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Method for preparing high-yield carbon quantum dots

A carbon quantum dot, high-yield technology, which is applied in the field of carbon quantum dot preparation, can solve the problems of difficulty in realizing large-scale production promotion, low yield of carbon quantum dots, and cumbersome process steps, etc., and achieves a wide range of preparation temperature and high yield. And the effect of high quantum yield and simple process operation

Inactive Publication Date: 2012-12-12
SANITARY EQUIP INST ACAD OF MILITARY MEDICAL SCI PLA
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the above methods often require strict experimental conditions, expensive materials or instruments, and the process steps are cumbersome, the cost is high, and the yield of carbon quantum dots is very low.
Moreover, the carbon quantum dots synthesized by the above methods generally require further modification with strong acid or surface passivation agent to obtain certain fluorescence properties and solubility properties, so it is difficult to achieve large-scale production and promotion in a short time

Method used

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  • Method for preparing high-yield carbon quantum dots

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Effect test

Embodiment 1

[0026] A preparation method for high-yield carbon quantum dots, comprising the following steps:

[0027] (1) Put ammonium citrate with a mass of 0.5g into a muffle furnace, set the heating rate at 10°C / min to raise the temperature, and react at 150°C for 2.5h to obtain a cracked product;

[0028] (2) Grind the cracked product into powder, add 50ml of ethanol and stir for 6h, centrifuge at 4500rpm for 12min, remove insoluble matter, and obtain a brown ethanol solution containing carbon quantum dots;

[0029] (3) drying the ethanol solution containing carbon quantum dots to obtain carbon quantum dots. The yield is 17.5%, and the quantum yield is 26.1%;

Embodiment 2

[0031] A preparation method for high-yield carbon quantum dots, comprising the following steps:

[0032] (1) Put 0.5 g of ammonium dihydrogen citrate into a muffle furnace, set the heating rate at 10°C / min to raise the temperature, and react at 200°C for 4 hours to obtain the cracked product;

[0033] (2) Grind the lysed product into powder, add 50ml of ethanol and stir for 5h, centrifuge at 4000rpm for 15min, remove insoluble matter, and obtain a brown ethanol solution containing carbon quantum dots;

[0034] (3) drying the ethanol solution containing carbon quantum dots to obtain carbon quantum dots. The yield is 13.5%, and the quantum yield is 23.7%;

Embodiment 3

[0036] A preparation method for high-yield carbon quantum dots, comprising the following steps:

[0037] (1) Put ammonium citrate with a mass of 0.5g into a tubular electric furnace, set the heating rate at 50°C / min to raise the temperature, and react at 250°C for 2 hours to obtain a cracked product;

[0038] (2) Grind the cracked product into powder, add 50ml of ethanol and stir for 5h, centrifuge at 6000rpm for 10min, remove insoluble matter, and obtain a brown ethanol solution containing carbon quantum dots;

[0039] (3) drying the ethanol solution containing carbon quantum dots to obtain carbon quantum dots. The yield is 2.1%, and the quantum yield is 22.9%;

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Abstract

The invention discloses a method for preparing high-yield carbon quantum dots, which comprises the following steps that: (1) ammonium citrate is put into an electric heating furnace, the temperature rises at a heating rate of 5 to 50 DEG C / min, and the reaction is carried out for 2-4h at a temperature of 150 to 250 DEG C to obtain a pyrolysis product; (2) the pyrolysis product is milled into powder and added with ethanol to be stirred and centrifuged to remove insolubles to obtain a brown ethanol solution containing carbon quantum dots; and (3) the drying is carried out to obtain the carbon quantum dots. The process is simple to operate, the source of raw materials is wide, the cost of raw materials is low, the preparation conditions has low requirements and are relatively mild, the yield of obtained carbon quantum dots and the quantum yield are higher, the problems that the carbon quantum dots can not be produced on the scale and the fluorescence quantum yield of the obtained carbon quantum dots is low due to the limit of the process and the raw materials in the traditional preparation method of the carbon quantum dots can be solved, and the method can be applied to the fields such as biomarker, bio-imaging, a photovoltaic device, and a biosensor.

Description

technical field [0001] The invention relates to the technical field of carbon quantum dot preparation, in particular to a method for preparing high-yield carbon quantum dots. Background technique [0002] In 2004, researchers accidentally discovered carbon quantum dots in the process of purifying carbon nanotubes. Compared with traditional semiconductor quantum dots, carbon quantum dots have the following advantages: particle size is generally less than 10nm, stable photoluminescence performance, wide excitation wavelength range, emission wavelength dependent excitation wavelength characteristics, excellent biocompatibility and Non-toxic and environmental protection, etc. Therefore, carbon quantum dots are expected to replace semiconductor quantum dots and be used in the fields of biomarkers, bioimaging, optoelectronic devices, and biosensors, and are currently a research hotspot in the field of carbon nanomaterials. [0003] At present, there are many methods for preparin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65
Inventor 李钒刘长军田丰杨健张彦军杜振杰魏高峰
Owner SANITARY EQUIP INST ACAD OF MILITARY MEDICAL SCI PLA
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