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Preparation method and application of an aqueous 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 ineffective dispersion and disappearance, and the particle size of carbon dot materials is prone to sedimentation, so as to achieve universal applicability , low cost and cheap raw materials

Active Publication Date: 2021-10-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 an aqueous room temperature phosphorescent carbon dot material
  • Preparation method and application of an aqueous room temperature phosphorescent carbon dot material
  • Preparation method and application of an aqueous room temperature phosphorescent carbon dot material

Examples

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Effect test

Embodiment 1

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

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

Embodiment 2

[0050] Weigh 2g of sodium nitrate (melting temperature is 320°C), 0.2g of barium chloride, 0.1g of potassium dihydrogen phosphate and 0.05g of carbon source 1,2,4-triaminobenzene in a sample bottle, add 20ml of distilled water, fully stirred for 10 minutes to obtain a uniform solution, then vacuum freeze-dried, and obtained a uniform mixed powder after grinding. Put the powder in a crucible, raise the temperature to 350°C at a rate of 10°C in a muffle furnace, and keep it at 350°C for 5 hours, then cool it down to room temperature, and wash it three times with ultrapure water to remove the molten salt After drying in an oven, the carbon dot material with room temperature phosphorescence can be obtained. The result is as Figure 12 As shown, the best fluorescence emission of the prepared material in the aqueous phase is at 498nm, and the best phosphorescence emission is at 517nm (the optimum excitation wavelength is 400nm). The powder is white under the fluorescent lamp. Unde...

Embodiment 3

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

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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 functional luminescent carbon material manufacturing. The present invention mixes carbon source, molten salt matrix, alkaline earth metal salt and hydrogen phosphate for carbonization, after carbonization, cools down to room temperature, washes and removes the molten salt matrix of the prepared material, and obtains room temperature phosphorescent carbon with water dispersion properties point material. The method of the invention effectively solves the problem that the existing carbon-dot phosphorescent materials cannot be used in the water phase, has a short lifespan and complicated preparation methods, and can simply produce large batches of room-temperature phosphorescent materials that can be used in the water phase.

Description

technical field [0001] The invention belongs to the field of manufacturing functional luminescent carbon materials, and relates to a preparation method and application of a water-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, and effective elimination of self-absorption and background fluorescence. Room-temperature phosphorescent materials typically exhibit lifetimes ranging from seconds to hours after the excitation source is removed, and this unique property is expected to find wide applications in information security, optoelectronic devices, sensing, and high-sensitivity bioimaging. Early studies on room-temperature phosphorescent materials usually focused on heavy metal-based inorganic or organic composites, but this approach has been severely limited due to the toxic effects of heavy metals as well...

Claims

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Application Information

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Patent Type & Authority Patents(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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