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Preparation method and application of water-phase room-temperature phosphorescent carbon dot material

A room-temperature phosphorescence and carbon dot technology, which is applied to luminescent materials, material analysis and application through optical means, can solve the problems of disappearance, easy sedimentation of carbon dot material particle size, and inability to effectively disperse, and achieve low cost and raw material Inexpensive, easy-to-operate effects

Active Publication Date: 2020-08-11
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It should be noted that the currently prepared carbon dot materials with room temperature phosphorescence properties are basically in the solid state, and have the following defects: (1) when the carbon dot materials are dispersed in water, the room temperature phosphorescence properties will be reduced with the collapse of the crystalline salt matrix. (2) The particle size of the carbon dot material is too large to easily settle in the water phase and cannot be effectively dispersed; thus limiting the application of the phosphorescent carbon dot material in the water phase

Method used

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  • Preparation method and application of water-phase room-temperature phosphorescent carbon dot material
  • Preparation method and application of water-phase room-temperature phosphorescent carbon dot material
  • Preparation method and application of water-phase room-temperature phosphorescent carbon dot material

Examples

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Effect test

Embodiment 1

[0045] Weigh 2g potassium nitrate (melting temperature 350℃), 0.2g magnesium chloride, 0.1g potassium dihydrogen phosphate and 0.05g carbon source 1,2,4-triaminobenzene and place them in a sample bottle, add 20ml distilled water , Stir fully for 10 minutes to obtain a uniform solution, then vacuum freeze-dry, and obtain a uniform mixed powder after grinding. Place the powder in a crucible, heat it up to 400°C at a heating rate of 10°C in a muffle furnace, and keep it at 400°C for 4 hours, then cool to room temperature, and wash with ultrapure water 3 times to remove molten salt After the substrate is dried in an oven, a carbon dot material with room temperature phosphorescence is obtained.

[0046] The morphology and structural composition of carbon dot composites were analyzed by powder X-ray diffractometer and transmission electron microscope. The result is figure 1 As shown, the XRD pattern of the carbon dot composite material shows that there may be three main components in ...

Embodiment 2

[0050] Weigh 2g of sodium nitrate (melting temperature 320℃), 0.2g of barium chloride, 0.1g of potassium dihydrogen phosphate and 0.05g of carbon source 1,2,4-triaminobenzene and place them in the sample bottle, add 20ml of distilled water, fully stirred for 10min to obtain a uniform solution, then vacuum freeze-drying, and grinding to obtain a uniform mixed powder. Place the powder in a crucible, heat it up to 350°C at a heating rate of 10°C in a muffle furnace, and keep it at 350°C for 5 hours, then cool to room temperature, wash with ultrapure water 3 times to remove molten salt After the substrate is dried in an oven, a carbon dot material with room temperature phosphorescence is obtained. The result is Picture 12 As shown, the best emission of fluorescence of the prepared material in the water phase is 498nm, and the best emission of phosphorescence is 517nm (the best excitation wavelength is 400nm). It is a white powder under a fluorescent lamp. Under a 365nm ultraviole...

Embodiment 3

[0053] Weigh 2g of potassium nitrate (melting temperature 350℃), 0.2g of strontium chloride and 0.05g of carbon source 1,2,4-triaminobenzene, place in a sample bottle, add 20ml of distilled water, and fully stir for 10min to obtain uniformity The solution is then vacuum freeze-dried, and a uniform mixed powder is obtained after grinding. Place the powder in a crucible, heat it up to 400°C at a heating rate of 10°C in a muffle furnace, and keep it at 400°C for 4 hours, then cool to room temperature, and wash with ultrapure water 3 times to remove molten salt After the substrate is dried in an oven, a carbon dot material with room temperature phosphorescence is obtained. The result is Figure 13 As shown, the best emission of fluorescence of the prepared material is 372nm, and the best emission of phosphorescence is 509nm (the best excitation wavelength is 365nm). It is a light yellow powder under a fluorescent lamp. Under a 365nm ultraviolet lamp, the obtained powder exhibits b...

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Abstract

The invention discloses a preparation method and application of a water-phase room-temperature phosphorescent carbon dot material, and belongs to the field of preparation of functional luminescent carbon materials. The preparation method comprises the following steps: mixing a carbon source, a molten salt matrix, alkaline-earth metal salt and hydrogen phosphate for carbonization, cooling to room temperature after carbonization, and washing to remove the molten salt matrix of the prepared material, thereby obtaining the room-temperature phosphorescent carbon dot material with the water dispersion property. According to the method, the problems that an existing carbon dot phosphorescent material cannot be applied to a water phase, the service life is short and the preparation method is complex are effectively solved, and a large batch of room-temperature phosphorescent materials capable of being applied to the water phase can be simply manufactured.

Description

Technical field [0001] The invention belongs to the field of functional luminescent carbon material manufacturing, and relates to a preparation method and application of an aqueous phase room temperature phosphorescent carbon dot material. Background technique [0002] Room temperature phosphorescent materials have unique characteristics such as large Stokes shift, long-lived triplet excited state, effective elimination of self-absorption and background fluorescence. Room temperature phosphorescent materials can usually display a lifetime of several seconds to several hours after the excitation source is removed. This unique property is expected to be widely used in information security, optoelectronic devices, sensing and high-sensitivity biological imaging. Early research on room temperature phosphorescent materials usually focused on heavy metal-based inorganics or organic compounds, but due to the toxic effects of heavy metals, potential environmental hazards and expensive sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/02B82Y20/00B82Y30/00C09D11/50C09D11/03G01N21/64G01K11/00
CPCB82Y20/00B82Y30/00C09D11/03C09D11/50C09K11/025C09K11/65G01K11/00G01N21/6428
Inventor 王婵宋启军陈月月徐雅兰贺静
Owner JIANGNAN UNIV
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