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A preparation method of zinc ion-doped yellow fluorescent carbon quantum dots

A technology of carbon quantum dots and yellow fluorescence, which is applied in the field of preparation of carbon quantum dots, can solve the problems of low quantum yield, single fluorescence color of carbon quantum dots, monotonic blue fluorescence, etc., and achieves high quantum yield and simple and easy method. effect of mild reaction conditions

Active Publication Date: 2017-10-24
NANJING TECH UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] However, the fluorescence color of carbon quantum dots prepared by most current methods is relatively single, and most of them are monotonous blue fluorescence.
Although yellow fluorescent carbon quantum dots have been reported (Li H, He X, Kang Z, et al. Water-Soluble Fluorescent Carbon Quantum Dots and Photocatalyst Design[J]. Angewandte Chemie International Edition, 2010,49(26):4430-4434. ), however, the quantum yield is relatively low (less than 20%), therefore, it is still a challenge to prepare yellow fluorescent carbon quantum dots with high quantum yield

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Embodiment 1

[0028] 1 Preparation of carbon quantum dots

[0029] Take 1 mmol of citric acid monohydrate (CA), 1 mmol of zinc chloride, 1 mmol of urea, and 10 ml of toluene in a 15 ml hydrothermal kettle, and set the hydrothermal condition at 200°C for 6 hours. After the reaction is completed, the carbon quantum dot solution is obtained by centrifugation, rotary evaporation, ultrasonic dispersion and dialysis. Measure main peak at 560nm through fluorescence spectrometer (as figure 2 Shown), the half peak width is about 100nm, measured by X-ray diffractometer, its spectrum (such as image 3 shown) shows a broad (002) peak at 2θ = 25°, which further proves the amorphous structure of white light-emitting carbon quantum dots. by transmission electron microscopy (e.g. figure 1 Shown) It can be seen that the carbon quantum dots are uniform in size and well dispersed. According to its size distribution diagram, we get that the average diameter of carbon quantum dots is 3.5nm. By confocal mi...

Embodiment 2

[0033] 1 Preparation of carbon quantum dots

[0034] Take 1mmol of citric acid monohydrate (CA), 1mmol of zinc nitrate, 2mmol of urea, and 10ml of toluene in a 15ml hydrothermal kettle, and set the hydrothermal condition at 200°C for 12h. After the reaction is completed, the carbon quantum dot solution is obtained by centrifugation, rotary evaporation, ultrasonic dispersion and dialysis. Measured by fluorescence spectrometer, the main peak is at 580nm, and the half-peak width is about 80nm. Measured by X-ray diffractometer, its spectrogram shows that there is a very wide (002) peak at 2θ=25°, which further proves the carbon quantum dots. Amorphous structure. It can be seen from the transmission electron microscope that the carbon quantum dots are uniform in size and well dispersed. According to its size distribution diagram, we obtained that the average diameter of white light carbon quantum dots is 3nm. Its fluorescence lifetime can be calculated to be 6.5 ns by shooting c...

Embodiment 3

[0038] 1 Preparation of carbon quantum dots

[0039] Take 1mmol of citric acid monohydrate (CA), 3mmol of zinc chloride, 2mmol of urea, and 10ml of N,N-dimethylformamide in a 15ml hydrothermal kettle, and set the hydrothermal condition at 250°C for 7 hours. After the reaction is completed, the carbon quantum dot solution is obtained by centrifugation, rotary evaporation, ultrasonic dispersion and dialysis. Measure the main peak at 580nm by fluorescence spectrometer, and the half-maximum width is about 75nm. Measure by X-ray diffractometer, its spectrum shows that there is a very wide (002) peak at 2θ=25 °, which further proves the carbon quantum dots. Amorphous structure. It can be seen from the transmission electron microscope that the carbon quantum dots are uniform in size and well dispersed. According to its size distribution diagram, we get that the average diameter of carbon quantum dots is 3.4nm. Its fluorescence lifetime can be calculated to be 6.8ns by photographin...

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Abstract

The invention relates to a preparation method for a zinc ion-doped yellow fluorescent carbon quantum dot. The preparation method comprises the following specific steps: placing a zinc source, a carbon source, a passivator and an organic solvent in a hydrothermal kettle, placing the hydrothermal kettle into a drying oven and heating for reaction; stopping heating after completion of reaction, cooling and taking out a solution in the hydrothermal kettle; centrifuging, taking supernatant, and carrying out rotary evaporation or drying so as to obtain solid powder, and after the solid powder is dissolved in water in an ultrasonic manner, dialyzing through a dialysis membrane so as to obtain a quantum dot aqueous solution. The characteristics that the reaction conditions are mild and the method is simple and easy to implement are realized. The prepared yellow fluorescent carbon quantum dot with high strength can stably emit yellow fluorescence and the quantum yield is high.

Description

technical field [0001] The invention relates to a method for preparing fluorescent nanometer materials, in particular to a method for preparing zinc ion-doped yellow fluorescent carbon quantum dots. Background technique [0002] Carbon nanomaterials have undergone rapid progress in the past decades and have become one of the most promising materials that have changed and will continue to change human life. Carbon quantum dots have attracted extensive attention due to their low toxicity, photostability, and good biocompatibility. Based on the excellent characteristics of carbon quantum dots, they can be applied in photoelectric sensing and biomedicine. Carbon quantum dots not only have excellent performance, but also can be prepared in various and simple ways, and the raw materials required for the preparation are cheap and easy to obtain. [0003] However, the fluorescence color of carbon quantum dots prepared by most current methods is relatively single, and most of them ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y30/00B82Y20/00C09D11/30
Inventor 陈苏程剑张艳
Owner NANJING TECH UNIV
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