Nitrogen-and-sulfur-codoping-based graphene quantum dot material as well as preparation method and application thereof

A technology of graphene quantum dots, nitrogen and sulfur co-doping, applied in the field of fluorescent nanomaterials, graphene quantum dot materials, and its preparation, can solve the problem that the two-photon fluorescence properties of graphene quantum dots have not been significantly improved, and achieve the promotion of Application development, simple preparation method, and the effect of improving imaging depth

Active Publication Date: 2018-07-13
SHANGHAI UNIV
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  • 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 prog...

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  • Nitrogen-and-sulfur-codoping-based graphene quantum dot material as well as preparation method and application thereof
  • Nitrogen-and-sulfur-codoping-based graphene quantum dot material as well as preparation method and application thereof
  • Nitrogen-and-sulfur-codoping-based graphene quantum dot material as well as preparation method and application thereof

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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-and-sulfur-codoping-based graphene quantum dot material as well as a preparation method and application thereof. The method provided by the invention adopts a bottom-up preparation method to synthesize nitrogen and sulfur codoped graphene quantum dots by one step in an alkali aqueous solution of ammonium sulfite from small organic molecular 1,3,6-trinitropyrene.The method provided by the invention is simple in step as well as high in repeatability and yield. As the surfaces of the nitrogen and sulfur codoped graphene quantum dots contain more hydroxyl functional groups, amino functional groups and sulfonic functional groups, and the nitrogen and sulfur codoped graphene quantum dots are very easily dissolved into water and stably exit in an aqueous solution for a long time. For the graphene quantum dots provided by the invention, the two-photon fluorescence performance is remarkably improved, the imaging effect is further improved, and the imaging depth in biological tissues is further increased. As a two-photon fluorescence probe, the nitrogen and sulfur codoped graphene quantum dots prepared by the method provided by the invention has a very good two-photon fluorescence characteristic, can emit stronger fluorescence under the excitation of near-infrared wavelengths and can show a good imaging effect to the 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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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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