Preparation method of sodium-doped coal-based yellow fluorescent carbon dots

Yellow fluorescent carbon dots were prepared by sodium doping and hydrocavitation technology, which solved the problem of short-wavelength fluorescence concentration in coal-based carbon dots, achieving a breakthrough in biocompatibility and industrial application, and meeting the industrialization needs of polychromatic carbon dots.

CN120865891BActive Publication Date: 2026-06-26CHINA UNIV OF MINING & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF MINING & TECH
Filing Date
2025-09-05
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

The fluorescence of existing coal-based carbon dots is mainly concentrated in the short-wavelength region, which leads to severe interference with biological tissues and photodamage, limiting their application potential in optoelectronic devices and bioimaging.

Method used

By employing sodium doping, and combining pretreatment with concentrated nitric acid, hydrogen peroxide, and sodium hydroxide with hydrocavitation technology, the cross-linking bonds of graphite microcrystals are broken while surface groups are retained, forming yellow fluorescent carbon dots.

Benefits of technology

It expands the fluorescence wavelength range of coal-based carbon dots, avoids damage to biological tissues caused by short-wave radiation, expands the color gamut, meets the needs of flexible quantum dot displays and warm white LED light sources, and the preparation method is environmentally friendly and low-cost, making it suitable for industrial production.

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Abstract

The application discloses a preparation method of sodium-doped coal-based yellow fluorescent carbon dots, and belongs to the technical field of coal-based carbon nanomaterials. The preparation method of the sodium-doped coal-based yellow fluorescent carbon dots comprises the following steps: adding bituminous coal into a mixed solution of concentrated nitric acid and hydrogen peroxide, adding sodium hydroxide after a first mixing reaction, adjusting the pH to neutral, and performing a second mixing reaction to obtain a coal sample; adding the coal sample into water to prepare a bituminous coal mixed solution, and then performing cavitation stripping treatment on the bituminous coal mixed solution to obtain the sodium-doped coal-based yellow fluorescent carbon dots. The coal-based carbon dots with yellow fluorescence are prepared, the bottleneck that the fluorescence of the coal-based carbon dots is generally blue is broken, the fluorescence wavelength of the coal-based carbon dots is prolonged, the damage of short-wave radiation to biological tissues is avoided, the color gamut range of the coal-based carbon dots is expanded, and the long-wave fluorescence demand of flexible quantum dot display, warm white LED light sources, full-spectrum catalysis and the like is met.
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