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Nitrogen-sulfur co-doped graphene quantum dot material, its preparation method and application

A graphene quantum dot, nitrogen-sulfur co-doping technology, applied in the fields of its preparation, graphene quantum dot materials, and fluorescent nanomaterials, can solve the problem that the two-photon fluorescence properties of graphene quantum dots are not significantly improved, and achieve the promotion of The effect of application development, two-photon fluorescence performance improvement, and simple preparation method

Active Publication Date: 2021-08-10
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the synthesis methods and application research of graphene quantum dots have made rapid progress, the two-photon fluorescence properties of graphene quantum dots have not been significantly improved.

Method used

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  • Nitrogen-sulfur co-doped graphene quantum dot material, its preparation method and application
  • Nitrogen-sulfur co-doped graphene quantum dot material, its preparation method and application
  • Nitrogen-sulfur co-doped graphene quantum dot material, its preparation method and application

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Embodiment 1

[0026] In this example, see Figure 1 to Figure 5 , a nitrogen-sulfur co-doped graphene quantum dot material, the nitrogen-sulfur co-doped graphene quantum dots comprise nano-scale graphene nanosheets connected to hydroxyl, amino or sulfonic acid groups on edge carbon atoms layer; the average diameter of the nitrogen-sulfur co-doped graphene quantum dot is 3.0nm, and the average thickness is 1.35nm, and the nitrogen-sulfur co-doped graphene quantum dot contains C, N, O, S, H5 One element, nitrogen-sulfur co-doped graphene quantum dots consist of at least one layer of graphene nanosheets.

[0027] A kind of present embodiment is based on the preparation method of nitrogen-sulfur co-doped graphene quantum dot material, adopts molecular fusion method, comprises the steps:

[0028] a. With 1,3,6-trinitropyrene as a precursor, 0.05 g of 1,3,6-trinitropyrene was uniformly dispersed in 20 mL of water under ultrasonic conditions, and ultrasonic treatment was performed for 10 minutes ...

Embodiment 2

[0034] This embodiment is basically the same as Embodiment 1, especially in that:

[0035] In this embodiment, a method for preparing a nitrogen-sulfur co-doped graphene quantum dot material in this embodiment uses a molecular fusion method, including the following steps:

[0036] a. With 1,3,6-trinitropyrene as a precursor, 0.3g of 1,3,6-trinitropyrene was uniformly dispersed in 10mL of water under ultrasonic conditions, and ultrasonic treatment was performed for 10 minutes to prepare The concentration of 1,3,6-trinitropyrene was 30 mg / mL 1,3,6-trinitropyrene dispersion, and then 0.1 g of sub- Ammonium sulfate, continue to ultrasonically disperse the mixed solution for 10 minutes to obtain a reactant system solution fully mixed with 1,3,6-trinitropyrene and ammonium sulfite, and then transfer the reactant system solution to a polytetrafluoroethylene solution with a volume of 50mL In an ethylene high-pressure reactor, conduct a hydrothermal reaction at a temperature of 150°C ...

Embodiment 3

[0040] This embodiment is basically the same as the previous embodiment, and the special features are:

[0041] In this embodiment, a method for preparing a nitrogen-sulfur co-doped graphene quantum dot material in this embodiment uses a molecular fusion method, including the following steps:

[0042] a. With 1,3,6-trinitropyrene as a precursor, 1.0 g of 1,3,6-trinitropyrene was uniformly dispersed in 10 mL of water under ultrasonic conditions, and ultrasonic treatment was performed for 50 minutes to prepare 1,3,6-Trinitropyrene dispersion with 100mg / mL concentration of 1,3,6-Trinitropyrene, then add 5g of sulfurous acid to the 1,3,6-Trinitropyrene dispersion Ammonium, continue to ultrasonically disperse the mixed solution for 10 minutes to obtain a reactant system solution fully mixed with 1,3,6-trinitropyrene and ammonium sulfite, and then transfer the reactant system solution to a polytetrafluoroethylene solution with a volume of 50mL In a high-pressure reactor, carry out ...

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Abstract

The invention discloses a nitrogen-sulfur co-doped graphene quantum dot material, its preparation method and its application. The method of the invention adopts a bottom-up preparation method from small organic molecules 1,3,6-trinitropyrene , One-step synthesis of nitrogen-sulfur co-doped graphene quantum dots in alkaline aqueous solution of ammonium sulfite. The method of the invention has simple steps, high repeatability and high output. Since the surface of the prepared nitrogen-sulfur co-doped graphene quantum dots contains more functional groups of hydroxyl, amino and sulfonic acid groups, it is very soluble in water and exists stably in aqueous solution for a long time. The two-photon fluorescence performance of the graphene quantum dots of the present invention is significantly improved, and the imaging effect and the imaging depth in biological tissues are further improved. The nitrogen-sulfur co-doped graphene quantum dots prepared by the method of the present invention are used as two-photon fluorescent probes, which have It has good two-photon fluorescence characteristics, can emit strong fluorescence under near-infrared wavelength excitation, and can perform good imaging effects on biological tissues.

Description

technical field [0001] The present invention relates to a fluorescent nanomaterial, its preparation method and its application, in particular to a graphene quantum dot material, its preparation method and its application, which is applied to new graphene materials, two-photon fluorescent probes and biological cell imaging technology field. Background technique [0002] In general fluorescence phenomena, due to the low photon density of the excitation light, a fluorescent molecule can only absorb one photon at the same time, and then emit a fluorescent photon through a radiative transition. The two-photon fluorescence excitation process is that the ground-state fluorescent material absorbs two photons simultaneously and is excited to an excited state. In addition, two-photon excited fluorescence can be used in infrared or near-infrared light with less photodamage, such as 800nm ​​excitation light, for microscopic imaging of biological tissues. This process has deep penetrati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/65G01N21/6428G01N2021/6439
Inventor 王亮李伟涛李明吴明红潘登余
Owner SHANGHAI UNIV
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