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Quantum dots and preparation method thereof

A technology of quantum dots and mass ratio, applied in the field of quantum dots and its preparation, can solve the problems of uneven particle size, high cost, and narrow particle size distribution of quantum dots, and achieve the effect of crushing effect, high efficiency and low cost

Pending Publication Date: 2020-05-29
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a quantum dot and its preparation method. The preparation method is a top-down preparation method, which effectively solves the problem of quantum dots in the prior art through the design of the process route. The dot preparation process is complicated, the cost is high, it is difficult to achieve large-scale production, and the obtained quantum dots have uneven particle sizes, and finally obtain quantum dots with narrow particle size distribution and high purity.

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  • Quantum dots and preparation method thereof
  • Quantum dots and preparation method thereof

Examples

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Embodiment 1

[0071] This embodiment provides a method for preparing ZnS quantum dots, the specific steps are as follows:

[0072] (1) Mix 1g of ZnS bulk material, 10g of sodium chloride and 10g of agate balls (0.5mm in diameter), ball mill for 0.5h, then separate the agate balls by sieving, and wash the sample repeatedly with deionized water until passing X X-ray photoelectron spectrometer (ESCALAB250Xi) can not detect the existence of chlorine element and sodium element, then dry, obtain crude product;

[0073] (2) Mix the crude product obtained in step (1) with water to obtain a mixed solution with a crude product concentration of 1 mg / mL, and ultrasonicate the mixed solution for 120 h at a power of 50 W; carry out vacuum filtration on the sample after ultrasonic, The aqueous dispersion of the ZnS quantum dots was obtained by passing through a filter membrane with a pore size of 0.02 μm.

[0074] Test the surface morphology of the raw material ZnS bulk material used in this embodiment b...

Embodiment 2

[0077] This embodiment provides a method for preparing FeS quantum dots, the specific steps are as follows:

[0078] (1) Mix 1g of FeS bulk material, 10g of sodium chloride and 10g of agate balls, ball mill for 0.5h, then separate the agate balls by sieving, and wash the sample repeatedly with deionized water until passing through an X-ray photoelectron spectrometer ( ESCALAB250Xi) can not detect the existence of chlorine element and sodium element, dry afterwards, obtain crude product;

[0079] (2) Mix the crude product obtained in step (1) with water to obtain a mixed solution with a crude product concentration of 1 mg / mL, and ultrasonicate the mixed solution for 120 h at a power of 50 W; carry out vacuum filtration on the sample after ultrasonic, The aqueous dispersion of FeS quantum dots was obtained by passing through a filter membrane with a pore size of 0.02 μm.

[0080] The optical picture of the water dispersion liquid of the FeS quantum dot that the present embodime...

Embodiment 3

[0082] This embodiment provides a method for preparing Ag quantum dots, the specific steps are as follows:

[0083] (1) Mix 100mg of Ag bulk material, 10g of silica (400nm in particle size) and 10g of zirconia balls (0.5mm in diameter), ball mill for 0.5h, and then separate the zirconia balls by sieving to obtain crude product.

[0084] (2) Mix the crude product obtained in step (1) with N-methylpyrrolidone (NMP) to obtain a mixed solution with a crude product concentration of 5 mg / mL, and ultrasonicate the mixed solution for 120 h at a power of 50 W; The sample was vacuum filtered and passed through a filter membrane with a pore size of 0.02 μm to obtain the NMP dispersion of the Ag quantum dots.

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Abstract

The invention provides quantum dots and a preparation method thereof. The preparation method comprises the following steps: (1) mixing a body material, a grinding aid material and a ball milling ball,and carrying out ball milling to obtain a crude product; and (2) mixing the crude product obtained in the step (1) with a solvent to obtain a mixed solution, and carrying out ultrasonic treatment onthe mixed solution to obtain the quantum dots. The preparation method is a top-down preparation strategy, a macro-scale body material is used as a raw material, the body material is effectively crushed through the synergistic combination of two physical methods of ball milling and ultrasonic treatment, and finally, the nano-scale quantum dots with uniform particle size are obtained. The preparation method has the advantages of being efficient, environmentally friendly, easy to operate, low in cost and the like, is suitable for large-scale production and has good application prospects, the prepared quantum dots are high in purity, good in dispersity, high in yield, uniform in particle size and controllable in size, and the preparation method has important guiding significance in achieving industrial application and accelerating the industrial process of the quantum dots.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a quantum dot and a preparation method thereof. Background technique [0002] Quantum dots are quasi-zero-dimensional nanomaterials. Since their discovery in 1981, they have attracted widespread attention from the academic community. When the size of the material is smaller than its excitonic Bohr radius (usually the particle size is smaller than 20nm), the electronic structure will undergo a significant transition, manifested as quantum size effect and quantum confinement effect. Compared with their bulk materials, quantum dots have significantly different optical and electrical properties, making them suitable for a wide range of applications in solar cells, light-emitting diodes, biomedicine, lasers, sensing, and displays. [0003] The current methods for preparing quantum dots are mainly divided into bottom-up method and top-down method. The bottom-u...

Claims

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Application Information

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IPC IPC(8): C09K11/56C09K11/58C09K11/60C09K11/06C01G49/12C01G9/08B82Y20/00B82Y40/00
CPCC09K11/565C09K11/602C09K11/58C09K11/06B82Y20/00B82Y40/00C01G9/08C01G49/12C09K2211/14C01P2004/03C01P2004/04C01P2004/64C01P2004/61
Inventor 张勇王卫彪陈哲学徐元清梁程
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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