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Carbon dot with high thermal stability and preparation method thereof

A technology with high thermal stability and carbon dots, applied in chemical instruments and methods, nano-carbon, climate sustainability, etc., can solve the problem of low thermal stability of carbon dots, achieve high carbonization degree, high thermal stability, high heat The effect of stability

Active Publication Date: 2020-06-05
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, there are few studies on the thermal stability of carbon dots, and the main method is to coat a layer of protective material (such as BaSO 4 and SiO 2 etc.) to improve its thermal stability (Zhou D, Zhai Y, Qu S, et al. small , 2017, 13(6): 1602055.; Liu K K, Zhou R, Liang Y C, et al. Science China Materials , 2018, 61(9): 1191-1200.)

Method used

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  • Carbon dot with high thermal stability and preparation method thereof
  • Carbon dot with high thermal stability and preparation method thereof
  • Carbon dot with high thermal stability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 0.2000g of citric acid and 0.2558g of 2,7-dihydroxynaphthalene, add them into 40mL of deionized water, place them in a 59KHz high-frequency ultrasonic cleaner, and process them ultrasonically for 10 minutes at room temperature to obtain a reaction solution.

[0036] The above reaction solution was placed in a 100 mL stainless steel autoclave lined with tetrafluoroethylene, and hydrothermally reacted in an oven at 200°C for 14 hours. After the reaction, cool to room temperature, take out the reaction solution, filter through a 0.22 μm microporous membrane to remove large particle reaction products, and obtain an aqueous solution of yellow fluorescent carbon dots.

[0037] At -79°C, the yellow fluorescent carbon dot aqueous solution was frozen into a solid, and the deionized water was removed by freeze-drying to obtain yellow fluorescent carbon dot powder.

[0038] Weigh 0.2g of yellow fluorescent carbon dot powder into a corundum crucible, put it into a tube furnac...

Embodiment 2

[0051] Weigh 0.02g of the green fluorescent carbon dot prepared in Example 1, dissolve it in 10mL of ethyl acetate, add 2g of polymethyl methacrylate, heat and dissolve at 50°C, pour it into a polytetrafluoroethylene mold, and let it cool naturally at room temperature. The ethyl acetate was evaporated to dryness to obtain a green fluorescent carbon dot film with green light emission.

[0052] The white light LD device was assembled with the green fluorescent carbon dot film prepared above and the laser diode, and the luminous performance of the white light LD device was investigated. The results are as follows: Figure 5 .

[0053] Figure 5 (a) shows the fluorescence emission spectra of the above-mentioned green fluorescent carbon dot film at different excitation wavelengths. When the excitation wavelength is 400nm, the fluorescence intensity of the film is the highest.

[0054] Figure 5 (b) is the physical picture of the assembled white light LD device. Since laser diod...

Embodiment 3

[0057] Weigh 0.2000g of citric acid and 0.5116g of 2,7-dihydroxynaphthalene, add them into 40mL of deionized water, place them in a 59KHz high-frequency ultrasonic cleaner, and process them ultrasonically for 10 minutes at room temperature to obtain a reaction solution.

[0058] The above reaction solution was placed in a 100 mL stainless steel autoclave lined with tetrafluoroethylene, and hydrothermally reacted in an oven at 200°C for 10 h. After the reaction, cool to room temperature, take out the reaction solution, filter through a 0.22 μm microporous membrane to remove large particle reaction products, and obtain an aqueous solution of yellow fluorescent carbon dots.

[0059] At -79°C, the yellow fluorescent carbon dot aqueous solution was frozen into a solid, and the deionized water was removed by freeze-drying to obtain yellow fluorescent carbon dot powder.

[0060] Figure 6 The fluorescence spectra of the yellow fluorescent carbon dot aqueous solution prepared above u...

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Abstract

The invention relates to a carbon dot with high thermal stability and a preparation method thereof, which comprises the following steps: by taking 2,7-dihydroxynaphthalene and citric acid as carbon sources and water as a solvent, preparing yellow fluorescent carbon dots by adopting a hydrothermal method, heating to 200-400 DEG C in the inert environment, and performing annealing treatment, therebyobtaining the green fluorescent carbon dots. The carbon dot prepared by the invention emits green fluorescence under the excitation of ultraviolet exciting light, has high thermal stability, can bearthe high temperature of 250 DEG C, and can be used as light conversion fluorescent powder to be applied to the preparation of a laser diode light-emitting device.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and relates to a carbon-based nanometer material, in particular to a carbon dot with high thermal stability and a preparation method of the carbon dot. Background technique [0002] Carbon dots are carbon-based nanomaterials with a particle size of less than 10nm, mainly composed of C, H, O, N and other elements, and the surface is rich in functional groups such as hydroxyl, carboxyl and amino groups. Carbon dots have low toxicity, a wide range of raw materials, good biocompatibility, and excellent fluorescence properties. Therefore, carbon dots have become the focus of attention in recent years and have been widely used in many fields such as ion detection, bioimaging, photocatalysis, and lighting. [0003] Currently, the solid-state light sources used in lighting are mainly Light Emitting Diodes (LEDs), and LED devices are mainly composed of LED chips and light-converting phospho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C01B32/15
CPCB82Y20/00B82Y40/00C01P2004/04C01P2004/64C09K11/65C01B32/15Y02B20/00
Inventor 杨永珍刘兴华郑静霞刘旭光许并社
Owner TAIYUAN UNIV OF TECH
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