots are a carbon-based zero-dimensional material. The particle size is generally between 2 and 100 nm. Compared with traditional dye molecules, carbon quantum dots have many advantages such as excellent optical properties, wide excitation spectrum and narrow emission spectrum, low toxicity, and excellent biocompatibility. . At present, the mainstream methods for preparing carbon quantum dots mainly focus on combustion method, hydrothermal synthesis method, microwave synthesis method and so on. Such mainstream preparation methods often need to provide harsh environments such as high temperature or high pressure, and are limited by defects such as high energy consumption, high risk factor, cumbersome preparation process, and low yield,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C07D417/12B82Y20/00B82Y40/00
CPCC09K11/65C07D417/12B82Y20/00B82Y40/00
Inventor 朱亮亮罗梦恺
Owner FUDAN UNIV
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