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A 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 increase process complexity, and achieve good controllability and solve photoluminescence difficult effect

Active Publication Date: 2016-06-29
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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  • A method for preparing fluorescent carbon quantum dots by laser irradiation
  • A method for preparing fluorescent carbon quantum dots by laser irradiation
  • A method for preparing fluorescent carbon quantum dots by laser irradiation

Examples

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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, airtightly dry it, add 4 mL of toluene as carbon source 2, fill the test tube with argon gas for protection, and then 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 ca...

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, airtightly dry it, add 4 mL of benzene, fill the test tube with argon protection, and then 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, clean the quartz test tube with ultrasonic waves, airtightly dry it, add 4 mL of carbon source solution, fill the test tube with argon gas for protection, and then seal it;

[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 fluorescence effect without s...

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Abstract

The invention discloses a method for preparing fluorescent carbon quantum dots by laser irradiation, which is characterized in that: one of benzene, substituted benzene or polyphenylene ring compounds is used as a carbon source, and it is in a liquid state by being irradiated by ultraviolet light with a wavelength within 380nm Fluorescent carbon quantum dots can be obtained by irradiating a carbon source solution obtained by dissolving a solid carbon source in ethanol for 1 to 120 minutes. The carbon source and its solution used in the present invention are single, the choice of carbon source is diversified, the laser power and irradiation time used in the preparation process are well controllable, and it can be carried out at room temperature, and the obtained carbon quantum dots have a particle size of 2-7nm , has a regular graphite crystal structure, and the results show that the carbon quantum dots prepared by this method exhibit photoluminescent fluorescence characteristics 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 Patents(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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