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Method for preparing hexagon star-shaped plumbous sulfide nanocrystalline

A technology of lead sulfide and nanocrystals, applied in the direction of lead sulfide, nanotechnology, nanotechnology, etc., can solve the problem of not preparing hexagonal star-shaped lead sulfide nanocrystals, and achieve low cost, low energy consumption, and low reaction temperature Effect

Inactive Publication Date: 2008-02-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are mainly the following methods for synthesizing PbS nanocrystals: sol-gel method [Parvathy N N, Rao V V and Pajonk GM.J.Cryst.Growth, 1997, 179, 249], microemulsion method [Schneider T, Haase M, Kornowski A, et al.Ber.Bunsenges.Phys.Chem, 1997, 101, 1654], sonochemical method [Shu Fen Wang, FengGu, Meng Kai Lu.Langmuir, 2006, 22, 398], etc., but none of the above methods prepared Hexagonal star-shaped lead sulfide nanocrystals
There is no report on the preparation of hexagonal star-shaped PbS nanocrystals using a simple method

Method used

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  • Method for preparing hexagon star-shaped plumbous sulfide nanocrystalline

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Experimental program
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Effect test

Embodiment 1

[0012] 1) Add 0.3g of cetyltrimethylammonium bromide to 90mL of deionized water at room temperature, stir fully on a magnetic stirrer to completely dissolve in water, and form a transparent solution;

[0013] 2) Add 0.55g of lead acetate and 0.33g of thiourea into the transparent solution, and continue to stir and mix evenly;

[0014] 3) Add the mixed solution into a polytetrafluoroethylene-lined hydrothermal reaction kettle, seal the reaction kettle, keep it warm at 160°C for 6 hours, open the reaction kettle after cooling to room temperature naturally, and wash with deionized water and absolute ethanol , and centrifuged to obtain a precipitate, which was dried at 50°C to obtain the final product.

[0015] Fig. 1 is the XRD diagram of the prepared product, it can be seen from the XRD diagram that the obtained product is lead sulfide with a face-centered cubic structure. Figure 2 is a transmission electron microscope image (TEM) and a scanning electron microscope image (SEM) ...

Embodiment 2

[0017] 1) Add 0.6g of cetyltrimethylammonium bromide to 90mL of deionized water at room temperature, stir fully on a magnetic stirrer to completely dissolve in water, and form a transparent solution;

[0018] 2) Add 0.55g of lead acetate and 0.22g of thiourea into the transparent solution, and continue to stir and mix evenly;

[0019] 3) Add the mixed solution into a polytetrafluoroethylene-lined hydrothermal reaction kettle, seal the reaction kettle, keep it warm at 120°C for 12 hours, open the reaction kettle after naturally cooling to room temperature, and wash with deionized water and absolute ethanol , after centrifugation and filtration, the precipitate was obtained, and the precipitate was dried at 50° C. to obtain hexagonal star-shaped lead sulfide nanocrystals.

Embodiment 3

[0021] 1) Add 1.2g of cetyltrimethylammonium bromide to 90mL of deionized water at room temperature, stir fully on a magnetic stirrer to completely dissolve in water, and form a transparent solution;

[0022] 2) Add 0.55g of lead acetate and 0.44g of thiourea into the transparent solution, and continue to stir and mix evenly;

[0023] 3) Add the mixed solution into a polytetrafluoroethylene-lined hydrothermal reaction kettle, seal the reaction kettle, keep it warm at 80°C for 24 hours, open the reaction kettle after naturally cooling to room temperature, and wash with deionized water and absolute ethanol , after centrifugation and filtration, the precipitate was obtained, and the precipitate was dried at 50° C. to obtain hexagonal star-shaped lead sulfide nanocrystals.

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Abstract

The invention discloses a method preparing hexagram PBS nanocrystal. The process is as follows: cetyltrimethylammonium bromide is added into deionized water, and stirred efficiently to dissolve completely in the water, and then the transparent solution is obtained; lead acetate and thiourea are added into the transparent solution, stirred uniformly, and then added to the hydrothermal reaction kettle; the solution which is in the hydrothermal reaction autoclave keeps the temperature in 80 DEG C to 160 DEG C about 6 to 24 hours; the reaction autoclave is opened until the temperature is reduced to the room temperature through the natural cooling; and the solution is washed by deionized water and absolute ethyl alcohol, centrifugally filtrated; the precipitate is dried, and then the final product is obtained. The invention has the advantages of easy preparation, low reaction temperature, less energy consumption and low cost. The invention is beneficial to industrial production.

Description

technical field [0001] The invention relates to a method for preparing hexagonal star-shaped lead sulfide nanocrystals. Background technique [0002] Lead sulfide (PbS) is an important semiconductor material with a narrow band gap (about 0.41 eV) and a large excitation Bohr radius (about 18 nm), so PbS is very suitable for studying the size confinement effect. The nanoscale PbS energy band shifts from the near-infrared blue to the visible region, exhibits singular optical and electrical properties, and has good third-order nonlinear optical properties. It has potential application prospects in photonic devices such as photonic switches. Lead sulfide has a relatively small bandwidth and has a certain absorption intensity in the infrared region, so PbS nanomaterials are also expected to be used in narrow-bandgap semiconductor devices that absorb and emit in the infrared (IR) or near-infrared (NIR) region. Therefore, the preparation and research of lead sulfide nanoparticles w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/21B82B3/00
Inventor 祝华云张孝彬糜裕宏
Owner ZHEJIANG UNIV
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