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Preparation method of fluorescently-enhanced graphene quantum dots

A graphene quantum dot and fluorescence enhancement technology, which is applied in the field of nanomaterials, can solve the problems of unstable luminescence and graphene quantum dot luminescence, and achieve the effects of improving luminescence stability, preventing fluorescence quenching, and increasing yield

Active Publication Date: 2018-11-02
NORTHWEST NORMAL UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a stable fluorescence-enhanced preparation method of graphene quantum dots for the problem of unstable luminescence of graphene quantum dots in the prior art, especially after high temperature and high pressure treatment.

Method used

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  • Preparation method of fluorescently-enhanced graphene quantum dots
  • Preparation method of fluorescently-enhanced graphene quantum dots
  • Preparation method of fluorescently-enhanced graphene quantum dots

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Disperse 5 mg of graphene quantum dots in 15 mL of water to form a graphene quantum dot solution (the final concentration of the graphene quantum dot luminescent body is 0.33 mg / mL), and use an ultrasonic cleaner to sonicate for 5 minutes; then transfer to a high-pressure reactor and heat to 180°C, react at a constant temperature for 12 hours, and cool to room temperature to obtain graphene quantum dots.

[0030] The fluorescence emission color of the graphene quantum dots is close to colorless under the irradiation of an ultraviolet lamp with a wavelength of 365nm; the fluorescence emission peak appears at 450nm when excited at a wavelength of 320nm.

Embodiment 2

[0032] Disperse 5 mg of graphene quantum dots in 14 mL of water to form a graphene quantum dot solution; take 1 mL of acetonitrile and add it to the graphene quantum dot solution, and use an ultrasonic cleaner to sonicate for 5 minutes; then transfer to an autoclave and heat to 180 °C , react at constant temperature for 12 hours, cool to room temperature, and obtain graphene quantum dots with enhanced fluorescence.

[0033] The fluorescence emission color of the graphene quantum dots under the irradiation of an ultraviolet lamp with a wavelength of 365nm is light yellow; the fluorescence emission peak appears at 450nm when excited at a wavelength of 320nm.

Embodiment 3

[0035] Disperse 5mg of graphene quantum dots in 13mL of water to form a graphene quantum dot solution; take 2mL of acetonitrile and add it to the graphene quantum dot solution, ultrasonic cleaner for 5min; then transfer to an autoclave, heat to 180°C, React at constant temperature for 12 hours, cool to room temperature, and obtain graphene quantum dots with enhanced fluorescence.

[0036] The fluorescence emission color of the graphene quantum dots under the irradiation of an ultraviolet lamp with a wavelength of 365nm is green; the fluorescence emission peak appears at 450nm when excited at a wavelength of 320nm.

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Abstract

The invention provides a preparation method of fluorescently-enhanced graphene quantum dots, the method is as follows: adding acetonitrile into a graphene quantum dot solution, performing ultrasonic cleaning in an ultrasonic cleaner for 5-10min, then transferring to a high-pressure reaction kettle, heating to 175-185 DEG C, reacting at constant temperature for 11 to 12h, and cooling to the room temperature to obtain fluorescent enhanced graphene quantum dots. According to the preparation method provided by the invention, acetonitrile is taken as the auxiliary intermediate to produce the fluorescence enhanced graphene quantum dots by one-step hydrothermal method, the luminescence stability is improved significantly with high luminescence intensity and quantum yield, at the same time, the fluorescence quenching of graphene quantum dots under the high temperature and high pressure environment is effectively prevented, and the application potential of the graphene quantum dots in the fields of photoelectric conversion, ion detection, sensor and the like is greatly expanded.

Description

technical field [0001] The invention relates to a method for preparing fluorescence-enhanced graphene quantum dots, belonging to the technical field of nanomaterials. Background technique [0002] Graphene quantum dots are quasi-zero-dimensional nanomaterials. Compared with semiconductor materials such as graphene, graphene quantum dots gradually reduce from the bulk phase to a certain size, and the characteristic size of the material is comparable to the de Broglie wavelength of electrons or the mean free path of electrons in three dimensions. Compared or smaller, the movement of electrons in the material is limited by three dimensions, that is to say, the energy of electrons is quantized in three dimensions, and graphene quantum dots reach the nanoscale in three dimensions, causing surface effects. At the same time, due to the special geometric size of graphene quantum dots, it also has other special properties, such as quantum size effect, dielectric confinement effect, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y40/00C01B32/194
CPCB82Y40/00C01P2002/80C01P2002/84C01P2004/04C09K11/65C01B32/194
Inventor 莫尊理张红娟郭瑞斌刘妮娟冯航空燕敏王瑞娟
Owner NORTHWEST NORMAL UNIVERSITY
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