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A preparation method of blue-green light carbon quantum dots with pH response

A blue-green light carbon quantum and reaction kettle technology is applied in the field of preparation of blue-green light carbon quantum dots, which can solve the problems of expensive raw materials, lengthy post-processing process, harsh reaction conditions, etc., to improve chemical and physical properties and significantly stimulate dependence The effect of sex, accurate and detailed data

Active Publication Date: 2021-01-15
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many methods for synthesizing carbon quantum dots, including arc discharge method, laser ablation method, electrochemical method, ultrasonic treatment method, pyrolysis method and microwave method; but most of these methods require expensive raw materials, high energy Consumption, harsh reaction conditions and lengthy post-treatment process, and the low fluorescence quantum yield of the obtained carbon quantum dots limit its large-scale application in the field of optoelectronics; The advantages of cheap raw materials and green environmental protection have been favored by researchers

Method used

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  • A preparation method of blue-green light carbon quantum dots with pH response
  • A preparation method of blue-green light carbon quantum dots with pH response
  • A preparation method of blue-green light carbon quantum dots with pH response

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preparation example Construction

[0064] The preparation of the blue-green light carbon quantum dot mixture is carried out in the reactor, which is completed under the state of heating and hydrothermal synthesis;

[0065] The heating furnace 1 is vertical, the upper part of the heating furnace 1 is the furnace cover 2, the lower part is the first electric control box 3, the inside of the heating furnace 1 is a furnace chamber 13, and the inner bottom of the furnace chamber 13 is provided with a first workbench 4, Place reactor 5 on first workbench 4, place polytetrafluoroethylene container 6 in reactor 5, be mixed solution 7 in polytetrafluoroethylene container 6, reactor 5 is sealed by reactor lid 14; The control box 3 is provided with a first display screen 8 , a first indicator light 9 , a first power switch 10 , a heating temperature controller 11 , and a heating time controller 12 .

[0066] figure 2 As shown, it is the vacuum freeze-drying state diagram of blue-green light carbon quantum dots. The posi...

Embodiment 1

[0077] Measurement of pH Responsiveness of Blue-Green Light Carbon Quantum Dots

[0078] (1) Prepare 10 mL of blue-green carbon quantum dot mixture solution with pH=7

[0079] Weigh 0.1g±0.0001g of blue-green light carbon quantum dots, measure 4mL±0.0001mL of deionized water, add it into a beaker, stir and mix for 5min to form a mixed solution; transfer the mixed solution to a volumetric flask, and deionized water respectively Rinse the beaker with 1mL for 3 times, add the rinse solution into the volumetric flask, and then use 3mL of deionized water to make up to the volume to form 10mL of blue-green carbon quantum dot mixture solution with pH=7;

[0080] (2) Prepare 25 mL of aqueous hydrochloric acid solution of 1 mol / L

[0081] Measure 2.08mL±0.0001mL of hydrochloric acid with a concentration of 37.5%, 6mL±0.0001mL of deionized water, add them into a beaker, stir and mix for 5min to form a mixed solution, move the mixed solution into a volumetric flask, and moisten with 5mL...

Embodiment 2

[0089] Measurement of Photobleaching Resistance of Blue-Green Light Carbon Quantum Dots under Different UV Light Irradiation Times

[0090] (1) Prepare 10mL of blue-green carbon quantum dot mixture solution of 10mg / mL

[0091] Weigh 0.01g±0.0001g of blue-green carbon quantum dots, measure 4mL±0.0001mL of deionized water, add it into a beaker, stir and mix for 5min to form a mixed solution, transfer the mixed solution to a volumetric flask, and use deionized water respectively Rinse the beaker with 1mL for 3 times, add the rinse solution into the volumetric flask, and then use 3mL of deionized water to make up to 10mL of 10mg / mL blue-green carbon quantum dot mixture;

[0092] (2) Take 3mL of 10mg / mL blue-green light carbon quantum dot mixture and place it in a light-transmitting cuvette, measure it with a fluorescence spectrometer, and obtain the original fluorescence spectrum;

[0093] (3) Put the cuvette into the three-purpose ultraviolet analyzer in the dark box, irradiate ...

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Abstract

The invention relates to a preparation method for a blue green light carbon quantum dot with pH response, which is specific to the conditions of low purity and fluorescence quenching under strong acid of the blue green light carbon quantum dot. The method comprises the following steps: by taking L-ascorbic acid as a carbon source, ammonium persulfate as an additive and deionized water as a solvent, performing hydrothermal airtight reaction, injection filtering, and dialysis, concentrating, freezing and carrying out vacuum freeze drying, thereby acquiring the blue green light carbon quantum dot with pH response. According to the preparation method, the process is advanced; the data is accurate and complete; the prepared product is brown powder; the purity is 99.8%; the particle diameter of the powder is less than or equal to 6.5nm; a strong emission peak exists at 464nm under the irradiation of 365nm exciting light; the blue green light is emitted; the chromaticity coordinate is that x is equal to 0.177 and y is equal to 0.223; the blue green light carbon quantum dot has obvious excitation dependency, pH responsibility and photo-bleaching resistance; the chemical and physical properties of the blue green light carbon quantum dot are greatly promoted; the method is an advanced method for preparing the blue green light carbon quantum dot with pH response.

Description

technical field [0001] The invention relates to a method for preparing blue-green light carbon quantum dots with pH response, and belongs to the technical field of preparation and application of nano carbon material carbon quantum dots. Background technique [0002] As a new member of the quantum dot family, carbon quantum dots have the advantages of tunable fluorescence, easy functionalization, good biocompatibility, and non-toxicity, and are widely used in cell imaging, biosensing, drug carriers, ion detection, and optoelectronics. device field. [0003] At present, there are many methods for synthesizing carbon quantum dots, including arc discharge method, laser ablation method, electrochemical method, ultrasonic treatment method, pyrolysis method and microwave method; but most of these methods require expensive raw materials, high energy Consumption, harsh reaction conditions and lengthy post-treatment process, and the low fluorescence quantum yield of the obtained carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 杨永珍王亚玲刘旭光王军丽郑静霞谢艳亭
Owner TAIYUAN UNIV OF TECH
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