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Method for preparing photoluminescence carbon quantum dot

A carbon quantum dot and photoluminescence technology, applied in the fields of chemistry and nanomaterials science, can solve the problems of difficult large-scale production and promotion, cumbersome process steps, human health pollution, etc., and achieves easy promotion, simple preparation process equipment, and low cost. Effect

Active Publication Date: 2012-10-24
SANITARY EQUIP INST ACAD OF MILITARY MEDICAL SCI PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional semiconductor quantum dots are composed of highly toxic metal elements, so they have insurmountable defects, and human health and environmental pollution issues have always been of concern, thus limiting their wide application.
The method for preparing carbon quantum dots in the prior art, the prepared carbon quantum dots are mostly modified by carboxyl groups, the process steps are cumbersome, expensive process equipment is required, and the cost is high, the yield is low, and it is difficult to promote large-scale production

Method used

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  • Method for preparing photoluminescence carbon quantum dot
  • Method for preparing photoluminescence carbon quantum dot
  • Method for preparing photoluminescence carbon quantum dot

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The solid residue left after extracting soybean milk from soybeans is dried in an oven at 80°C to remove moisture, and then ground to a uniform bean dregs powder, which is evenly dispersed in a glass petri dish; the glass petri dish is placed in an electric heating drum with a power of 850W Heat the center of the tray in the air drying oven at a heating temperature of 200°C and a heating time of 20 minutes to obtain the crude product of carbon quantum dots; grind the crude product of carbon quantum dots and pass through a 200-mesh (200 mesh / square inch) sieve, Obtain a finer carbon quantum dot crude product powder; disperse the above carbon quantum dot crude product powder in a beaker filled with deionized water, stir vigorously with a glass rod, and let stand at room temperature (15-25°C) for 60 minutes. Then centrifuge at 4000rpm for 10min, retain the supernatant and place it in a rotary evaporator for evaporation to remove most of the water to obtain a concentrated so...

Embodiment 2

[0025] The solid residue left after extracting soybean milk from soybeans is dried in an oven at 80°C to remove moisture, and then ground to a uniform bean dregs powder, which is evenly dispersed in a glass petri dish; the glass petri dish is placed in an electric heating drum with a power of 850W Heat the center of the tray in the air drying oven at a heating temperature of 200°C and a heating time of 30 minutes to obtain the crude product of carbon quantum dots; grind the crude product of carbon quantum dots and sieve through a 200-mesh sieve to obtain finer carbon quantum dot crude products. Product powder: Disperse the above-mentioned carbon quantum dot crude product powder in a beaker filled with deionized water, stir vigorously with a glass rod, let stand at room temperature for 60min, then centrifuge at 4000rpm for 10min, keep the supernatant and place it in a spinner Evaporate in an evaporator to remove most of the water to obtain a concentrated solution, which is then ...

Embodiment 3

[0027] The solid residue left after extracting soybean milk from soybeans is dried in an oven at 80°C to remove moisture, and then ground to a uniform bean dregs powder, which is evenly dispersed in a glass petri dish; the glass petri dish is placed in an electric heating drum with a power of 850W Heat the center of the tray in the air drying oven at a heating temperature of 200°C and a heating time of 40 minutes to obtain the crude product of carbon quantum dots; grind the crude product of carbon quantum dots and sieve through a 200-mesh sieve to obtain finer carbon quantum dot crude products. Product powder: Disperse the above-mentioned carbon quantum dot crude product powder in a beaker filled with deionized water, stir vigorously with a glass rod, let stand at room temperature for 60min, then centrifuge at 4000rpm for 10min, keep the supernatant and place it in a spinner Evaporate in an evaporator to remove most of the water to obtain a concentrated solution, which is then ...

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Abstract

The invention discloses a method for preparing a photoluminescence carbon quantum dot. The method includes the following steps of drying and dehydrating a solid residue obtained after squeezing soybeans into soya-bean milk, placing the dried and dehydrated solid residue in an electrothermal blowing dry box to heat and carbonize to obtain a crude product of the carbon quantum dot, grinding the crude product of the carbon quantum dot, sieving, dispersing the sieved crude product of the carbon quantum dot in deionized water, uniformly stirring, still standing, centrifuging, evaporating an obtained aqueous solution containing the carbon quantum dot, and freeze drying to form a powdered shape to finally obtain the photoluminescence carbon quantum dot. According to the method for preparing the photoluminescence carbon quantum dot, a household bean juice maker is used for obtaining soybean dregs which serve as raw materials, the source of the raw materials is wide, the photoluminescence carbon quantum dot is prepared through low temperature heating and carbonization, the operation is simple, the cost is low, the yield is high, the preparation process equipment is simple and easy, the operation can be completed within an extremely short time, and the method is easy to popularize.

Description

technical field [0001] The invention relates to the fields of chemistry and nanometer material science, in particular to a method for preparing photoluminescent carbon quantum dots. Background technique [0002] Quantum dots (Quantum Dots, QDs), usually refers to semiconductor nanocrystals with a radius smaller than or close to the laser Bohr radius, and are nanometer-sized particles with unique optical and electrical properties. As a nano-fluorescent material, compared with traditional organic dye molecules, it has the advantages of strong photochemical stability, wide excitation spectrum, continuous distribution, and adjustable luminescent color. It is used in light-emitting devices, biomarkers, biodetections and biosensors fields have application value. However, traditional semiconductor quantum dots are composed of highly toxic metal elements, so they have insurmountable defects, and human health and environmental pollution issues have been of great concern, thus limiti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C09K11/65B82Y30/00C01B32/15
Inventor 刘长军田丰李钒杨建张彦军
Owner SANITARY EQUIP INST ACAD OF MILITARY MEDICAL SCI PLA
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