Method for forming nitrogen and sulfur co-doped graphene quantum dots

A technology of graphene quantum dots and nitrogen sulfur, which is applied in the field of element-doped graphene quantum dots, can solve the problems of complex preparation process of carbon quantum dots, the chemical inertness of zinc sulfide limits the wide application of carbon quantum dots, etc.

Active Publication Date: 2015-07-29
BEIJING XINNA INT NEW MATERIALS TECH CO LTD
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Problems solved by technology

However, the preparation process of highly fluorescent ZnS-doped carbon quantum dots is complicated, and the poor chemical inertness of ZnS seriously limits the wide application of carbon quantum dots.

Method used

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  • Method for forming nitrogen and sulfur co-doped graphene quantum dots
  • Method for forming nitrogen and sulfur co-doped graphene quantum dots
  • Method for forming nitrogen and sulfur co-doped graphene quantum dots

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Embodiment

[0042] Nitrogen-sulfur co-doped graphene quantum dots (N,S-GQDs) were prepared by one-step hydrothermal treatment with citric acid (CA) and L-cysteine, in which citric acid was used as carbon source and L-cysteine ​​provided Doped nitrogen and sulfur. Compared with GQDs, due to the synergistic effect of doped nitrogen and sulfur atoms, the resulting nitrogen-sulfur co-doped graphene quantum dots have a fluorescence quantum yield (FLQY) as high as 73%, as well as excitation-independent characteristics.

[0043] Nitrogen-sulfur co-doped graphene quantum dots (N,S-GQDs) were prepared using citric acid and L-cysteine. The N,S-GQDs are prepared by thermal treatment of molecular organic salts of mixed carbon sources and surfactants in a single precursor. For preparation, citric acid monohydrate (2 g, 9.5 mol mmol) and L-cysteine ​​(1 g, 8.3 mol mmol) were dissolved in 5 mL of water, then evaporated at 70 °C and dried within 12 h. The obtained thick slurry was heated in a Teflon-li...

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Abstract

The invention relates to a method for forming graphene quantum dots, and in particular, to doped graphene quantum dots. The graphene quantum dots are co-doped with nitrogen and sulfur. The co-doped elements introduce a new type and high density of surface state of graphene quantum dots, leading to high yield and excitation-independent emission.

Description

technical field [0001] The invention relates to a method for preparing graphene quantum dots, in particular to an element-doped graphene quantum dot. The graphene quantum dots are co-doped with nitrogen and sulfur, and the above-mentioned co-doping elements introduce a new type and high-density surface state graphene quantum dots, so that the graphene quantum dots have high yield and excitation-independent characteristics. Background technique [0002] Quantum dots (QDs) are nanoparticles with size effect and optoelectronic properties, which are used in applications such as energy-saving displays and lighting tools, photovoltaic devices and biomarkers. Compared with other fluorescent (FL) materials (traditional dyes or polymers), quantum dots have many advantages, such as strong fluorescence, high photostability, and resistance to biological metabolic degradation. [0003] However, most high-performance quantum dots are limited by the toxicity of heavy metal elements such a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82Y40/00C01B31/04C09K11/06
CPCB82Y40/00B82Y30/00C01B31/0446C01B32/184
Inventor 于霆其他发明人请求不公开姓名
Owner BEIJING XINNA INT NEW MATERIALS TECH CO LTD
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