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CdSe hollow nanosphere with adjustable size and preparation method thereof

A hollow nano-sized technology, applied in the field of nano-materials, can solve the problems of cumbersome preparation methods, difficult adjustment, and small size range, and achieve the effects of good monodispersity, low cost, and simple and easy preparation methods

Pending Publication Date: 2021-04-23
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the prior art that the size range of CdSe hollow nanospheres is small and difficult to adjust, and the preparation method is cumbersome, and to provide a size-adjustable CdSe hollow nanosphere and its preparation method

Method used

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  • CdSe hollow nanosphere with adjustable size and preparation method thereof
  • CdSe hollow nanosphere with adjustable size and preparation method thereof
  • CdSe hollow nanosphere with adjustable size and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] S1. Weigh Cd(AC) 2 , Se powder, respectively dissolved in benzyl alcohol, stirred for 30min, and then added PVP as the reaction starting solution, wherein the added Cd(AC) 2 , The molar ratio of Se powder and PVP is 3:3:40, Cd(AC) 2 The added concentration in benzyl alcohol is 0.15mM / 20mL. Pour the above solution into a polytetrafluoroethylene liner, then seal the reaction kettle, put the reaction kettle in an oven at 150°C, keep the reaction for 36h, and naturally cool to room temperature;

[0025] S2. Alternately washing the reaction product in step S1 with absolute ethanol and deionized water for 3 cycles to remove reaction residues to obtain CdSe hollow nanospheres.

[0026] Scanning electron microscopy of the prepared CdSe hollow nanospheres, the results are as follows figure 1 shown by figure 1 It can be seen that the prepared CdSe hollow nanospheres are monodisperse and uniform in particle size, with a particle size of 30 nm.

Embodiment 2

[0028] S1. Weigh Cd(AC) 2 , Se powder, respectively dissolved in benzyl alcohol, stirred for 30min, and then added PVP as the reaction starting solution, wherein the added Cd(AC) 2 , The molar ratio of Se powder and PVP is 3:3:40, Cd(AC) 2 The added concentration in benzyl alcohol is 0.3mM / 20mL, pour the above solution into a polytetrafluoroethylene liner, then seal the reaction kettle, put the reaction kettle in an oven at 150°C, keep the reaction for 36h, and cool down to room temperature naturally;

[0029] S2. Alternately washing the reaction product in step S1 with absolute ethanol and deionized water for 3 cycles to remove reaction residues to obtain CdSe hollow nanospheres.

[0030] Scanning electron microscopy of the prepared CdSe hollow nanospheres, the results are as follows figure 2 shown by figure 2 It can be seen that the prepared CdSe hollow nanospheres are monodisperse and uniform in particle size, with a particle size of 140 nm.

Embodiment 3

[0032] S1. Weigh Cd(AC) 2 , Se powder, respectively dissolved in benzyl alcohol, stirred for 30min, and then added PVP as the reaction starting solution, wherein the added Cd(AC) 2 , The molar ratio of Se powder and PVP is 3:3:40, Cd(AC) 2 The added concentration in benzyl alcohol is 0.45mM / 20mL, pour the above solution into a polytetrafluoroethylene liner, then seal the reaction kettle, put the reaction kettle in an oven at 150°C, keep the reaction for 36h, and naturally cool to room temperature;

[0033] S2. Alternately washing the reaction product in step S1 with absolute ethanol and deionized water for 3 cycles to remove reaction residues to obtain CdSe hollow nanospheres.

[0034] Scanning electron microscopy of the prepared CdSe hollow nanospheres, the results are as follows image 3 shown by image 3 It can be seen that the prepared CdSe hollow nanospheres are monodisperse and uniform in particle size, with a particle size of 350 nm.

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Abstract

The invention belongs to the field of nano materials, and particularly relates to a CdSe hollow nanosphere with an adjustable size and a preparation method thereof. A solvothermal method is adopted, benzyl alcohol is used as a solvent, a surfactant polyvinylpyrrolidone (PVP) is used as an additive, Cd(AC)2 is used as a cadmium source, Se powder is used as a selenium source, and the CdSe hollow nanospheres with the adjustable diameter ranging from 30 nm to 350 nm are prepared. Cd(AC)2 and Se powder are dissolved in benzyl alcohol to react to form small crystal grains with higher surface energy, and PVP is added to inhibit the generation speed of the small crystal grains, so that enough time is provided for aggregation and growth of the small crystal grains, and finally, based on the Kirkendall effect, hollow nanoparticle spheres with uniform size and good monodispersity are formed; in the preparation process, the size of the nanospheres can be adjusted and controlled by adjusting and controlling the concentration and temperature of reactants. The preparation method is simple and easy to implement, low in cost and good in repeatability.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to a CdSe hollow nanosphere with adjustable size and a preparation method thereof. Background technique [0002] CdSe is a II-VI group compound with special optical and photoelectric properties. CdSe nanomaterials have very important applications in the fields of solar cells, light-emitting diodes, and fluorescent biomarkers. At present, a variety of CdSe nanomaterials such as quantum dots, nanoparticles, hollow nanospheres, etc. have been prepared. Since the luminescent properties of CdSe nanomaterials are related to their size and shape, it is an important research direction to prepare CdSe nanomaterials with different luminescent properties by adjusting their shape and size. At present, CdSe quantum dots and CdSe nanoparticles with various sizes have been prepared to study the optical properties of CdSe nanomaterials with different sizes. [0003] Since CdSe hollow nanospher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04B82Y40/00
CPCC01B19/007B82Y40/00C01P2004/34C01P2004/45C01P2004/64C01P2004/62
Inventor 许少辉费广涛黄建勇
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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