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A light-tunable room temperature phosphorescent carbon dot material and its preparation method and application

A technology of room temperature phosphorescence and carbon dots, which is applied in the direction of luminescent materials, fluorescence/phosphorescence, and material analysis through optical means. It can solve the problems of cumbersome experimental steps, single material form, and long cycle, and achieve simple operation steps and cheap raw materials. , the effect of a wide range of sources

Active Publication Date: 2020-12-29
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have some shortcomings that need to be solved urgently: 1) The experimental steps are cumbersome, the cycle is long, and it is difficult to prepare in large quantities; 2) The properties of carbon dots greatly depend on the choice of solid matrix, and the material morphology is relatively single and difficult to control, mostly in the form of thin films Or massive, and the particle size is larger; 3) The color of phosphorescent carbon dots is mostly blue or green, lacking long-wavelength emitting phosphorescent carbon dots

Method used

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  • A light-tunable room temperature phosphorescent carbon dot material and its preparation method and application
  • A light-tunable room temperature phosphorescent carbon dot material and its preparation method and application
  • A light-tunable room temperature phosphorescent carbon dot material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0043] Weigh 7.5g of potassium nitrate and 2.5g of sodium chloride powder (melting temperature is 350°C) and place them in a sample bottle, add distilled water, stir well, then carry out vacuum freeze-drying, and obtain a uniform mixed salt system after grinding. Weigh 0.5g of 1,2,4-triaminobenzene, grind it with the mixed salt system, place it in a crucible, raise the temperature to 350°C in a muffle furnace at a rate of 10°C, and After keeping the temperature for 3 hours, the temperature was cooled to room temperature to obtain carbon dots with room temperature phosphorescence.

[0044] The scanning electron microscope image of the obtained powder is shown in figure 1As shown, the obtained material is oval or rod-shaped, with a size of about 50 nm. Disperse the powder in acetone and test it with a transmission electron microscope, the results are as follows figure 2 , indicating that carbon quantum dots with a diameter of about 2-3nm are dispersed in a molten salt matrix ...

Embodiment 2

[0048] Weigh 7.5g of potassium nitrate and 2.5g of sodium chloride powder (melting temperature is 350°C) and place them in a sample bottle, add distilled water, stir well, then carry out vacuum freeze-drying, and obtain a uniform mixed salt system after grinding. Weigh 0.5g of citric acid, grind it with the mixed salt system, place it in a crucible, and keep it at 350°C for 3 hours in a muffle furnace with a heating rate of 10°C. When the temperature is cooled to room temperature, it has Room-temperature phosphorescent carbon-based nanomaterials. The result is as Figure 8 As shown, the best fluorescence emission of the prepared material is at 477nm, and the best phosphorescence emission is at 557nm (the optimum excitation wavelength is 400nm). The powder is white under the fluorescent lamp. Under the 395nm ultraviolet lamp, the obtained powder shows green fluorescence. When the ultraviolet lamp is turned off, the phosphorescence of the powder changes from green to yellow.

Embodiment 3

[0050] Weigh 7.5g of potassium nitrate and 2.5g of sodium chloride powder (melting temperature is 350°C) and place them in a sample bottle, add distilled water, stir well, then carry out vacuum freeze-drying, and obtain a uniform mixed salt system after grinding. Weigh 0.5g of ethylenediaminetetraacetic acid, grind it with the mixed salt system, place it in a crucible, and keep it in a muffle furnace at 350°C for 3 hours at a heating rate of 10°C. When the temperature is cooled to room temperature, That is, a carbon-based nanomaterial with room temperature phosphorescence is obtained. The result is as Figure 9 As shown, the best fluorescence emission of the prepared material is at 432nm, and the best phosphorescence emission is at 516nm (the optimum excitation wavelength is 365nm). The powder is white under the fluorescent lamp. Under the 365nm ultraviolet lamp, the obtained powder shows blue fluorescence. When the ultraviolet lamp is turned off, the phosphorescence of the p...

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Abstract

The invention discloses a light-adjustable room-temperature phosphorescent carbon dot material, a preparation method and applications thereof, and belongs to the technical field of preparation of luminescent carbon nanometer materials. The method comprises the following steps: weighing different inorganic salt powder, putting into a sample bottle, adding distilled water, fully stirring, drying, and grinding to obtain a uniform mixed salt system; and grinding a carbon source and the mixed salt system, putting the grinded materials into a crucible, carrying out heat preservation at 140-400 DEG Cfor 2-6 hours at a heating rate of 8-12 DEG C, and cooling to room temperature to obtain the carbon-based nanometer material with room-temperature phosphorescence. According to the invention, the method effectively solves the problems of complex preparation method, expensive raw materials, high toxicity and short-wavelength phosphorescence emission of the existing phosphorescent material, and canbe used for simply preparing a large batch of room-temperature phosphorescent materials with light adjustability.

Description

technical field [0001] The invention belongs to the field of manufacturing functional luminescent carbon materials, and relates to a light-adjustable room-temperature phosphorescent carbon dot material and its preparation method and application, in particular to a simple and green molten salt method for preparing light-adjustable long-life carbon dots. Room temperature phosphorescent carbon dot materials and their applications in many fields. Background technique [0002] Phosphorescence, as a delayed form of luminescence, has the characteristics of long lifetime of the triplet excited state and large Scotos shift, which enables the analysis method based on phosphorescence to effectively eliminate the interference from the fluorescence of the cell itself and the background scattered light in the organism, and reduce the excitation. The coincidence with the emission spectrum and self-absorption phenomenon, thereby improving the accuracy and sensitivity of target detection. H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C09D11/50B42D25/36B42D25/378G01N21/64
CPCB82Y20/00B82Y40/00B42D25/36B42D25/378C09D11/50C09K11/65G01N21/6428
Inventor 王婵宋启军陈月月徐雅兰
Owner JIANGNAN UNIV
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