Method for preparing multielement non-metallic-element co-doped carbon quantum dots

A non-metallic element, carbon quantum dot technology, applied in the field of nano-luminescent material preparation, can solve the problems of inability to accurately control the lateral size and surface chemistry, low fluorescence quantum yield of synthetic methods, unclear light-emitting mechanism, etc., to achieve quantum production. rate improvement, size uniformity, and size-dependent effects

Inactive Publication Date: 2019-11-12
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current research on fluorescent C-Dots nanomaterials is still in its infancy, and there are still some urgent scientific research problems to be solved. For example, the yield and fluorescence quantum yield (QY) of existing synthesis methods are often relatively low, and it is impossible to accurately control its lateral direction. Size and surface chemistry, unclear luminescence mechanism, narrow fluorescence spectral range, etc.

Method used

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  • Method for preparing multielement non-metallic-element co-doped carbon quantum dots
  • Method for preparing multielement non-metallic-element co-doped carbon quantum dots
  • Method for preparing multielement non-metallic-element co-doped carbon quantum dots

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Embodiment 1

[0021] (1) Pretreatment of cassia seed shell powder: In the reactor, add 3.0mol / L hydrochloric acid solution: 80 mL, ammonium persulfate: 6g, dissolve, then add cassia seed shell powder: 14g, soak at room temperature for 8 hours, and then boil After cooling for 30 minutes, wash with deionized water until neutral, separate the solid and liquid, then wash with deionized water until neutral, and dry to obtain pretreated cassia husk powder;

[0022] (2) Preparation of crude multivariate non-metallic elements co-doped carbon quantum dots: In the reaction kettle, add 1-ethyl-2,3-dimethylimidazolium hexafluorophosphonium salt: 34g, 1-ethyl- 3-methylimidazole tetrafluoroborate: 34g, 1-ethyl-3-methylimidazolium bistrifluoromethanesulfonimide salt: 17g, pretreated cassia seed shell powder: 15g, stir evenly, and cover with a sealing cap , placed in an incubator at a constant temperature of 140±2°C, and reacted for 19 hours to obtain a light yellow viscous transparent liquid, which is car...

Embodiment 2

[0025] (1) Pretreatment of cassia seed shell powder: In the reactor, add 3.0mol / L hydrochloric acid solution: 79 mL, ammonium persulfate: 5g, dissolve, then add cassia seed shell powder: 16g, soak at room temperature for 8h, and then boil After cooling for 30 minutes, wash with deionized water until neutral, separate the solid and liquid, then wash with deionized water until neutral, and dry to obtain pretreated cassia husk powder;

[0026] (2) Preparation of crude multivariate non-metallic elements co-doped carbon quantum dots: In the reaction kettle, add 1-ethyl-2,3-dimethylimidazolium hexafluorophosphonium salt: 35g, 1-ethyl- 3-methylimidazole tetrafluoroborate: 36g, 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt: 19g, pretreated cassia seed shell powder: 10g, stir evenly, and cover with a sealing cap , placed in an incubator at a constant temperature of 140±2°C, and reacted for 18 hours to obtain a light yellow viscous transparent liquid, which is carbon qua...

Embodiment 3

[0029] (1) Pretreatment of cassia seed shell powder: In the reactor, add 3.0mol / L hydrochloric acid solution: 81 mL, ammonium persulfate: 4g, dissolve, then add cassia seed shell powder: 15g, soak at room temperature for 8 hours, and then boil After cooling for 30 minutes, wash with deionized water until neutral, separate the solid and liquid, then wash with deionized water until neutral, and dry to obtain pretreated cassia husk powder;

[0030] (2) Preparation of crude multivariate non-metallic elements co-doped carbon quantum dots: In the reaction kettle, add 1-ethyl-2,3-dimethylimidazolium hexafluorophosphonium salt: 37g, 1-ethyl- 3-methylimidazole tetrafluoroborate: 35g, 1-ethyl-3-methylimidazolium bistrifluoromethanesulfonimide salt: 15g, pretreated cassia seed shell powder: 10g, stir evenly, and cover with a sealing cap , placed in an incubator at a constant temperature of 140±2°C, and reacted for 20 hours to obtain a light yellow viscous transparent liquid, which is car...

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Abstract

The invention discloses a method for preparing multielement non-metallic-element co-doped carbon quantum dots. The method is characterized in that: cassia seed shells are pretreated by using hydrochloric acid and an ammonium persulfate solution; 30-38% of 1-ethyl-2,3-dimethylimidazolium hexafluorophosphate, 30-38% of 1-ethyl-3-methylimidazolium tetrafluoroborate, 15-19% of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and 10-15% of pretreated cassia seed shell powder in a reaction kettle are treated at a constant temperature of 140 + / - 2 DEG C to obtain light-yellow viscous transparent liquid; and the carbon quantum dots are prepared through dialysis purification. The method is green and simple to operate, and the carbon quantum dots have high fluorescence stability, smalland uniform sizes, good biocompatibility, and other characteristics without the need of secondary modification. The quantum yield of sulfur-phosphorus codoped carbon quantum dots is 36.12%.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano-luminescent materials, in particular to a preparation method and application of multi-element non-metallic element co-doped carbon quantum dots. Background technique [0002] As an emerging nanomaterial, carbon quantum dots (C-Dots) have the advantages of good biocompatibility, non-toxicity, small particle size, adjustable emission spectrum, high fluorescence stability and photobleaching resistance, and the raw materials are cheap. And the characteristics of rich sources, easy preparation and modification make its preparation and application become one of the hot research fields of analytical chemistry in recent years. However, the current research on fluorescent C-Dots nanomaterials is still in its infancy, and there are still some urgent scientific research problems to be solved. For example, the yield and fluorescence quantum yield (QY) of existing synthesis methods are often relati...

Claims

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Application Information

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IPC IPC(8): C09K11/70B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/70
Inventor 李慧芝翟玉博
Owner UNIV OF JINAN
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