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Preparation of two kinds of carbon quantum dots with different luminescent properties by "one pot" method

A technology of carbon quantum dots and properties, applied in the field of preparation of carbon-based nanomaterials, can solve problems such as complex synthesis process and difficult synthesis conditions

Active Publication Date: 2017-03-08
上海鼎弈材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, many preparation methods of carbon dots have been developed, but there are still some limitations or disadvantages: such as the need for more expensive precursors in the synthesis process, some synthesis conditions are difficult, the synthesis process is complex, large Some methods still need further surface modification or functionalization for the synthesized carbon dots to make them emit light.

Method used

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  • Preparation of two kinds of carbon quantum dots with different luminescent properties by "one pot" method
  • Preparation of two kinds of carbon quantum dots with different luminescent properties by "one pot" method
  • Preparation of two kinds of carbon quantum dots with different luminescent properties by "one pot" method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] With the help of the hydrothermal synthesis and post-treatment of LEV-type magnesium-doped aluminum phosphate molecular sieve, two different fluorescent carbon dots were prepared by the "one-pot" method.

[0037] Dissolve 0.187g pseudo-boehmite in 7mL water, continue to add 0.164g magnesium acetate, 0.35mL phosphoric acid and 0.4mL azamethylpiperidine under magnetic stirring, and continue stirring for 1 hour. Transfer the obtained gel into a stainless steel reaction kettle lined with polytetrafluoroethylene, place the reaction kettle in an oven at 180°C, and heat and react for 3 days under the pressure naturally generated by the reaction kettle;

[0038] After the reaction is completed, the reaction kettle is taken out and placed at room temperature for natural cooling; the brown-yellow supernatant in the kettle is recovered (to obtain soluble carbon quantum dots CND-1). Purification of carbon quantum dots CND-1: Filter out insoluble substances with a 0.22 micron filter, and...

Embodiment 2

[0043] With the help of the hydrothermal synthesis and post-treatment of AFI-type aluminum phosphate molecular sieve, two different fluorescent carbon dots were prepared by the "one-pot" method.

[0044] Dissolve 0.575 g phosphoric acid in 7 mL water, add 0.42 g boehmite CATAPAL B and 0.56 mL triethylamine under magnetic stirring, and continue stirring for 1 hour. Transfer the obtained gel into a stainless steel reaction kettle lined with polytetrafluoroethylene, place the reaction kettle in an oven at 200°C, and heat and react for 1 day under the autogenous pressure of the reaction kettle;

[0045] After the reaction is completed, the reaction kettle is taken out and placed at room temperature for natural cooling; the milky white supernatant in the kettle is recovered (to obtain soluble carbon quantum dot CND-1). Purification of carbon quantum dots CND-1: filter out the insoluble matter with a 0.22 micron filter, and dialyze the filtrate with a dialysis bag with a molecular weight...

Embodiment 3

[0050] With the help of the hydrothermal synthesis and post-treatment of CHA-type silicon-doped aluminum phosphate molecular sieve, two different fluorescent carbon dots were prepared by the "one-pot" method.

[0051] Disperse 1.02g of ground aluminum isopropoxide in 2.1g of tetraethylammonium hydroxide aqueous solution, magnetically stir until it is completely dissolved, add 0.69g of phosphoric acid dropwise, continue stirring for 2 hours, and then slowly add 0.25g of silica sol, continue Stir for 1 hour. Transfer the obtained gel into a stainless steel reaction kettle lined with polytetrafluoroethylene, place the reaction kettle in a 170°C oven, and heat the reaction kettle for 5 days under autogenous pressure;

[0052] After the reaction is completed, the reaction kettle is taken out and placed at room temperature for natural cooling; the supernatant in the kettle is recovered (to obtain soluble carbon quantum dots CND-1). Purification of carbon quantum dots CND-1: filter out i...

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Abstract

The invention provides a one-pot method for preparing two carbon quantum dots different in illuminant property, belonging to the technical field of preparation of carbon-based nanomaterials. According to the method, by virtue of hydro-thermal synthesis of a molecular sieve and by controlling synthesis and post-treatment conditions, carbon quantum dots having two illuminant behaviors, namely dependent on excitation wavelength and independent from excitation wavelength, can be obtained. Reaction waste liquid is used for preparing a soluble carbon quantum dot CND-1, thereby changing waste into things of value, protecting the environment and saving resources; the size distribution of the carbon quantum dot CND-1 is between 3nm and 20nm, and the illuminant range is between 350nm and 500nm; a molecular sieve-compounded carbon quantum dot prepared by calcining molecular sieve crystals has an illuminant range of 450-580nm; a carbon quantum dot CND-2 prepared by etching a molecular sieve framework has a size range of 2-10nm and has an illuminant range of 380-600nm. The two carbon quantum dots prepared by the one-pot method are adjustable in size, and have excellent fluorescence property and biocompatibility; and the solid powder samples of the two carbon quantum dots can be stored for a long time, and the obtained liquid samples can be used directly after being dissolved.

Description

Technical field [0001] The invention belongs to the technical field of the preparation of carbon-based nanomaterials, and specifically relates to a "one-pot" preparation of two carbon quantum dots with different luminescence properties by means of molecular sieve synthesis and calcination technology. Background technique [0002] Carbon quantum dots (referred to as carbon dots) are dispersed, spherical-like nanoparticles with a size of less than 20 nm, and are a new type of carbon-based nanomaterial discovered in recent years. As a new member of the carbon nanomaterial family, carbon dots not only exhibit excellent fluorescence properties such as strong fluorescence stability, photobleaching resistance, no light scintillation phenomenon, and adjustable emission wavelength, but also have low toxicity, good biocompatibility, and low The characteristics of small molecular weight and particle size have shown potential application value in the fields of biomarkers, optoelectronic devi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00B82Y40/00
Inventor 李激扬沐影王艳艳于吉红
Owner 上海鼎弈材料科技有限公司
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