Method for preparing high-yield carbon quantum dots

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...

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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

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