Preparation method of nitrogen-doped fluorescent carbon dots

A technology of fluorescent carbon dots and nitrogen doping, applied in the field of preparation of nitrogen doped fluorescent carbon dots, can solve the problems of low product yield, uncontrollable size, and poor crystallinity of carbon dots

Active Publication Date: 2016-05-18
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method generally has a high fluorescence quantum yield of carbon dots, and the preparation process is eas

Method used

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  • Preparation method of nitrogen-doped fluorescent carbon dots
  • Preparation method of nitrogen-doped fluorescent carbon dots
  • Preparation method of nitrogen-doped fluorescent carbon dots

Examples

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Example Embodiment

[0018] Example 1

[0019] The anthracite is crushed and ground, sieved with a 200-mesh screen, dried in an oven at 100°C for 5 hours, cooled to room temperature, 504mg of the anthracite dried in the oven is weighed and placed in a 50ml beaker, and then 20ml of dimethylformamide is added , Stir thoroughly, uniformly disperse the carbon source and ultrasonic for 1.2h, then place the mixture in a 50ml hydrothermal kettle and react hydrothermally at 180℃ for 12h; after the above reaction, wait until the hydrothermal kettle is cooled to room temperature, and the suspension is taken out After centrifugation at 9000 rpm for 20 minutes in a high-speed benchtop centrifuge, take the supernatant to obtain a hydrosol of fluorescent carbon dots; then place the hydrosol of fluorescent carbon dots in a rotary steaming device to remove organic solvents to obtain a powder Fluorescent carbon dots. Using the fluorescent dye quinine sulfate as a reference, the quantum yield of the prepared fluoresc...

Example Embodiment

[0020] Example 2

[0021] Grind the graphite powder, sieving with a 200-mesh screen, and dry it in an oven at 110°C for 5 hours. After cooling to room temperature, weigh 504mg of the graphite powder dried in the oven and place it in a 50ml beaker, and add 20ml of dimethylformaldehyde. Stir thoroughly, disperse the carbon source uniformly and sonicate for 1.2h, then place the mixture in a 50ml hydrothermal kettle and react hydrothermally at 180℃ for 12h; after the above reaction, wait for the hydrothermal kettle to cool to room temperature and take out the suspension After centrifugation in a high-speed bench top centrifuge at 9000 rpm for 18 minutes, the supernatant was taken to obtain a hydrosol of fluorescent carbon dots; then the hydrosol of fluorescent carbon dots was placed in a rotary steaming device to remove organic solvents to obtain a powder Fluorescent carbon dots. The resulting particle size distribution is as figure 2 Shown.

Example Embodiment

[0022] Example 3

[0023] The bituminous coal is crushed and ground, sieved with a 200-mesh screen, dried in an oven at 105°C for 6 hours, after cooling to room temperature, 200mg of the bituminous coal dried in the oven is weighed and placed in a 50ml beaker, and then 10ml of dimethylformamide is added , Fully stir, uniformly disperse the carbon source and sonicate for 0.8h, then place the mixture in a 50ml hydrothermal kettle, and hydrothermally react at 80℃ for 10h; after the above reaction, wait for the hydrothermal kettle to cool to room temperature, and take the suspension out After centrifugation in a high-speed desktop centrifuge at 8500 rpm for 10 minutes, the supernatant was taken to obtain a hydrosol of fluorescent carbon dots; then the hydrosol of fluorescent carbon dots was placed in a rotary steaming device to remove the organic solvent to obtain a powdered fluorescent Carbon point.

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Abstract

The invention relates to the technical field of preparation of carbon nanomaterials and provides a preparation method of nitrogen-doped fluorescent carbon dots. The preparation method comprises the following steps: 1, a carbon source is broken, ground, sieved by a 200-mesh sieve and dried in an oven; 2, the carbon source dried by the oven is weighed and placed into a 50-ml beaker, then an organic solvent is added, and a mixture is stirred sufficiently and subjected to ultrasonic processing for 0.8-1.2 h; 3, the mixture prepared in the step 2 is placed in a 50-ml hydrothermal kettle to have a hydrothermal reaction for 2-12 h, and the temperature is controlled at 60-180 DEG C; 4, after step 3, a suspension is taken out and placed into a high-speed desk centrifuge, supernatant liquor is taken out after 10-20 min of centrifugation, and hydrosol of the fluorescent carbon dots is obtained; 5, the hydrosol, obtained in the step 4, of the fluorescent carbon dots is placed in rotary evaporation equipment, the organic solvent is removed, and the target product fluorescent carbon dots are prepared. The preparation method of the nitrogen-doped fluorescent carbon dots has the characteristics of green and environment-friendly reaction conditions, easiness in control and easiness in mass production and preparation and is expected to be widely applied to the fields of photoelectric devices, bio-imaging, detection, sensing and the like.

Description

technical field [0001] The invention relates to a method for preparing nitrogen-doped fluorescent carbon dots, and belongs to the technical field of carbon nanomaterial preparation. Background technique [0002] Carbon dots are fluorescent carbon particles composed of single-layer or few-layer graphene sheets with a particle size of less than 20 nm. It was first obtained from the lysate of carbon nanotubes by the University of South Carolina in 2004. extracted by-products. Studies have found that carbon dots have attracted widespread attention due to their excellent properties such as excellent fluorescence characteristics, good biocompatibility, low toxicity, good photostability, and no light flickering phenomenon. Fields such as sensing show great application potential. [0003] At present, the preparation methods of carbon dots are mainly divided into two categories: 1) "top-down" method, which generally uses harsh chemical reactions, such as arc discharge, laser ablati...

Claims

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Application Information

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IPC IPC(8): C09K11/65C01B31/02B82Y20/00B82Y40/00
CPCC09K11/0883C09K11/65
Inventor 邱介山李明宇于畅胡超王秀娜王玉伟
Owner DALIAN UNIV OF TECH
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