Method for preparing fluorescent carbon quantum dots by laser irradiation

A technology of carbon quantum dots and laser irradiation, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as pollution, complex preparation process, and low efficiency of quantum dots, achieve good controllability, and solve photoluminescence difficulties Effect

Active Publication Date: 2014-10-08
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

To sum up, the chemical method will pollute the environment during the preparation process, the arc discharge method is inefficient in preparing quantum dots, the microwave method and laser ablation method are convenient to manufacture but require a variety of reactants, and the preparation process is complicated.
In addition, whether the existing preparation methods are physical methods or chemical methods, in order to make the obtained carbon quantum dots have fluorescent properties, it is necessary to add surface modifiers to modify the quantum dots during the preparation process, which not only increases the complexity of the process performance, but also increases the cost

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  • Method for preparing fluorescent carbon quantum dots by laser irradiation
  • Method for preparing fluorescent carbon quantum dots by laser irradiation
  • Method for preparing fluorescent carbon quantum dots by laser irradiation

Examples

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Comparison scheme
Effect test

Embodiment 1

[0029] This example uses toluene as a carbon source to prepare fluorescent carbon quantum dots. For the preparation method, see figure 1 ,Specific steps are as follows:

[0030] (1) At room temperature, clean the quartz test tube 1 with ultrasonic waves, and after airtight drying, add 4ml of toluene as the carbon source 2, fill the test tube with argon protection and seal it;

[0031] (2) Select excimer laser 3 as ultraviolet light with a laser wavelength of 248nm, select single pulse power as 130mJ, select operating frequency as 5Hz, and irradiate in a non-focused manner for 10 minutes. See optical path 4. figure 1 The light yellow-green liquid in the resulting quartz test tube is the toluene solution of fluorescent carbon quantum dots;

[0032] Use the Japan Electronics JEM-2100F transmission electron microscope to scan the morphology of the fluorescent carbon quantum dots in this example, the results are as follows figure 2 As shown, it can be seen that most of the carbo...

Embodiment 2

[0036] In this example, benzene is used as a carbon source to prepare fluorescent carbon quantum dots. For the preparation method, see figure 1 ,Specific steps are as follows:

[0037] (1) At room temperature, clean the quartz test tube with ultrasonic waves, and after airtight drying, add 4ml of benzene, fill the test tube with argon protection and seal it;

[0038] (2) The laser wavelength of the excimer laser is selected to be ultraviolet light of 248nm, the single pulse power is selected to be 147mJ, the working frequency is selected to be 10Hz, and irradiated in a non-focused manner for 10 minutes;

[0039] (3) light yellow-green liquid in the gained quartz test tube is the benzene solution of fluorescent carbon quantum dots;

[0040] The morphology of the fluorescent carbon quantum dots in this example was scanned using Shanghai Aijian Nano AJ-I Scanning Tunneling Microscope (STM), and the results are as follows Figure 5 As shown, it can be seen that the particle size...

Embodiment 3

[0043] In this embodiment, solid dimethylnaphthalene was used as a carbon source to prepare a solution of dimethylnaphthalene in ethanol, wherein the mass concentration of dimethylnaphthalene was 5%, and ethanol was 95%, as the carbon source solution. Specific steps are as follows:

[0044] (1) At room temperature, the quartz test tube was cleaned by ultrasonic waves, after airtight drying, 4ml of carbon source solution was added, and the test tube was filled with argon gas for protection and then sealed;

[0045] (2) The laser wavelength of the excimer laser is selected to be ultraviolet light of 248nm, the single pulse power is selected to be 195mJ, the working frequency is selected to be 5Hz, and the irradiation is performed in a non-focused manner for 20 minutes;

[0046] (3) transparent liquid in the gained quartz test tube is the ethanol solution of fluorescent carbon quantum dots;

[0047] The experimental results show that the carbon quantum dots exhibit good fluoresc...

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Abstract

The invention discloses a method for preparing fluorescent carbon quantum dots by laser irradiation. The method is characterized in that one of benzene, substituted benzene and a compound containing multiple benzene rings is used as a carbon source; a liquid-state carbon source or a carbon source solution obtained by dissolving a solid-state carbon source into ethanol is irradiated for 1-120 minutes through ultraviolet light of which the wavelength is within 380nm to obtain the fluorescent carbon quantum dots. The carbon source and the solution thereof used by the method disclosed by the invention are simple, the selection of the carbon source is diverse; the laser power and the irradiation time adopted in the preparation process are good in controllability, the preparation process can be carried out at room temperature, the particle diameter of the obtained carbon quantum dots is 2-7nm, and the carbon quantum dots have a regular graphite structure; results show that the carbon quantum dots prepared by the method have photoluminescence fluorescence property without surface modification.

Description

technical field [0001] The invention belongs to quantum dot preparation technology, in particular to a method for preparing fluorescent carbon quantum dots by laser irradiation. Background technique [0002] Quantum dots (QDs) have received great attention and extensive research by researchers due to their special optical and electrical properties, and carbon quantum dots (CQDs) are an environmentally friendly nanometer with similar optical properties to semiconductor quantum dots. Fluorescent materials not only have the advantages of traditional semiconductors such as excellent optical properties and small size, but also have the advantages of good biocompatibility, low cytotoxicity, low preparation cost, mild reaction conditions, and easy large-scale synthesis and modification. , has shown great potential value in the fields of biosensing and medical imaging. Carbon quantum dots are a new class of nano-functional materials with a size below 10nm, which were discovered for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65
Inventor 蒋阳朱志峰王胜达张忠平蓝新正于永强张玉刚张彦
Owner HEFEI UNIV OF TECH
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