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A preparation method of surface-modified colloidal silicon nanocrystals

A technology of surface modification and colloidal silicon, which is applied in the direction of nanotechnology, nanotechnology, and nanotechnology for materials and surface science. The effects of aggregation and surface oxidation, high quantum yield, and simple preparation process

Active Publication Date: 2019-07-02
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the size distribution of the prepared Si NCs is wide, resulting in problems such as wide luminescence band and low fluorescence efficiency.

Method used

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  • A preparation method of surface-modified colloidal silicon nanocrystals
  • A preparation method of surface-modified colloidal silicon nanocrystals
  • A preparation method of surface-modified colloidal silicon nanocrystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Weigh 5mg of 100nm nano-silica powder, put it in a sample bottle, add 5ml of n-hexene, put it into a magnetic stirrer, and put it on a magnetic stirrer.

[0037] 2) Liquid phase ablation by a titanium / sapphire laser (power: 810 mW, wavelength: 800 nm, irradiation duration: 100 fs, frequency: 80 MHz) for 3 h while magnetically stirring.

[0038] 3) The ablated sample was centrifuged at 11000 rpm for 15 min to obtain colloidal Si NCs.

[0039] The transmission electron microscope image of the colloidal Si NCs is shown in figure 1 (a) and image 3 As shown, the size distribution of the colloidal Si NCs is shown in figure 1 As shown in (b), the photoluminescence spectrum of the colloidal Si NCs under 360nm excitation light is as follows figure 2 As shown, the Fourier transform infrared spectrum of the colloidal Si NCs is shown in Figure 4 As shown, the fluorescence emission spectra of the colloidal Si NCs under different excitation light are as follows Figure 5 s...

Embodiment 2

[0041] 1) Weigh 10mg of 100nm nano-silica powder, put it in a sample bottle, add 5ml of toluene, put it into a magnetic stirrer, and put it on a magnetic stirrer.

[0042] 2) Liquid phase ablation by a titanium / sapphire laser (power: 810 mW, wavelength: 800 nm, irradiation duration: 100 fs, frequency: 80 MHz) for 3 h while magnetically stirring.

[0043] 3) The ablated sample was centrifuged at 11000 rpm for 15 min to obtain colloidal Si NCs.

[0044] The transmission electron microscope image of the colloidal Si NCs is shown in figure 1 As shown in (c), the size distribution of the colloidal Si NCs is as follows figure 1 (d) shown.

Embodiment 3

[0046] 1) Weigh 15mg of 100nm nano silicon powder, put it in a sample bottle, add 5ml of 1-octadecene, put it into a magnetic stirrer, and place it on a magnetic stirrer.

[0047] 2) Liquid phase ablation by a titanium / sapphire laser (power: 810 mW, wavelength: 800 nm, irradiation duration: 100 fs, frequency: 80 MHz) for 3 h while magnetically stirring.

[0048] 3) The ablated sample was centrifuged at 11000 rpm for 15 min to obtain colloidal Si NCs.

[0049] The transmission electron microscope image of the colloidal Si NCs is shown in figure 1 As shown in (e), the size distribution of the colloidal Si NCs is shown in figure 1 (f) shown.

[0050] Effect description

[0051] Combining the transmission electron microscope images, size distribution images, photoluminescence images and infrared spectra images of colloidal Si NCs prepared in the above examples, the feasibility and effect of the preparation method of the present invention are illustrated.

[0052] figure 1 (a), ...

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Abstract

The invention relates to a preparation method of a surface-modified colloidal state silicon nanocrystal. The preparation method comprises the following steps that (1) a mixed liquid of nanometer silicon powder and an organic solvent is subjected to laser cauterization treatment under the stirring state; (2) the mixed liquid after laser cauterization treatment is subjected to separation treatment, and the colloidal state silicon nanocrystal is obtained. The particle size distribution range of the colloidal state silicon nanocrystal prepared with the preparation method is controllable, the dispersity is good, no agglomeration occurs, and oxidation can be avoided.

Description

technical field [0001] The invention relates to the field of colloidal crystals, in particular to a method for preparing surface-modified colloidal silicon nanocrystals. [0002] technical background [0003] Si NCs (silicon nanocrystals) have been widely used in optoelectronic devices and bioluminescence labeling due to their spectral tunability and high photoluminescence efficiency. As one of the most abundant elements in nature, silicon is non-toxic and has broader research prospects than traditional semiconductor quantum dots. Its quantum structure has a quantum confinement effect, and stable photoluminescence can be obtained in the entire visible light range [Silicon quantum wire array fabrication by electrochemical and chemical dissolution of wafers, Applied Physics Letters, 1990, 57(10): 1046-1048]. Colloidal Si NCs have become a hot research topic due to their good dispersibility in solution, stable physical and chemical state, not easy to be oxidized, and good bioco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59C01B21/082B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B21/0828C01P2002/82C01P2004/04C01P2004/64C09K11/59
Inventor 吴文顺郝惠莲
Owner SHANGHAI UNIV OF ENG SCI
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